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Anastasopoulou I, Cheyne DO, van Lieshout P, Johnson BW. Decoding kinematic information from beta-band motor rhythms of speech motor cortex: a methodological/analytic approach using concurrent speech movement tracking and magnetoencephalography. Front Hum Neurosci 2024; 18:1305058. [PMID: 38646159 PMCID: PMC11027130 DOI: 10.3389/fnhum.2024.1305058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 02/26/2024] [Indexed: 04/23/2024] Open
Abstract
Introduction Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until now, however, it has generally not been feasible to use both in the same experimental setup because of technical incompatibilities between the two methodologies. Methods Here we describe results from a novel articulography system dubbed Magneto-articulography for the Assessment of Speech Kinematics (MASK), which is technically compatible with magnetoencephalography (MEG) brain scanning systems. In the present paper we describe our methodological and analytic approach for extracting brain motor activities related to key kinematic and coordination event parameters derived from time-registered MASK tracking measurements. Data were collected from 10 healthy adults with tracking coils on the tongue, lips, and jaw. Analyses targeted the gestural landmarks of reiterated utterances/ipa/ and /api/, produced at normal and faster rates. Results The results show that (1) Speech sensorimotor cortex can be reliably located in peri-rolandic regions of the left hemisphere; (2) mu (8-12 Hz) and beta band (13-30 Hz) neuromotor oscillations are present in the speech signals and contain information structures that are independent of those present in higher-frequency bands; and (3) hypotheses concerning the information content of speech motor rhythms can be systematically evaluated with multivariate pattern analytic techniques. Discussion These results show that MASK provides the capability, for deriving subject-specific articulatory parameters, based on well-established and robust motor control parameters, in the same experimental setup as the MEG brain recordings and in temporal and spatial co-register with the brain data. The analytic approach described here provides new capabilities for testing hypotheses concerning the types of kinematic information that are encoded and processed within specific components of the speech neuromotor system.
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Affiliation(s)
| | - Douglas Owen Cheyne
- Department of Speech-Language Pathology, University of Toronto, Toronto, ON, Canada
- Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - Pascal van Lieshout
- Department of Speech-Language Pathology, University of Toronto, Toronto, ON, Canada
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Anastasopoulou I, van Lieshout P, Cheyne DO, Johnson BW. Speech Kinematics and Coordination Measured With an MEG-Compatible Speech Tracking System. Front Neurol 2022; 13:828237. [PMID: 35837226 PMCID: PMC9273948 DOI: 10.3389/fneur.2022.828237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 06/06/2022] [Indexed: 11/13/2022] Open
Abstract
Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until recently, however, it has generally not been possible to use both in the same experimental setup because of technical incompatibilities between the two methodologies. Here we describe results from a novel articulography system dubbed Magneto-articulography for the Assessment of Speech Kinematics (MASK), which we used to derive kinematic profiles of oro-facial movements during speech. MASK was used to characterize speech kinematics in two healthy adults, and the results were compared to measurements from a separate participant with a conventional Electromagnetic Articulography (EMA) system. Analyses targeted the gestural landmarks of reiterated utterances /ipa/, /api/ and /pataka/. The results demonstrate that MASK reliably characterizes key kinematic and movement coordination parameters of speech motor control. Since these parameters are intrinsically registered in time with concurrent magnetoencephalographic (MEG) measurements of neuromotor brain activity, this methodology paves the way for innovative cross-disciplinary studies of the neuromotor control of human speech production, speech development, and speech motor disorders.
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Affiliation(s)
- Ioanna Anastasopoulou
- School of Psychological Sciences, Macquarie University, Sydney, NSW, Australia
- *Correspondence: Ioanna Anastasopoulou
| | - Pascal van Lieshout
- Department of Speech-Language Pathology, University of Toronto, Toronto, ON, Canada
| | - Douglas O. Cheyne
- Department of Speech-Language Pathology, University of Toronto, Toronto, ON, Canada
- Hospital for Sick Children Research Institute, Toronto, ON, Canada
| | - Blake W. Johnson
- School of Psychological Sciences, Macquarie University, Sydney, NSW, Australia
- Blake W. Johnson
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Alevizopoulos A, Tyritzis S, Leotsakos I, Anastasopoulou I, Pournaras C, Kotsis P, Katsarou O, Alamanis C, Stravodimos K, Constantinides C. Role of coagulation factors in urological malignancy: A prospective, controlled study on prostate, renal and bladder cancer. Int J Urol 2016; 24:130-136. [PMID: 28004432 DOI: 10.1111/iju.13271] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 11/08/2016] [Indexed: 01/12/2023]
Abstract
OBJECTIVES To study the behavior of specific coagulation factors in different types of non-metastatic urological cancers, and to identify their possible role as diagnostic and prognostic markers. METHODS This was a prospective controlled study, which included three cancer patient groups and a control group of healthy individuals. The cancer subgroups consisted of renal (n = 44), prostate (n = 56) and bladder cancer (n = 47). We excluded patients receiving anticoagulant therapy, or with significant comorbidity. In all patients, certain coagulation parameters were measured (prothrombin time, international normalized ratio, partial thromboplastin time, D-dimers, fibrinogen, F1 + 2, thrombin-antithrombin complex). Statistical analysis was carried out to explore the association of hemostasis markers with tumor-nodes-metastasis stage, Gleason score, transitional cell carcinoma grade, Fuhrman grade and prostate-specific antigen. RESULTS Our final sample consisted in 58 control patients and 147 patients with urological cancer. We found specific patterns of increased coagulation factors in the different cancers that were statistically significant. Renal cancer showed increased levels of D-dimers, partial thromboplastin time and fibrinogen. D-dimers and fibrinogen were increased in prostate cancer; whereas in bladder cancer, only fibrinogen was elevated. Correlations were found between certain factors and tumor stage and grading, with D-dimers being independently associated with higher tumor grade. Thrombin-antithrombin complex was associated with Gleason score. Furthermore, D-dimers, fibrinogen and F1 + 2 were associated with higher tumor stages (II-IV). CONCLUSIONS The coagulation pathway seems to be activated in urological malignancies. Specific panels of coagulation factors might play a role as screening or prognostic tools in earlier stages of renal, prostate and bladder cancer. Further research should also focus on their role in the association of cancer with thromboembolic events.
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Affiliation(s)
| | - Stavros Tyritzis
- Section of Urology, Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.,Center for Minimally Invasive Urological Surgery, Athens Medical Center, Athens, Greece
| | - Ioannis Leotsakos
- Facharzt fur Urologie, Diakonissenkrankenhaus Flensburg, Flensburg, Germany
| | - Ioanna Anastasopoulou
- Blood Transfusion Center, National Reference Center for Congenital Bleeding Diseases, Laiko General Hospital, Athens, Greece
| | - Christos Pournaras
- 1st University Department of Urology, Laiko General Hospital, National and Kapodistrian Athens University, Athens, Greece
| | - Paraskevi Kotsis
- Blood Transfusion Center, National Reference Center for Congenital Bleeding Diseases, Laiko General Hospital, Athens, Greece
| | - Olga Katsarou
- Blood Transfusion Center, National Reference Center for Congenital Bleeding Diseases, Laiko General Hospital, Athens, Greece
| | - Christos Alamanis
- 1st University Department of Urology, Laiko General Hospital, National and Kapodistrian Athens University, Athens, Greece
| | - Konstantinos Stravodimos
- 1st University Department of Urology, Laiko General Hospital, National and Kapodistrian Athens University, Athens, Greece
| | - Constantinos Constantinides
- 1st University Department of Urology, Laiko General Hospital, National and Kapodistrian Athens University, Athens, Greece
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Karafoulidou A, Suarez E, Anastasopoulou I, Katsarou O, Kouramba A, Kotsi P, Zografidis A, Lukas JC. Population pharmacokinetics of recombinant factor VIII:C (ReFacto) in adult HIV-negative and HIV-positive haemophilia patients. Eur J Clin Pharmacol 2009; 65:1121-30. [PMID: 19641914 DOI: 10.1007/s00228-009-0699-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Accepted: 07/03/2009] [Indexed: 11/24/2022]
Abstract
PURPOSE The aim of this study was to explore possible differences in the pharmacokinetics (PK) of recombinant factor VIII:C (ReFacto - ReFacto ) in HIV+ vs. HIV- patients and also differences in the chromogenic substrate bioassay (CHS) and one-stage clotting (OSC) methods. METHODS Twenty-eight haemophilia A adults (20 HIV- and eight HIV+) were assayed with both the CHS and OSC methods. An average of two and six samples were collected per patient for HIV-/+, respectively, after one, and occasionally two more, prophylactic doses (mean 2,003 IU; range 1,000-4,300 IU). The observations were analysed with the mixed-effects (population) compartmental PK modelling package NONMEM (nonlinear mixed-effects modelling) and the FOCE (first-order conditional estimation) method. Base modelling was performed independently for the CHS and OSC bioassays for comparison, and covariate models and simulation tests were done only for the commonly used OSC bioassay. The final covariate model was validated using the bootstrap method. Monte Carlo simulations were used to estimate the expected probability of exceeding 20%, 40% or 60% of normal factor VIII:C in plasma after a single dose, corresponding to required levels for preventing mild, moderate and life-threatening haemorrhages. RESULTS One-compartment base-model population PK parameters were [mean parameter (interpatient variability %)] for CHS: clearance (CL) = 2.56 dl h(-1) (33.2%); volume of distribution (V) = 34.8 dl (12.8%); and for OSC: CL = 3.83 dl h(-1) (47.8%), V = 53.7 dl (22.4%). The volumes differed significantly between the CHS and OSC methods (p < 0.0001), and variabilities were higher for OSC. Nevertheless, the empirical half-lives (t(1/2) = l n (2) x V/CL) were similar for CHS and OSC, [(mean +/- standard deviation (SD)], 9.5 +/- 3 h and 10.2 +/- 4 h, respectively. In covariate modelling with the OSC-derived model, HIV status (VIR) was a significant categorical predictor (p < 0.005) for V. The final covariate models with OSC were for CL = 3.93 + 0.09 x (WT-75) and for V = 48.6 x (1 + 0.36 x VIR) + 0.55 x (WT-75); therefore, V for the typical HIV+ patient was 36% higher than for the HIV- patient. CONCLUSIONS Both HIV- and HIV+ patients showed 100% success with the 20% threshold at doses >20 IU/kg. HIV- patients receiving >50 IU/kg had a 100% expected chance of success for all thresholds. HIV+ patients for moderate or life-threatening haemorrhage treatment need 10 IU/kg more than the HIV- patient equivalent to have the same probability of success.
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Affiliation(s)
- Anastasia Karafoulidou
- 2nd Blood Transfusion Center, Haemophilia Center, Laikon General Hospital, Athens, Greece
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Kouramba A, Anastasopoulou I, Laiou E, Kotsi P, Tsoucala C, Katsarou O, Karafoulidou A. CONTRIBUTION OF ROTATION THROMBOELASTOGRAPHY (RT) IN PERIOPERATIVE MANAGEMENT OF PATIENTS WITH GLAZMANN'S THROMBASTHENIA (GT). J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb01118.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tentolouris N, Boutati E, Karambakalis N, Perrea D, Tselepis AD, Tsoukala C, Kyriaki D, Lourida E, Anastasopoulou I, Karafoullidou A, Raptis SA, Katsilambros N. Acute nateglinide administration in subjects with type 2 diabetes: effects on postprandial metabolism, coagulation, and fibrinolysis. Nutr Metab Cardiovasc Dis 2005; 15:6-12. [PMID: 15871845 DOI: 10.1016/j.numecd.2004.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2004] [Revised: 06/18/2004] [Accepted: 06/18/2004] [Indexed: 11/26/2022]
Abstract
BACKGROUND AND AIM Postprandial glycaemia and lipaemia are known risk factors for atherosclerosis in type 2 diabetes. Coagulation activation in the postprandial state also contributes to acceleration of atherosclerosis. Nateglinide is effective in reducing postprandial glycaemia. Its effect on glycaemia may also be beneficial in postprandial lipaemia and coagulation. The aim of this study was to examine the potential effect of a single dose of nateglinide on postprandial triglyceridaemia, coagulation, and fibrinolysis in patients with type 2 diabetes. METHODS AND RESULTS Ten subjects with type 2 diabetes, treated with diet alone were recruited in a crossover randomized study. In the morning, after a 12- to 14-h fast, each subject received a standard mixed meal (total energy 783 kcal), preceded by one tablet of 120 mg nateglinide or placebo. Venous blood samples were drawn prior to meal consumption and 6h afterwards for the measurement of plasma glucose, insulin, and C-peptide, lipids, coagulation, and fibrinolysis factors. As expected, there was a significant reduction in postprandial glycaemia after nateglinide administration compared to placebo (P<0.001). Plasma insulin levels were significantly higher after nateglinide than after placebo (P=0.002). Nateglinide administration resulted in a lower overall postprandial reduction of tissue-plasminogen activator than placebo (-2.9+/-1.3 vs. -8.3+/-3.7 ng/ml h, P=0.003). In addition, a significant reduction of postprandial plasminogen activator inhibitor-1 was observed in comparison with the baseline values after nateglinide (P=0.001), although the overall response was not significantly different after nateglinide and placebo (P=0.31). Plasma concentrations of C-peptide, lipids and the remaining coagulation parameters studied were not different between nateglinide and placebo. CONCLUSIONS Acute nateglinide administration improves postprandial glycaemia and fibrinolytic activity in patients with type 2 diabetes. This combined effect, if confirmed by a long-treatment study, might reduce cardiovascular risk in type 2 diabetes.
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Affiliation(s)
- N Tentolouris
- First Department of Propaedeutic Medicine, Laiko Hospital, Athens University Medical School, Athens, Greece
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