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Gaura V, Lavisse S, Payoux P, Goldman S, Verny C, Krystkowiak P, Damier P, Supiot F, Bachoud-Levi AC, Remy P. Association Between Motor Symptoms and Brain Metabolism in Early Huntington Disease. JAMA Neurol 2017; 74:1088-1096. [PMID: 28672395 DOI: 10.1001/jamaneurol.2017.1200] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Importance Brain hypometabolism is associated with the clinical consequences of the degenerative process, but little is known about regional hypermetabolism, sometimes observed in the brain of patients with clinically manifest Huntington disease (HD). Studying the role of regional hypermetabolism is needed to better understand its interaction with the motor symptoms of the disease. Objective To investigate the association between brain hypometabolism and hypermetabolism with motor scores of patients with early HD. Design, Setting, and Participants This study started in 2001, and analysis was completed in 2016. Sixty symptomatic patients with HD and 15 healthy age-matched control individuals underwent positron emission tomography to measure cerebral metabolism in this cross-sectional study. They also underwent the Unified Huntington's Disease Rating Scale motor test, and 2 subscores were extracted: (1) a hyperkinetic score, combining dystonia and chorea, and (2) a hypokinetic score, combining bradykinesia and rigidity. Main Outcomes and Measures Statistical parametric mapping software (SPM5) was used to identify all hypo- and hypermetabolic regions in patients with HD relative to control individuals. Correlation analyses (P < .001, uncorrected) between motor subscores and brain metabolic values were performed for regions with significant hypometabolism and hypermetabolism. Results Among 60 patients with HD, 22 were women (36.7%), and the mean (SD) age was 44.6 (7.6) years. Of the 15 control individuals, 7 were women (46.7%), and the mean (SD) age was 42.2 (7.3) years. In statistical parametric mapping, striatal hypometabolism was significantly correlated with the severity of all motor scores. Hypermetabolism was negatively correlated only with hypokinetic scores in the cuneus (z score = 3.95, P < .001), the lingual gyrus (z score = 4.31, P < .001), and the crus I/II of the cerebellum (z score = 3.77, P < .001), a region connected to associative cortical areas. More severe motor scores were associated with higher metabolic values in the inferior parietal lobule, anterior cingulate, inferior temporal lobule, the dentate nucleus, and the cerebellar lobules IV/V, VI, and VIII bilaterally corresponding to the motor regions of the cerebellum (z score = 3.96 and 3.42 in right and left sides, respectively; P < .001). Conclusions and Relevance Striatal hypometabolism is associated with clinical disease severity. Conversely, hypermetabolism is likely compensatory in regions where it is associated with decreasing motor scores. Hypermetabolism might be detrimental in other structures in which it is associated with more severe motor symptoms. In the cerebellum, both compensatory and detrimental contributions seem to occur. This study helps to better understand the motor clinical relevance of hypermetabolic brain regions in HD.
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Affiliation(s)
- Véronique Gaura
- Commissariat à l'Energie Atomique et aux Energies Alternatives, Département des Sciences du Vivant, Institut d'Imagerie Biomédicale, MIRCen, Fontenay-aux-Roses, France.,Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud, Université Paris-Saclay, UMR 9199, Neurodegenerative Diseases Laboratory, Fontenay-aux-Roses, France.,Department of Nuclear Medicine, CHU Tenon Hospital, Paris, France
| | - Sonia Lavisse
- Commissariat à l'Energie Atomique et aux Energies Alternatives, Département des Sciences du Vivant, Institut d'Imagerie Biomédicale, MIRCen, Fontenay-aux-Roses, France.,Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud, Université Paris-Saclay, UMR 9199, Neurodegenerative Diseases Laboratory, Fontenay-aux-Roses, France
| | - Pierre Payoux
- ToNIC, Toulouse NeuroImaging Centre, Université de Toulouse, INSERM, UPS, Toulouse, France.,Department of Nuclear Medicine, CHU Toulouse, Purpan University Hospital, Toulouse, France
| | - Serge Goldman
- Department of Nuclear Medicine, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Christophe Verny
- Centre National de Référence des Maladies Neurodégénératives Service de Neurologie and UMR CNRS 6214 INSERM U1083, CHU d'Angers, Angers, France
| | | | - Philippe Damier
- Neurology Department, CHRU de Nantes, Nantes, France.,Université Pierre et Marie Curie, Paris, France
| | - Frédéric Supiot
- Department of Nuclear Medicine, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Anne-Catherine Bachoud-Levi
- INSERM U955, Equipe 01, Neuropsychologie Interventionnelle, Créteil, France.,NeurATRIS, Fontenay-aux-Roses, France.,AP-HP, Hôpital Henri Mondor, Centre de Référence-Maladie de Huntington, Service de Neurologie, Créteil, France.,Faculté de Médecine, Université Paris Est-Créteil, Créteil, France.,Equipe Neuropsychologie Interventionnelle, Département d'Études Cognitives, École Normale Supérieure, PSL Research University, INSERM, Paris, France
| | - Philippe Remy
- Commissariat à l'Energie Atomique et aux Energies Alternatives, Département des Sciences du Vivant, Institut d'Imagerie Biomédicale, MIRCen, Fontenay-aux-Roses, France.,Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud, Université Paris-Saclay, UMR 9199, Neurodegenerative Diseases Laboratory, Fontenay-aux-Roses, France.,NeurATRIS, Fontenay-aux-Roses, France.,Faculté de Médecine, Université Paris Est-Créteil, Créteil, France.,Centre Expert Parkinson, CHU Henri Mondor, Créteil, France
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Kegelmeyer DA, Kostyk SK, Fritz NE, Fiumedora MM, Chaudhari A, Palettas M, Young G, Kloos AD. Quantitative biomechanical assessment of trunk control in Huntington's disease reveals more impairment in static than dynamic tasks. J Neurol Sci 2017; 376:29-34. [PMID: 28431622 DOI: 10.1016/j.jns.2017.02.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/03/2017] [Accepted: 02/23/2017] [Indexed: 10/20/2022]
Abstract
Postural instability is common in individuals with Huntington's disease (HD), yet little is known about control of the trunk during static and dynamic activities. We compared the trunk motion of 41 individuals with HD and 36 controls at thoracic and pelvic levels during sitting, standing, and walking using wearable iPod sensors. We also examined the ability of individuals with HD to respond to an auditory cue to modify trunk position when the pelvis moved >8° in sagittal or frontal planes during sitting using custom software. We found that amplitude of thoracic and pelvic trunk movements was significantly greater in participants with HD, and differences were more pronounced during static (i.e. sitting, standing) than dynamic (i.e. walking) tasks. In contrast to the slow, smooth sinusoidal trunk movements of controls, individuals with HD demonstrated rapid movements with varying amplitudes that continuously increased without stabilizing. Ninety-seven percent of participants with HD were able to modify their trunk position in response to auditory cues. Our results demonstrate that wearable iPod sensors are clinically useful for rehabilitation professionals to measure and monitor trunk stability in persons with HD. Additionally, auditory cueing holds potential as a useful training tool to improve trunk stability in HD.
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Affiliation(s)
- Deb A Kegelmeyer
- Physical Therapy Division, School of Health and Rehabilitation Sciences, The Ohio State University, 453 West 10th Ave, Columbus, OH 43210, United States.
| | - Sandra K Kostyk
- Movement Disorders Division, Department of Neurology, The Ohio State University, Columbus, OH, United States.
| | - Nora E Fritz
- Physical Therapy Division, School of Health and Rehabilitation Sciences, The Ohio State University, 453 West 10th Ave, Columbus, OH 43210, United States.
| | - Marianne M Fiumedora
- Physical Therapy Division, School of Health and Rehabilitation Sciences, The Ohio State University, 453 West 10th Ave, Columbus, OH 43210, United States.
| | - Ajit Chaudhari
- Physical Therapy Division, School of Health and Rehabilitation Sciences, The Ohio State University, 453 West 10th Ave, Columbus, OH 43210, United States.
| | - Marilly Palettas
- Center for Biostatistics, The Ohio State University, Columbus, OH, United States.
| | - Gregory Young
- Center for Biostatistics, The Ohio State University, Columbus, OH, United States.
| | - Anne D Kloos
- Physical Therapy Division, School of Health and Rehabilitation Sciences, The Ohio State University, 453 West 10th Ave, Columbus, OH 43210, United States.
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Lunardini F, Bertucco M, Casellato C, Bhanpuri N, Pedrocchi A, Sanger TD. Speed-Accuracy Trade-Off in a Trajectory-Constrained Self-Feeding Task: A Quantitative Index of Unsuppressed Motor Noise in Children With Dystonia. J Child Neurol 2015; 30:1676-85. [PMID: 25895910 PMCID: PMC4575821 DOI: 10.1177/0883073815578526] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 02/18/2015] [Indexed: 11/15/2022]
Abstract
Motor speed and accuracy are both affected in childhood dystonia. Thus, deriving a speed-accuracy function is an important metric for assessing motor impairments in dystonia. Previous work in dystonia studied the speed-accuracy trade-off during point-to-point tasks. To achieve a more relevant measurement of functional abilities in dystonia, the present study investigates upper-limb kinematics and electromyographic activity of 8 children with dystonia and 8 healthy children during a trajectory-constrained child-relevant task that emulates self-feeding with a spoon and requires continuous monitoring of accuracy. The speed-accuracy trade-off is examined by changing the spoon size to create different accuracy demands. Results demonstrate that the trajectory-constrained speed-accuracy relation is present in both groups, but it is altered in dystonia in terms of increased slope and offset toward longer movement times. Findings are consistent with the hypothesis of increased signal-dependent noise in dystonia, which may partially explain the slow and variable movements observed in dystonia.
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Affiliation(s)
- Francesca Lunardini
- Department of Electronics, Information and Bioengineering, NearLab, Politecnico di Milano, Milano, 20133, Italy
| | - Matteo Bertucco
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, 90089-1111, USA
| | - Claudia Casellato
- Department of Electronics, Information and Bioengineering, NearLab, Politecnico di Milano, Milano, 20133, Italy
| | - Nasir Bhanpuri
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, 90089-1111, USA
| | - Alessandra Pedrocchi
- Department of Electronics, Information and Bioengineering, NearLab, Politecnico di Milano, Milano, 20133, Italy
| | - Terence D. Sanger
- Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, 90089-1111, USA,Department of Child Neurology, University of Southern California, Los Angeles, CA, 90089-1111, USA,Department of Biokinesiology & Physical Therapy, University of Southern California, Los Angeles, CA, 90089-1111, USA,Children’s Hospital Los Angeles, Los Angeles, CA, 90027, USA
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4
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Despard J, Ternes AM, Dimech-Betancourt B, Poudel G, Churchyard A, Georgiou-Karistianis N. Characterising Upper Limb Movements in Huntington's Disease and the Impact of Restricted Visual Cues. PLoS One 2015; 10:e0133709. [PMID: 26248012 PMCID: PMC4527591 DOI: 10.1371/journal.pone.0133709] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2014] [Accepted: 07/01/2015] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Voluntary motor deficits are a common feature in Huntington's disease (HD), characterised by movement slowing and performance inaccuracies. This deficit may be exacerbated when visual cues are restricted. OBJECTIVE To characterize the upper limb motor profile in HD with various levels of difficulty, with and without visual targets. METHODS Nine premanifest HD (pre-HD), nine early symptomatic HD (symp-HD) and nine matched controls completed a motor task incorporating Fitts' law, a model of human movement enabling the quantification of movement timing, via the manipulation of task difficulty (i.e., target size, and distance between targets). The task required participants to make reciprocal movements under cued and blind conditions. Dwell times (time stationary between movements), speed, accuracy and variability of movements were compared between groups. RESULTS Symp-HD showed significantly prolonged and less consistent movement times, compared with controls and pre-HD. Furthermore, movement planning and online control were significantly impaired in symp-HD, compared with controls and pre-HD, evidenced by prolonged dwell times and deceleration times. Speed and accuracy were comparable across groups, suggesting that group differences observed in movement time, variability, dwell time and deceleration time were evident over and above simple performance measures. The presence of cues resulted in greater movement time variability in symp-HD, compared with pre-HD and controls, suggesting that the deficit in movement consistency manifested only in response to targeted movements. CONCLUSIONS Collectively, these findings provide evidence of a deficiency in both motor planning, particularly in relation to movement timing and online control, which became exacerbated as a function of task difficulty during symp-HD stages. These variables may provide a more sensitive measure of motor dysfunction than speed and/or accuracy alone in symp-HD.
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Affiliation(s)
- Jessica Despard
- School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Anne-Marie Ternes
- School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Bleydy Dimech-Betancourt
- School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Govinda Poudel
- School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
- Monash Biomedical Imaging, Monash University, Melbourne, Victoria, Australia
- Victorian Life Sciences Computation Initiative, Life Sciences Computation Centre, Melbourne, Victoria, Australia
| | - Andrew Churchyard
- Department of Neurology, Monash Medical Centre, Clayton, Victoria, Australia
| | - Nellie Georgiou-Karistianis
- School of Psychological Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
- * E-mail:
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5
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Rao AK, Marder KS, Uddin J, Rakitin BC. Variability in interval production is due to timing-dependent deficits in Huntington's disease. Mov Disord 2014; 29:1516-22. [PMID: 25154339 DOI: 10.1002/mds.25998] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 06/16/2014] [Accepted: 07/24/2014] [Indexed: 11/08/2022] Open
Abstract
In Huntington's disease (HD), increased variability is seen in performance of motor tasks that require implicit control of timing. We examined whether timing variability was also evident in an explicit interval-timing task. Sixty subjects (21 controls, 19 manifest HD, and 20 pre-manifest HD) performed a single-interval production task with three target intervals (1.1 s, 2.2 s, 3.3 s). We analyzed accuracy (proportional error) and precision (standard deviation) across groups and intervals. No differences were seen in accuracy across groups or intervals. Precision was significantly lower in manifest (P = 0.0001) and pre-manifest HD (P = 0.04) compared with controls. This was particularly true for pre-manifest subjects close to diagnosis (based on probability of diagnosis in 5 years). Precision was correlated with proximity to diagnosis (r2 = 0.3, P < 0.01). To examine the source of reduced precision, we conducted linear regression of standard deviation with interval duration. Slope of the regression was significantly higher in manifest HD (P = 0.02) and in pre-manifest HD close to diagnosis (P = 0.04) compared with controls and pre-manifest participants far from diagnosis. Timing precision is impaired before clinical diagnosis in Huntington's disease. Slope analysis suggests that timing variability (decreased precision) was attributable to deficits in timing-dependent processes. Our results provide additional support for the proposal that the basal ganglia are implicated in central timekeeping functions. Because the single interval production task was sensitive to deficits in pre-manifest HD, temporal precision may be a useful outcome measure in future clinical trials.
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Affiliation(s)
- Ashwini K Rao
- Department of Rehabilitation & Regenerative Medicine (Program in Physical Therapy), and G.H. Sergievsky Center, College of Physicians & Surgeons, Columbia University, New York, New York, USA
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Abstract
Cognition has been well characterized in the various stages of Huntington disease (HD) as well as in the prodrome before the motor diagnosis is given. Although the clinical diagnosis of HD relies on the manifestation of motor abnormalities, the associated impairments have been growing in prominence for several reasons. First, research to understand the most debilitating aspects of HD has suggested that cognitive and behavioral changes place the greatest burden on families, are most highly associated with functional decline, and can be predictive of institutionalization. Second, cognitive impairments are evident at least 15 years prior to the time at which motor diagnosis is given. Finally, cognitive decline is associated with biological markers such as brain atrophy, circulating levels of brain-derived neurotrophic factors, and insulin-like growth factor 1. Efforts are now underway to develop valid and reliable measures of cognition in the prodrome as well as in all stages of HD so that clinical trials can be conducted using cognitive outcomes.
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Affiliation(s)
- Jane S Paulsen
- Departments of Psychiatry, Neurology, Neurosciences, and Psychology, The University of Iowa Roy J. and Lucille A. Carver College of Medicine, Research, Iowa City, IA, 52242-1000, USA.
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7
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Rao AK, Gordon AM, Marder KS. Coordination of fingertip forces during precision grip in premanifest Huntington's disease. Mov Disord 2011; 26:862-9. [PMID: 21394785 DOI: 10.1002/mds.23606] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 11/01/2010] [Accepted: 11/29/2010] [Indexed: 11/06/2022] Open
Abstract
Precision grip control is important for accurate object manipulation and requires coordination between horizontal (grip) and vertical (load) fingertip forces. Manifest Huntington's disease (HD) subjects demonstrate excessive and highly variable grip force and delayed coordination between grip and load forces. Because the onset of these impairments is unknown, we examined precision grip control in premanifest HD (pre-HD) subjects. Fifteen pre-HD and 15 age- and sex-matched controls performed the precision grip task in a seated position. Subjects grasped and lifted an object instrumented with a force transducer that measured horizontal grip and vertical load forces. Outcomes were preload time, loading time, maximum grip force, mean static grip force, and variability for all measures. We compared outcomes across groups and correlated grip measures with the Unified Huntington's Disease Rating Scale and predicted age of onset. Variability of maximum grip force (P < .0001) and variability of static grip force (P < .00001) were higher for pre-HD subjects. Preload time (P < .007) and variability of preload time (P < .006) were higher in pre-HD subjects. No differences were seen in loading time across groups. Variability of static grip force (r(2) = 0.23) and variability of preload time (r(2) = 0.59) increased with predicted onset and were correlated with tests of cognitive function. Our results indicate that pre-HD patients have poor regulation of the transition between reach and grasp and higher variability in force application and temporal coordination during the precision grip task. Force and temporal variability may be good markers of disease severity because they were correlated with predicted onset of disease.
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Affiliation(s)
- Ashwini K Rao
- Program in Physical Therapy, Department of Rehabilitation and Regenerative Medicine, Columbia University Medical Center, New York, New York, USA.
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Klempír J, Klempírová O, Stochl J, Spacková N, Roth J. The relationship between impairment of voluntary movements and cognitive impairment in Huntington's disease. J Neurol 2009; 256:1629-33. [PMID: 19449086 DOI: 10.1007/s00415-009-5164-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Revised: 04/09/2009] [Accepted: 04/27/2009] [Indexed: 10/20/2022]
Abstract
The relationship between motor symptoms and cognitive impairment in Huntington's disease (HD) is still discussed. We analysed 45 HD patients in various stages using Unified Huntington's Disease Rating Scale motor subscale (voluntary and involuntary components were evaluated separately), verbal memory and executive functions tests. Partial correlations controlling for HD duration and age were used to estimate the relationships among factor scores for motor and cognitive impairment. Voluntary components of motor performance were found to be significantly correlated with verbal short-term memory disturbances (r = -0.361, P = 0.03), with tests of executive functions more dependent on motor performance (r = 0.640, P < 0.01) and also with tests of executive functions less dependent on motor performance (r = 0.461, P < 0.01). Involuntary components did not correlate significantly with any part of cognitive performance.
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Affiliation(s)
- Jirí Klempír
- 1st Medical Faculty, Department of Neurology, Charles University, Katerinská 30, 12100 Prague 2, Czech Republic.
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Lemay M, Chouinard S, Richer F, Lesperance P. Huntington's disease affects movement termination. Behav Brain Res 2007; 187:153-8. [PMID: 17980441 DOI: 10.1016/j.bbr.2007.09.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Revised: 08/31/2007] [Accepted: 09/07/2007] [Indexed: 11/17/2022]
Abstract
Huntington's disease (HD) is a neurodegenerative disease affecting the striatum and associated with deficits in voluntary movement in early stages. The final portion of aiming movements is particularly affected in HD and one hypothesis is that this deficit is linked to attention or terminal control requirements. Sixteen patients with early HD and 16 age-matched controls were examined in aiming movements. Four conditions manipulated movement termination requirements (discrete movements with a complete stop vs. cyclical back-and-forth movements) and the presence of flankers around the target. Reducing movement termination requirements significantly attenuated deficits in the final movement phase in patients. The presence of flankers around the target affected the initial portion of movements but did not affect the two groups differentially. These results indicate that terminal control requirements affect voluntary movements in HD. This suggests that frontostriatal systems are involved in movement termination.
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Affiliation(s)
- Martin Lemay
- Centre de Réadaptation Marie-Enfant, Hôpital Ste-Justine, Montréal, QC, Canada.
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Davis JD, Filoteo JV, Kesner RP. Is Short-Term Memory for Discrete Arm Movements Impaired in Huntington's Disease? Cortex 2007; 43:255-63. [PMID: 17405671 DOI: 10.1016/s0010-9452(08)70480-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Explicit memory for arm movements was investigated in patients with Huntington's disease (HD) and normal controls (NC). Participants recalled the end-position of arm movements determined by the examiner following an immediate or a 30-second delay that was either unfilled or filled with a motor distractor task. Movement error was measured in absolute (AE), variable (VE), and constant (CE) error. When performance was measured in AE, HD patients were impaired equally across delays compared to controls, regardless of whether the delay was filled or unfilled. HD patients did not demonstrate a directional bias (i.e., CE), but they were more inconsistent in their reproduction of arm movements (i.e., VE). Both groups were more variable in their reproduction of the movements following the delay, and were most variable when the delay was filled with motor distraction. Results preliminarily suggest that the caudate is specifically involved in the encoding, or temporary storage, of explicit motor information and may be less involved in the short-term retention of newly learned motor information. Results should be viewed somewhat cautiously, however, as the relative contributions of proprioceptive sense and primary motor functioning on task performance were not fully explored.
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Affiliation(s)
- Jennifer D Davis
- Brown Medical School, Rhode Island Hospital, Providence, RI 02903, USA.
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Lemay M, Fimbel E, Beuter A, Chouinard S, Richer F. Sensorimotor mapping affects movement correction deficits in early Huntington's disease. Exp Brain Res 2005; 165:454-60. [PMID: 15875168 DOI: 10.1007/s00221-005-2315-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2004] [Accepted: 02/15/2005] [Indexed: 10/25/2022]
Abstract
Huntington's disease (HD) is associated with early voluntary movement problems linked to striatal dysfunction. In pointing movements, HD increases the irregularity of the terminal part of movements, suggesting a dysfunction in error feedback control. We tested this hypothesis in movements requiring continuous feedback control. Patients in the early stages of HD and controls traced as fast and accurately as possible circles within a 5-mm annulus on a digitizing tablet when visual feedback of the hand and the circle was direct or indirect (through a monitor). Patients deviated more often from the annulus and showed larger corrections toward the circle than controls when using indirect visual feedback but not with direct visual feedback. When velocity requirements were removed, patients showed little change in these control problems. These results suggest that HD does not affect error feedback control in all movements and that the striatal contribution to voluntary movement is sensitive to sensorimotor mapping.
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Affiliation(s)
- M Lemay
- Centre Hospitalier de l'Université de Montréal, Montreal, Canada
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