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Racz FS, Farkas K, Stylianou O, Kaposzta Z, Czoch A, Mukli P, Csukly G, Eke A. Separating scale-free and oscillatory components of neural activity in schizophrenia. Brain Behav 2021; 11:e02047. [PMID: 33538105 PMCID: PMC8119820 DOI: 10.1002/brb3.2047] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 12/07/2020] [Accepted: 01/08/2021] [Indexed: 12/14/2022] Open
Abstract
INTRODUCTION Alterations in narrow-band spectral power of electroencephalography (EEG) recordings are commonly reported in patients with schizophrenia (SZ). It is well established however that electrophysiological signals comprise a broadband scale-free (or fractal) component generated by mechanisms different from those producing oscillatory neural activity. Despite this known feature, it has not yet been investigated if spectral abnormalities found in SZ could be attributed to scale-free or oscillatory brain function. METHODS In this study, we analyzed resting-state EEG recordings of 14 SZ patients and 14 healthy controls. Scale-free and oscillatory components of the power spectral density (PSD) were separated, and band-limited power (BLP) of the original (mixed) PSD, as well as its fractal and oscillatory components, was estimated in five frequency bands. The scaling property of the fractal component was characterized by its spectral exponent in two distinct frequency ranges (1-13 and 13-30 Hz). RESULTS Analysis of the mixed PSD revealed a decrease of BLP in the delta band in SZ over the central regions; however, this difference could be attributed almost exclusively to a shift of power toward higher frequencies in the fractal component. Broadband neural activity expressed a true bimodal nature in all except frontal regions. Furthermore, both low- and high-range spectral exponents exhibited a characteristic topology over the cortex in both groups. CONCLUSION Our results imply strong functional significance of scale-free neural activity in SZ and suggest that abnormalities in PSD may emerge from alterations of the fractal and not only the oscillatory components of neural activity.
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Affiliation(s)
| | - Kinga Farkas
- Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary
| | | | - Zalan Kaposzta
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Akos Czoch
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Peter Mukli
- Department of Physiology, Semmelweis University, Budapest, Hungary
| | - Gabor Csukly
- Department of Psychiatry and Psychotherapy, Semmelweis University, Budapest, Hungary
| | - Andras Eke
- Department of Physiology, Semmelweis University, Budapest, Hungary
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Rodríguez-Ferreiro J, Aguilera M, Davies R. Semantic priming and schizotypal personality: reassessing the link between thought disorder and enhanced spreading of semantic activation. PeerJ 2020; 8:e9511. [PMID: 32821532 PMCID: PMC7396150 DOI: 10.7717/peerj.9511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 06/18/2020] [Indexed: 01/26/2023] Open
Abstract
The term schizotypy refers to a group of stable personality traits with attributes similar to symptoms of schizophrenia, usually classified in terms of positive, negative or cognitive disorganization symptoms. The observation of increased spreading of semantic activation in individuals with schizotypal traits has led to the hypothesis that thought disorder, one of the characteristics of cognitive disorganization, stems from semantic disturbances. Nevertheless, it is still not clear under which specific circumstances (i.e., automatic or controlled processing, direct or indirect semantic relation) schizotypy affects semantic priming or whether it does affect it at all. We conducted two semantic priming studies with volunteers varying in schizotypy, one with directly related prime-target pairs and another with indirectly related pairs. Our participants completed a lexical decision task with related and unrelated pairs presented at short (250 ms) and long (750 ms) stimulus onset asynchronies (SOAs). Then, they responded to the brief versions of the Schizotypal Personality Questionnaire and the Oxford-Liverpool Inventory of Feelings and Experiences, both of which include measures of cognitive disorganization. Bayesian mixed-effects models indicated expected effects of SOA and semantic relatedness, as well as an interaction between relatedness and directness (greater priming effects for directly related pairs). Even though our analyses demonstrated good sensitivity, we observed no influence of cognitive disorganization over semantic priming. Our study provides no compelling evidence that schizotypal symptoms, specifically those associated with the cognitive disorganization dimension, are rooted in an increased spreading of semantic activation in priming tasks.
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Affiliation(s)
- Javier Rodríguez-Ferreiro
- Grup de Recerca en Cognició i Llenguatge, Departament de Cognició, Desenvolupament i Psicologia de l’Educació, Institut de Neurociències, Universitat de Barcelona, Barcelona, Spain
| | - Mari Aguilera
- Grup de Recerca en Cognició i Llenguatge, Departament de Cognició, Desenvolupament i Psicologia de l’Educació, Universitat de Barcelona, Barcelona, Spain
| | - Rob Davies
- Department of Psychology, Lancaster University, Lancaster, UK
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Comprehensive review: Computational modelling of schizophrenia. Neurosci Biobehav Rev 2017; 83:631-646. [PMID: 28867653 DOI: 10.1016/j.neubiorev.2017.08.022] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 07/08/2017] [Accepted: 08/30/2017] [Indexed: 12/21/2022]
Abstract
Computational modelling has been used to address: (1) the variety of symptoms observed in schizophrenia using abstract models of behavior (e.g. Bayesian models - top-down descriptive models of psychopathology); (2) the causes of these symptoms using biologically realistic models involving abnormal neuromodulation and/or receptor imbalance (e.g. connectionist and neural networks - bottom-up realistic models of neural processes). These different levels of analysis have been used to answer different questions (i.e. understanding behavioral vs. neurobiological anomalies) about the nature of the disorder. As such, these computational studies have mostly supported diverging hypotheses of schizophrenia's pathophysiology, resulting in a literature that is not always expanding coherently. Some of these hypotheses are however ripe for revision using novel empirical evidence. Here we present a review that first synthesizes the literature of computational modelling for schizophrenia and psychotic symptoms into categories supporting the dopamine, glutamate, GABA, dysconnection and Bayesian inference hypotheses respectively. Secondly, we compare model predictions against the accumulated empirical evidence and finally we identify specific hypotheses that have been left relatively under-investigated.
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Yang NB, Tian Q, Fan Y, Bo QJ, Zhang L, Li L, Wang CY. Deficits of perceived spatial separation induced prepulse inhibition in patients with schizophrenia: relationships to symptoms and neurocognition. BMC Psychiatry 2017; 17:135. [PMID: 28399842 PMCID: PMC5387250 DOI: 10.1186/s12888-017-1276-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 03/18/2017] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Prepulse inhibition (PPI) and attention were impaired, which may cause psychotic symptoms and (or) hinder the cognitive functions in schizophrenia. However, due to the measurement methods of PPI, findings about the relationship between PPI and clinical symptoms, cognitive performances have been equivocal. METHODS Seventy-five schizophrenia patients (SZ) and 50 healthy controls (HC) were assessed in a modified acoustic PPI paradigm, named perceived spatial separation-induced PPI (PSS-PPI), compared to perceived spatial co-location PPI (PSC-PPI) with inter-stimulus interval (ISI) of 120 ms. Repeatable Battery for the Assessment of Neuropsychological Status and the Stroop Color-Word Test were administered to all subjects. RESULTS Significant decrease in the modified PPI was found in the patients as compared to the controls, and effect sizes (Cohen'd) for patients vs. HCs % PPI levels achieved a significant level (PSC-PPI d = 0.84, PSS-PPI d = 1.27). A logistic regression model based on PSS-PPI significantly represented the diagnostic grouping (χ2= 29.3; p < 0 .001), with 85.2% area under ROC curve in predicting group membership. In addition, patients exhibited deficits in neurocognition. Among patients of "non-remission", after controlling for gender, age, education, duration, recurrence times, onset age, cigarettes per day and chlorpromazine equivalent dosage, PSS-PPI levels were associated with positive and negative symptoms, PANSS total and thought disorder (P1, P6, P7, N5, N7, G9). In multiple linear regression analyses, male and higher attention scores contributed to better PSC-PPI and PSS-PPI in controls group, while larger amount of smoke and longer word-color interfere time contributed to poor PSS-PPI. In patients' group, higher education and attention scores contributed to better PSS-PPI, while repeated relapse contributed to poor PSS-PPI. CONCLUSIONS The acoustic perceived spatial separation-induced PPIs may bring to light the psychopathological symptoms, especially for thought disorder, and the mechanism(s) of the novel PPI paradigm was associated with attention function.
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Affiliation(s)
- Ning-Bo Yang
- grid.24696.3fDepartment of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China
| | - Qing Tian
- grid.24696.3fDepartment of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China
| | - Yu Fan
- grid.24696.3fDepartment of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China
| | - Qi-Jing Bo
- grid.24696.3fDepartment of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China
| | - Liang Zhang
- grid.24696.3fDepartment of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China ,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088 China
| | - Liang Li
- grid.11135.37Department of Psychology, Peking University, Beijing, 100871 China ,grid.419897.aKey Laboratory on Machine Perception (Ministry of Education), Beijing, 100871 China ,McGovern Institute for Brain Research, Beijing, 100871 China
| | - Chuan-Yue Wang
- Department of Psychiatry, Beijing Anding Hospital, Capital Medical University, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088, China. .,Beijing Key Laboratory of Mental Disorders, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088, China. .,Beijing Institute for Brain Disorders Center of Schizophrenia, No.5 Ankang Lane, Dewai Avenue, Xicheng District, Beijing, 100088, China.
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Rinaldi R, Lefebvre L. Cued fluency protocol reveals dynamic symptomatic-dependent processes of goal-directed behaviours in schizophrenia. Cogn Neuropsychiatry 2016; 20:382-97. [PMID: 26084723 DOI: 10.1080/13546805.2015.1047013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Differential impairments of willed actions and routine behaviours are the subject of many studies into schizophrenia. These impairments in generating and controlling goal-directed behaviours are reported in studies showing the effect of cueing in cognitive or motor tasks in people with schizophrenia. The aim of this study was to assess the performance of people with schizophrenia in a cued fluency protocol reworked to fit the concept of goal-directed behaviour. The extent to which results could be better explained by goal-directed generation issues, according to a symptomatic framework, than by semantic retrieval or semantic processing impairments, was also investigated. METHODS We compared the performance of 43 individuals with schizophrenia to a control group of 26 participants. Participants were assessed with neuropsychological tests. The dominance of positive and negative symptoms, and apathetic profile, were also evaluated. All participants completed a cued fluency protocol. RESULTS Despite a significant improvement, not all people with schizophrenia exhibited equal cueing benefits. The participants with negative symptom dominance appeared to benefit more from cueing, even though their baseline performance was lower. CONCLUSIONS These results suggest that, in addition to semantic memory impairments, some cognitive tasks may be more broadly influenced by difficulties in generating goal-directed behaviours.
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Affiliation(s)
- Romina Rinaldi
- a Cognitive Psychology and Neuropsychology Department , UMONS Research Institute for Health Sciences and Technology, University of Mons , Mons , Belgium
| | - Laurent Lefebvre
- a Cognitive Psychology and Neuropsychology Department , UMONS Research Institute for Health Sciences and Technology, University of Mons , Mons , Belgium
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Greenwood TA, Light GA, Swerdlow NR, Calkins ME, Green MF, Gur RE, Gur RC, Lazzeroni LC, Nuechterlein KH, Olincy A, Radant AD, Seidman LJ, Siever LJ, Silverman JM, Stone WS, Sugar CA, Tsuang DW, Tsuang MT, Turetsky BI, Freedman R, Braff DL. Gating Deficit Heritability and Correlation With Increased Clinical Severity in Schizophrenia Patients With Positive Family History. Am J Psychiatry 2016; 173:385-91. [PMID: 26441157 PMCID: PMC4933520 DOI: 10.1176/appi.ajp.2015.15050605] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE The Consortium on the Genetics of Schizophrenia Family Study evaluated 12 primary and other supplementary neurocognitive and neurophysiological endophenotypes in schizophrenia probands and their families. Previous analyses of prepulse inhibition (PPI) and P50 gating measures in this sample revealed heritability estimates that were lower than expected based on earlier family studies. Here the authors investigated whether gating measures were more heritable in multiply affected families with a positive family history compared with families with only a single affected proband (singleton). METHOD A total of 296 nuclear families consisting of a schizophrenia proband, at least one unaffected sibling, and both parents underwent a comprehensive endophenotype and clinical characterization. The Family Interview for Genetic Studies was administered to all participants and used to obtain convergent psychiatric symptom information for additional first-degree relatives. Among the families, 97 were multiply affected, and 96 were singletons. RESULTS Both PPI and P50 gating displayed substantially increased heritability in the 97 multiply affected families (47% and 36%, respectively) compared with estimates derived from the entire sample of 296 families (29% and 20%, respectively). However, no evidence for heritability was observed for either measure in the 96 singleton families. Schizophrenia probands derived from the multiply affected families also displayed a significantly increased severity of clinical symptoms compared with those from singleton families. CONCLUSIONS PPI and P50 gating measures demonstrate substantially increased heritability in schizophrenia families with a higher genetic vulnerability for illness, providing further support for the commonality of genes underlying both schizophrenia and gating measures.
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Affiliation(s)
| | - Gregory A. Light
- Department of Psychiatry, University of California San Diego, La Jolla, CA,VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
| | - Neal R. Swerdlow
- Department of Psychiatry, University of California San Diego, La Jolla, CA
| | - Monica E. Calkins
- Department of Psychiatry, University of Pennsylvania, Philadelphia, PA
| | - Michael F. Green
- Department of Psychiatry and Biobehavioral Sciences, University of California Los Angeles, Los Angeles, CA,VA Greater Los Angeles Healthcare System, Los Angeles, CA
| | - Raquel E. Gur
- Department of Psychiatry, University of Pennsylvania, Philadelphia, PA
| | - Ruben C. Gur
- Department of Psychiatry, University of Pennsylvania, Philadelphia, PA
| | - Laura C. Lazzeroni
- Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA
| | - Keith H. Nuechterlein
- Department of Psychiatry and Biobehavioral Sciences, University of California Los Angeles, Los Angeles, CA
| | - Ann Olincy
- Department of Psychiatry, University of Colorado Health Sciences Center, Denver, CO
| | - Allen D. Radant
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA,VA Puget Sound Health Care System, Seattle, WA
| | - Larry J. Seidman
- Department of Psychiatry, Harvard Medical School, Boston, MA,Massachusetts Mental Health Center Public Psychiatry Division of the Beth Israel Deaconess Medical Center, Boston, MA
| | - Larry J. Siever
- Department of Psychiatry, The Mount Sinai School of Medicine, New York, NY,James J. Peters VA Medical Center, New York, NY
| | - Jeremy M. Silverman
- Department of Psychiatry, The Mount Sinai School of Medicine, New York, NY,James J. Peters VA Medical Center, New York, NY
| | - William S. Stone
- Department of Psychiatry, Harvard Medical School, Boston, MA,Massachusetts Mental Health Center Public Psychiatry Division of the Beth Israel Deaconess Medical Center, Boston, MA
| | - Catherine A. Sugar
- Department of Biostatistics, University of California Los Angeles School of Public Health, Los Angeles, CA
| | - Debby W. Tsuang
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA,VA Puget Sound Health Care System, Seattle, WA
| | - Ming T. Tsuang
- Department of Psychiatry, University of California San Diego, La Jolla, CA,Center for Behavioral Genomics, and Institute for Genomic Medicine, University of California San Diego, La Jolla, CA,Harvard Institute of Psychiatric Epidemiology and Genetics, Boston, MA
| | - Bruce I. Turetsky
- Department of Psychiatry, University of Pennsylvania, Philadelphia, PA
| | - Robert Freedman
- Department of Psychiatry, University of Colorado Health Sciences Center, Denver, CO
| | - David L. Braff
- Department of Psychiatry, University of California San Diego, La Jolla, CA,VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
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Wang X, Pinto-Duarte A, Behrens MM, Zhou X, Sejnowski TJ. Characterization of spatio-temporal epidural event-related potentials for mouse models of psychiatric disorders. Sci Rep 2015; 5:14964. [PMID: 26459883 PMCID: PMC4602219 DOI: 10.1038/srep14964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/11/2015] [Indexed: 11/30/2022] Open
Abstract
Distinctive features in sensory event-related potentials (ERPs) are endophenotypic biomarkers of psychiatric disorders, widely studied using electroencephalographic (EEG) methods in humans and model animals. Despite the popularity and unique significance of the mouse as a model species in basic research, existing EEG methods applicable to mice are far less powerful than those available for humans and large animals. We developed a new method for multi-channel epidural ERP characterization in behaving mice with high precision, reliability and convenience and report an application to time-domain ERP feature characterization of the Sp4 hypomorphic mouse model for schizophrenia. Compared to previous methods, our spatio-temporal ERP measurement robustly improved the resolving power of key signatures characteristic of the disease model. The high performance and low cost of this technique makes it suitable for high-throughput behavioral and pharmacological studies.
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Affiliation(s)
- Xin Wang
- Howard Hughes Medical Institute and the Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - António Pinto-Duarte
- Howard Hughes Medical Institute and the Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - M Margarita Behrens
- Howard Hughes Medical Institute and the Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Xianjin Zhou
- Department of Psychiatry, University of California at San Diego, La Jolla, CA 92093, USA
| | - Terrence J Sejnowski
- Howard Hughes Medical Institute and the Salk Institute for Biological Studies, La Jolla, CA 92037, USA.,Division of Biological Sciences, University of California at San Diego, La Jolla, CA 92093, USA
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Vaina LM, Rana KD, Cotos I, Li-Yang C, Huang MA, Podea D. When does subliminal affective image priming influence the ability of schizophrenic patients to perceive face emotions? Med Sci Monit 2014; 20:2788-98. [PMID: 25537115 PMCID: PMC4282928 DOI: 10.12659/msm.893118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background Deficits in face emotion perception are among the most pervasive aspects of schizophrenia impairments which strongly affects interpersonal communication and social skills. Material/Methods Schizophrenic patients (PSZ) and healthy control subjects (HCS) performed 2 psychophysical tasks. One, the SAFFIMAP test, was designed to determine the impact of subliminally presented affective or neutral images on the accuracy of face-expression (angry or neutral) perception. In the second test, FEP, subjects saw pictures of face-expression and were asked to rate them as angry, happy, or neutral. The following clinical scales were used to determine the acute symptoms in PSZ: Positive and Negative Syndrome (PANSS), Young Mania Rating (YMRS), Hamilton Depression (HAM-D), and Hamilton Anxiety (HAM-A). Results On the SAFFIMAP test, different from the HCS group, the PSZ group tended to categorize the neutral expression of test faces as angry and their response to the test-face expression was not influenced by the affective content of the primes. In PSZ, the PANSS-positive score was significantly correlated with correct perception of angry faces for aggressive or pleasant primes. YMRS scores were strongly correlated with PSZ’s tendency to recognize angry face expressions when the prime was a pleasant or a neutral image. The HAM-D score was positively correlated with categorizing the test-faces as neutral, regardless of the affective content of the prime or of the test-face expression (angry or neutral). Conclusions Despite its exploratory nature, this study provides the first evidence that conscious perception and categorization of facial emotions (neutral or angry) in PSZ is directly affected by their positive or negative symptoms of the disease as defined by their individual scores on the clinical diagnostic scales.
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Affiliation(s)
- Lucia Maria Vaina
- Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Kunjan D Rana
- Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Ionela Cotos
- Department of Psychiatry, County Emergency Clinical Hospital, Arad, Romania
| | - Chen Li-Yang
- Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Melissa A Huang
- Brain and Vision Research Laboratory, Department of Biomedical Engineering, Boston University, Boston, MA, USA
| | - Delia Podea
- Department of Psychiatry, County Emergency Clinical Hospital, Arad, Romania
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Zhang J, Chu KW, Teague EB, Newmark RE, Buchsbaum MS. fMRI assessment of thalamocortical connectivity during attentional performance. Magn Reson Imaging 2013; 31:1112-8. [PMID: 23727467 DOI: 10.1016/j.mri.2013.01.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 01/16/2013] [Accepted: 01/16/2013] [Indexed: 12/18/2022]
Abstract
Functional magnetic resonance imaging (fMRI) studies have shown dysfunction in key areas associated with the thalamocortical circuit in patients with schizophrenia. This study examined the functional connectivity involving the frontal-thalamic circuitry during a spatial focusing-of-attention task in 18 unmedicated patients with schizophrenia and 38 healthy controls. Functional connectivity was analyzed by assigning seed regions (in the thalamic nuclei (mediodorsal nucleus (MDN), pulvinar, anterior nucleus (AN)), the dorsolateral prefrontal cortex (Brodmann areas 9 and 46), and the caudate), and correlating their respective activity with that in the non-seed regions voxel-wise. Functional connectivity analysis demonstrated that functional connectivity was significantly impaired in patients, e.g., between the right pulvinar and regions such as the prefrontal and temporal cortices and the cerebellum. On the other hand, enhanced functional connectivity was found in patients, e.g., between the AN and regions such as the prefrontal and temporal cortices. In addition, the patients had significantly lower task performance and less (but non-significant) brain activation than those of controls. These results revealed disturbed functional integration in schizophrenia, and suggested that the functional connectivity abnormalities in the thalamocortical circuitry, especially the frontal-thalamic circuitry, may underlie the attention deficits in schizophrenia patients. Further, this study suggested that functional connectivity analysis might be more sensitive than brain activation analysis in detecting the functional abnormalities in schizophrenia.
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Affiliation(s)
- Jing Zhang
- Department of Bioinformatics, School of Biomedical Engineering, Capital Medical University, Beijing 100069, PR China.
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Rissling AJ, Park SH, Young JW, Rissling MB, Sugar CA, Sprock J, Mathias DJ, Pela M, Sharp RF, Braff DL, Light GA. Demand and modality of directed attention modulate "pre-attentive" sensory processes in schizophrenia patients and nonpsychiatric controls. Schizophr Res 2013; 146:326-35. [PMID: 23490760 PMCID: PMC3622836 DOI: 10.1016/j.schres.2013.01.035] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Revised: 01/28/2013] [Accepted: 01/30/2013] [Indexed: 11/24/2022]
Abstract
BACKGROUND Mismatch negativity (MNN) and P3a are event related potential (ERP) measures of early sensory information processing. These components are usually conceptualized as being "pre-attentive" and therefore immune to changes with variations in attentional functioning. This study aimed to determine whether manipulations of attention influence the amplitudes and latencies of MMN and P3a and, if so, the extent to which these early sensory processes govern concurrent behavioral vigilance performance in schizophrenia patients and normal subjects. METHODS Schizophrenia patients (SZ; n = 20) and Nonpsychiatric Control Subjects (NCS; n = 20) underwent auditory ERP testing to assess MMN and P3a across 4 EEG recording sessions in which attentional demand (low vs. high) and sensory modality of directed attention (visual vs. auditory) were experimentally varied. RESULTS Across conditions, SZ patients exhibited deficits in MMN and P3a amplitudes. Significant amplitude and latency modulation were observed in both SZ and NCS but there were no group-by-condition interactions. The amount of MMN amplitude attenuation from low- to high-demand tasks was significantly associated with increased vigilance performance in both SZ and NCS groups (r = -0.67 and r = -0.60). Several other robust associations were also observed among neurophysiologic, clinical and cognitive variables. CONCLUSIONS Attentional demand and modality of directed attention significantly influence the amplitude and latencies of "pre-attentive" ERP components in both SZ and NCS. Deficits in MMN and P3a were not "normalized" when attention was directed to the auditory stimuli in schizophrenia patients. The adaptive modulation of early sensory information processing appears to govern concurrent attentional task performance. The temporal window reflecting automatic sensory discrimination as indexed as MMN and P3a may serve as a gateway to some higher order cognitive operations necessary for psychosocial functioning.
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Affiliation(s)
| | - Sung-Hyouk Park
- Department of Psychiatry, University of California San Diego, La Jolla, CA,Department of Psychiatry, Chookryoung Evangelical Hospital, Namyangju, Gyeonggi, South Korea
| | - Jared W. Young
- Department of Psychiatry, University of California San Diego, La Jolla, CA, VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
| | | | - Catherine A. Sugar
- Department of Psychiatry, University of California Los Angeles, Los Angeles, CA, Department of Biostatistics, University of California Los Angeles, Los Angeles, CA, VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), Greater Los Angeles VA Healthcare System
| | - Joyce Sprock
- Department of Psychiatry, University of California San Diego, La Jolla, CA, VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
| | - Daniel J. Mathias
- Department of Psychiatry, University of California San Diego, La Jolla, CA
| | - Marlena Pela
- Department of Psychiatry, University of California San Diego, La Jolla, CA
| | - Richard F. Sharp
- Department of Psychiatry, University of California San Diego, La Jolla, CA
| | - David L. Braff
- Department of Psychiatry, University of California San Diego, La Jolla, CA, VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
| | - Gregory A. Light
- Department of Psychiatry, University of California San Diego, La Jolla, CA, VISN-22 Mental Illness, Research, Education and Clinical Center (MIRECC), VA San Diego Healthcare System
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Gajewska A, Blumenthal TD, Winter B, Herrmann MJ, Conzelmann A, Mühlberger A, Warrings B, Jacob C, Arolt V, Reif A, Zwanzger P, Pauli P, Deckert J, Domschke K. Effects of ADORA2A gene variation and caffeine on prepulse inhibition: a multi-level risk model of anxiety. Prog Neuropsychopharmacol Biol Psychiatry 2013; 40:115-21. [PMID: 22940476 DOI: 10.1016/j.pnpbp.2012.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Revised: 08/08/2012] [Accepted: 08/16/2012] [Indexed: 01/13/2023]
Abstract
The complex pathogenesis of anxiety and panic disorder in particular has been suggested to be influenced by genetic factors such as the adenosine A2A receptor gene (ADORA2A) 1976T>C polymorphism (rs5751876) as well as neuropsychological factors such as early information processing deficits. In 114 healthy individuals (males=57, females=57) controlled for anxiety sensitivity (AS), a multi-level risk model of the development of anxiety was applied: Genetic (ADORA2A 1976T>C variant) and biochemical (300 mg of caffeine citrate vs. placebo) factors were hypothesized to influence early information processing as measured by the prepulse inhibition/facilitation paradigm (stimulus onset asynchronies (SOAs) of 60, 120, 240, 480 and 2000ms between prepulses and startle stimuli). A fourfold interaction of genotype, intervention, gender, and SOAs was discerned. Stratification by SOAs revealed that at 120 ms and 240 ms SOAs in the caffeine condition, PPI was impaired in female ADORA2A 1976TT risk genotype carriers as compared to male ADORA2A 1976TT homozygotes, while no significant effects were observed in the ADORA2A 1976CC/CT non-risk genotype or placebo group. Only in high anxiety sensitive probands, a significant intervention effect was discerned with impaired prepulse facilitation (PPF) due to caffeine. The present results point to an impaired ability to selectively process very early information and to gate irrelevant sensory information, respectively, in female ADORA2A 1976TT homozygotes in response to caffeine, providing further evidence for the adenosinergic system to be involved in the pathogenesis of anxiety.
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Affiliation(s)
- Agnieszka Gajewska
- Department of Psychiatry, Psychosomatics and Psychotherapy, University of Wuerzburg, Fuechsleinstrasse 15, D-97080 Wuerzburg, Germany
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Takahashi H, Rissling AJ, Pascual-Marqui R, Kirihara K, Pela M, Sprock J, Braff DL, Light GA. Neural substrates of normal and impaired preattentive sensory discrimination in large cohorts of nonpsychiatric subjects and schizophrenia patients as indexed by MMN and P3a change detection responses. Neuroimage 2012; 66:594-603. [PMID: 23085112 DOI: 10.1016/j.neuroimage.2012.09.074] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 09/25/2012] [Accepted: 09/30/2012] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVE Schizophrenia (SZ) patients have information processing deficits, spanning from low level sensory processing to higher-order cognitive functions. Mismatch negativity (MMN) and P3a are event-related potential (ERP) components that are automatically elicited in response to unattended changes in ongoing, repetitive stimuli that provide a window into abnormal information processing in SZ. MMN and P3a are among the most robust and consistently identified deficits in SZ, yet the neural substrates of these responses and their associated deficits in SZ are not fully understood. This study examined the neural sources of MMN and P3a components in a large cohort of SZ and nonpsychiatric control subjects (NCS) using Exact Low Resolution Electromagnetic Tomography Analyses (eLORETA) in order to identify the neural sources of MMN and P3a as well as the brain regions associated with deficits commonly observed among SZ patients. METHODS 410 SZ and 247 NCS underwent EEG testing using a duration-deviant auditory oddball paradigm (1-kHz tones, 500ms SOA; standard p=0.90, 50-ms duration; deviant tones P=0.10, 100-ms duration) while passively watching a silent video. Voxel-by-voxel within- (MMN vs. P3a) and between-group (SZ vs. NCS) comparisons were performed using eLORETA. RESULTS SZ had robust deficits in MMN and P3a responses measured at scalp electrodes consistent with other studies. These components mapped onto neural sources broadly distributed across temporal, frontal, and parietal regions. MMN deficits in SZ were associated with reduced activations in discrete medial frontal brain regions, including the anterior-posterior cingulate and medial frontal gyri. These early sensory discriminatory MMN impairments were followed by P3a deficits associated with widespread reductions in the activation of attentional networks (frontal, temporal, parietal regions), reflecting impaired orienting or shifts of attention to the infrequent stimuli. CONCLUSIONS MMN and P3a are dissociable responses associated with broadly distributed patterns of neural activation. MMN deficits among SZ patients appear to be primarily accounted for by reductions in medial prefrontal brain regions that are followed by widespread dysfunction across cortical networks associated with P3a in a manner that is consistent with hierarchical information processing models of cognitive deficits in SZ patients. Impairments in automatic stimulus discrimination may contribute to higher-order cognitive and psychosocial deficits in SZ.
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Affiliation(s)
- Hidetoshi Takahashi
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA; Department of Child and Adolescent Mental Health, National Institute of Mental Health, National Center of Neurology and Psychiatry, Japan
| | - Anthony J Rissling
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Roberto Pascual-Marqui
- The KEY Institute for Brain-Mind Research, University Hospital of Psychiatry, Zurich, Switzerland
| | - Kenji Kirihara
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Marlena Pela
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA
| | - Joyce Sprock
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA; VISN-22 Mental Illness, Research, Education and Clinical Center, VA San Diego Healthcare System, USA
| | - David L Braff
- Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA; VISN-22 Mental Illness, Research, Education and Clinical Center, VA San Diego Healthcare System, USA
| | - Gregory A Light
- VISN-22 Mental Illness, Research, Education and Clinical Center, VA San Diego Healthcare System, USA; Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA.
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Abbott CC, Merideth F, Ruhl D, Yang Z, Clark VP, Calhoun VD, Hanlon FM, Mayer AR. Auditory orienting and inhibition of return in schizophrenia: a functional magnetic resonance imaging study. Prog Neuropsychopharmacol Biol Psychiatry 2012; 37:161-8. [PMID: 22230646 PMCID: PMC3690330 DOI: 10.1016/j.pnpbp.2011.12.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 12/19/2011] [Accepted: 12/23/2011] [Indexed: 11/26/2022]
Abstract
Patients with schizophrenia (SP) exhibit deficits in both attentional reorienting and inhibition of return (IOR) during visual tasks. However, it is currently unknown whether these deficits are supramodal in nature and how these deficits relate to other domains of cognitive dysfunction. In addition, the neuronal correlates of this pathological orienting response have not been investigated in either the visual or auditory modality. Therefore, 30 SP and 30 healthy controls (HC) were evaluated with an extensive clinical protocol and functional magnetic resonance imaging (fMRI) during an auditory cuing paradigm. SP exhibited both increased costs and delayed IOR during auditory orienting, suggesting a prolonged interval for attentional disengagement from cued locations. Moreover, a delay in the development of IOR was associated with cognitive deficits on formal neuropsychological testing in the domains of attention/inhibition and working memory. Event-related fMRI showed the characteristic activation of a frontoparietal network (invalid trials>valid trials), but there were no differences in functional activation between patients and HC during either attentional reorienting or IOR. Current results suggest that orienting deficits are supramodal in nature in SP, and are related to higher-order cognitive deficits that directly interfere with day-to-day functioning.
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Affiliation(s)
- Christopher C. Abbott
- Psychiatry Department, University of New Mexico School of Medicine, Albuquerque, NM 87131
| | | | - David Ruhl
- The Mind Research Network, Albuquerque, NM 87106
| | - Zhen Yang
- The Mind Research Network, Albuquerque, NM 87106
| | - Vincent P. Clark
- The Mind Research Network, Albuquerque, NM 87106,Psychology Department, University of New Mexico, Albuquerque, NM 87131
| | - Vince D. Calhoun
- Psychiatry Department, University of New Mexico School of Medicine, Albuquerque, NM 87131,The Mind Research Network, Albuquerque, NM 87106,Electrical and Computer Engineering Department, University of New Mexico, Albuquerque, NM 87131
| | - Faith M. Hanlon
- Psychiatry Department, University of New Mexico School of Medicine, Albuquerque, NM 87131,The Mind Research Network, Albuquerque, NM 87106,Psychology Department, University of New Mexico, Albuquerque, NM 87131
| | - Andrew R. Mayer
- The Mind Research Network, Albuquerque, NM 87106,Psychology Department, University of New Mexico, Albuquerque, NM 87131,Neurology Department, University of New Mexico School of Medicine, Albuquerque, NM 87131,Corresponding author: Andrew Mayer, Ph.D., The Mind Research Network, Pete & Nancy Domenici Hall, 1101 Yale Blvd. NE, Albuquerque, NM 87106; Tel: 505-272-0769; Fax: 505-272-8002;
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Ikeda C, Kirino E, Inoue R, Arai H. Event-related potential study of illusory contour perception in schizophrenia. Neuropsychobiology 2012; 64:231-8. [PMID: 21912192 DOI: 10.1159/000327706] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Accepted: 03/20/2011] [Indexed: 11/19/2022]
Abstract
Schizophrenic patients and healthy controls participated in event-related potential experiments, in which illusory contour (IC) and control objects [no contour (NC), real contour (RC)] were passively presented. As a result, P100 latency for IC in schizophrenic patients was significantly prolonged (+10.6 ms) compared to those for RC. The present findings indicate that an abnormality of IC processing, including 'bottom-up' as well as 'top-down' processing, may reflect basal pathogenesis of various clinical representations of schizophrenia. However, the P100 latency difference between IC and RC was very small in the patient group. Rather, 'cognitive' in the Positive and Negative Syndrome Scale (PANSS) model of Bell et al. significantly correlated with P100 latencies for NC. Such an association between PANSS and NC processing, where the shape must be inferred with increased attentional demands and 'top-down' processing, indicates that the abnormality of schizophrenic patients' preattentive process might be a problem of 'top-down' processing rather than 'bottom-up' processing.
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Affiliation(s)
- Chisako Ikeda
- Department of Psychiatry, Juntendo University School of Medicine, Koshigaya, Japan
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15
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Jahshan C, Cadenhead KS, Rissling AJ, Kirihara K, Braff DL, Light GA. Automatic sensory information processing abnormalities across the illness course of schizophrenia. Psychol Med 2012; 42:85-97. [PMID: 21740622 PMCID: PMC3193558 DOI: 10.1017/s0033291711001061] [Citation(s) in RCA: 135] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Deficits in automatic sensory discrimination, as indexed by a reduction in the mismatch negativity (MMN) and P3a event-related potential amplitudes, are well documented in chronic schizophrenia. However, MMN and P3a have not been sufficiently studied early in the course of psychotic illness. The present study aimed to investigate MMN, P3a and reorienting negativity (RON) across the course of schizophrenia. METHOD MMN, P3a, and RON were assessed in 118 subjects across four groups: (1) individuals at risk for psychosis (n=26); (2) recent-onset patients (n=31); (3) chronic patients (n=33); and (4) normal controls (n=28) using a duration-deviant auditory oddball paradigm. RESULTS Frontocentral deficits in MMN and P3a were present in all patient groups. The at-risk group's MMN and P3a amplitudes were intermediate to those of the control and recent-onset groups. The recent-onset and chronic patients, but not the at-risk subjects, showed significant RON amplitude reductions, relative to the control group. Associations between MMN, P3a, RON and psychosocial functioning were present in the chronic patients. In the at-risk subjects, P3a and RON deficits were significantly associated with higher levels of negative symptoms. CONCLUSIONS Abnormalities in the automatic processes of sensory discrimination, orienting and reorienting of attention are evident in the early phases of schizophrenia and raise the possibility of progressive worsening across stages of the illness. The finding that MMN and P3a, but not RON, were reduced before psychosis onset supports the continued examination of these components as potential early biomarkers of schizophrenia.
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Affiliation(s)
- Carol Jahshan
- Mental Illness Research, Education and Clinical Center, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | - Kristin S. Cadenhead
- Department of Psychiatry, University of California, San Diego, La Jolla, California
| | - Anthony J. Rissling
- Department of Psychiatry, University of California, San Diego, La Jolla, California
| | - Kenji Kirihara
- Department of Psychiatry, University of California, San Diego, La Jolla, California
| | - David L. Braff
- Department of Psychiatry, University of California, San Diego, La Jolla, California
| | - Gregory A. Light
- Department of Psychiatry, University of California, San Diego, La Jolla, California
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Cognitive control and discourse comprehension in schizophrenia. SCHIZOPHRENIA RESEARCH AND TREATMENT 2012; 2012:484502. [PMID: 22970364 PMCID: PMC3420642 DOI: 10.1155/2012/484502] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 01/17/2012] [Indexed: 11/21/2022]
Abstract
Cognitive deficits across a wide range of domains have been consistently observed in schizophrenia and are linked to poor functional outcome (Green, 1996; Carter, 2006). Language abnormalities are among the most salient and include disorganized speech as well as deficits in comprehension. In this review, we aim to evaluate impairments of language processing in schizophrenia in relation to a domain-general control deficit. We first provide an overview of language comprehension in the healthy human brain, stressing the role of cognitive control processes, especially during discourse comprehension. We then discuss cognitive control deficits in schizophrenia, before turning to evidence suggesting that schizophrenia patients are particularly impaired at processing meaningful discourse as a result of deficits in control functions. We conclude that domain-general control mechanisms are impaired in schizophrenia and that during language comprehension this is most likely to result in difficulties during the processing of discourse-level context, which involves integrating and maintaining multiple levels of meaning. Finally, we predict that language comprehension in schizophrenia patients will be most impaired during discourse processing. We further suggest that discourse comprehension problems in schizophrenia might be mitigated when conflicting information is absent and strong relations amongst individual words are present in the discourse context."There is no "centre of Speech" in the brain any more than there is a faculty of Speech in the mind.The entire brain, more or less, is at work in a man who uses language"William JamesFrom The Principles of Psychology, 1890"The mind in dementia praecox is like an orchestra without a conductor"Kraepelin, 1919.
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Abstract
Cortical electrophysiologic event-related potentials are multidimensional measures of information processing that are well-suited for efficiently parsing automatic and controlled components of cognition that span the range of deficits evidenced in schizophrenia patients. These information processes are key cognitive measures that are recognized as informative and valid targets for understanding the neurobiology of schizophrenia. These measures may be used in concert with the Measurement and Treatment Research to Improve Cognition in Schizophrenia (MATRICS) neurocognitive measures in the development of novel treatments for schizophrenia and related neuropsychiatric disorders. The employment of novel event-related potential paradigms designed to carefully characterize the early spectrum of perceptual and cognitive information processing allows investigators to identify the neurophysiologic basis of cognitive dysfunction in schizophrenia and to examine the associated clinical and functional impairments.
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Scholes KE, Martin-Iverson MT. Disturbed prepulse inhibition in patients with schizophrenia is consequential to dysfunction of selective attention. Psychophysiology 2010; 47:223-35. [DOI: 10.1111/j.1469-8986.2009.00927.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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20
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Evaluating pigeonholing as an explanatory construct for schizophrenics' cognitive deficiencies. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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23
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Language disorder and hemispheric asymmetries in schizophrenia. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Schizophrenic information-processing deficit: What type or level of processing is disordered? Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Failure to establish appropriate response sets: An explanation for a range of schizophrenic phenomena? Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013789] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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27
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28
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29
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30
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Is there a schizophrenic condition? Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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What is meant by schizophrenic speech? Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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33
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34
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35
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Schizophrenic thought disorder: Linguistic incompetence or information-processing impairment? Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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36
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A neurologist looks at “schizophasia”. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Abstract
AbstractAmong the many peculiarities of schizophrenics perhaps the most obvious is their tendency to say odd things. Indeed, for most clinicians, the hallmark of schizophrenia is “thought disorder” (which is usually defined tautologically as incoherent speech). Decades of clinical observations, experimental research, and linguistic analyses have produced many hypotheses about what, precisely, is wrong with schizophrenic speech and language. These hypotheses range from assertions that schizophrenics have peculiar word association hierarchies to the notion that schizophrenics are suffering from an intermittent form of aphasia. In this article, several popular hypotheses (and the observations on which they are based) are critically assessed. Work in the area turns out to be flawed by errors in experimental method, faulty observations, tautological reasoning, and theoretical models that ignore the complexities of both speech and language. This does not mean that schizophrenics are indistinguishable from nonschizophrenics. They are clearly deviant in many situations. Their problem, however, appears to be in processing information and in selective attention, not in language itself.
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Psychiatric diagnosis: A double taxonomic swamp. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Abstract
AbstractThis paper puts forward a general framework for thought about human information processing. It is intended to avoid some of the problems of pipeline or stage models of function. At the same time it avoids the snare of supposing a welter of indefinitely many separate processes. The approach is not particularly original, but rather represents the common elements or presuppositions in a number of modern theories. These presuppositions are not usually explicit, however, and making them so reduces the danger of slipping back into earlier modes of thought.The key point is to distinguish between persisting representations and the processes that translate one representation into another. Various classes or groups of persisting representations can be distinguished by the experimental treatments that interfere with them. In particular, there now seem to be several kinds of short-term or temporary storage, different from each other as well as from longterm memory; the translating processes also have several different modes or kinds. A particularly important aspect of the current position is that a model of this general type no longer requires some external agent to direct and control long sequences of behaviour.
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Stages in the disintegration of thought and language competence in schizophrenia. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x00013935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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The language of schizophrenic language. Behav Brain Sci 2010. [DOI: 10.1017/s0140525x0001387x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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48
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Braff DL. Prepulse inhibition of the startle reflex: a window on the brain in schizophrenia. Curr Top Behav Neurosci 2010; 4:349-71. [PMID: 21312406 DOI: 10.1007/7854_2010_61] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Prepulse inhibition (PPI) of the startle response is an important measure of information processing deficits and inhibitory failure in schizophrenia patients. PPI is especially useful because it occurs in the same lawful manner in all mammals, from humans to rodents, making it an ideal candidate for cross-species translational research. PPI deficits occur across the "schizophrenia spectrum" from schizophrenia patients to their clinically unaffected relatives. Parallel animal model and human brain imaging studies have demonstrated that PPI is modulated by cortico-striato-pallido-thalamic (and pontine) circuitry. This circuitry is also implicated in schizophrenia neuropathology and neurophysiology. The finding of PPI deficits in schizophrenia patients has been replicated by many groups, and these deficits correlate with measures of thought disorder and appear to be "normalized" by second generation antipsychotic (SGA) medications. Consistent pharmacological effects on PPI have been demonstrated; among these, dopamine agonists induce PPI deficits and (in animal models) these are reversed by first and SGA medications. PPI is also significantly heritable in humans and animals and can be used as a powerful endophenotype in studies of families of schizophrenia patients. Genomic regions, including the NRGL-ERBB4 complex with its glutamatergic influences, are strongly implicated in PPI deficits in schizophrenia. PPI continues to hold promise as an exciting translational cross-species measure that can be used to understand the pathophysiology and treatment of the schizophrenias via pharmacological, anatomic, and genetic studies.
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Affiliation(s)
- David L Braff
- Department of Psychiatry, University of California, San Diego (UCSD), 9500 Gilman Drive, La Jolla, CA 92093-0804, USA.
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Michael AM, Baum SA, Fries JF, Ho BC, Pierson RK, Andreasen NC, Calhoun VD. A method to fuse fMRI tasks through spatial correlations: applied to schizophrenia. Hum Brain Mapp 2009; 30:2512-29. [PMID: 19235877 PMCID: PMC2711995 DOI: 10.1002/hbm.20691] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2008] [Revised: 08/27/2008] [Accepted: 09/24/2008] [Indexed: 11/11/2022] Open
Abstract
Single task analysis methods of functional MRI brain data, though useful, are not able to evaluate the joint information between tasks. Data fusion of multiple tasks that probe different cognitive processes provides knowledge of the joint information and may be important in order to better understand complex disorders such as schizophrenia. In this article, we introduce a simple but effective technique to fuse two tasks by computing the histogram of correlations for all possible combinations of whole brain voxels. The approach was applied to data derived from healthy controls and patients with schizophrenia from four different tasks, auditory oddball (target), auditory oddball (novel), Sternberg working memory, and sensorimotor. It was found that in four out of six task combinations patients' intertask correlations were more positively correlated than controls', in one combination the controls showed more positive correlations and in another there was no significant difference. The robustness of this result was checked with several testing techniques. The four task combinations for which patients had more positive correlation occurred at different scanning sessions and the task combination that showed the opposite result occurred within the same scanning session. Brain regions that showed high intertask correlations were found for both groups and regions that correlated differently between the two groups were identified. The approach introduced finds interesting results and new differential features that cannot be achieved through traditional methods.
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Distinct conflict resolution deficits related to different facets of Schizophrenia. PSYCHOLOGICAL RESEARCH 2008; 73:786-93. [PMID: 19034500 DOI: 10.1007/s00426-008-0195-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Accepted: 10/01/2008] [Indexed: 10/21/2022]
Abstract
An important issue in understanding the nature of conflict processing is whether it is a unitary or multidimensional construct. One way to examine this is to study whether people with impaired conflict processing exhibit a general pattern of deficits or whether they exhibit impairments in distinct aspects of conflict processing. One group who might exhibit conflict deficits are people with schizophrenia. Schizophrenia is a heterogeneous disorder, with one way to break down the heterogeneity of schizophrenia is to examine specific symptoms. Previous research has found that specific symptoms of schizophrenia are associated with specific deficits in conflict processing. In particular, disorganization is associated with increased response conflict, alogia is associated with increased retrieval conflict, and anhedonia is associated with increased emotional conflict. Moreover, there is evidence that different types of conflict processing are unassociated with each other. This evidence suggests that conflict processing is a multidimensional construct and that different aspects of schizophrenia are associated with impairments in processing different types of conflict.
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