Identifying Differences in the P600 Component of ERP-Signals between OCD Patients and Controls Employing a PNN-based Majority Vote Classification Scheme
| Autor: | N. Piliouras, Dionisis Cavouras, Constantin R. Soldatos, D. Glotsos, E. Ventouras, I. Kalatzis, Andreas D. Rabavilas, Charalambos Papageorgiou |
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| Rok vydání: | 2007 |
| Předmět: |
medicine.medical_specialty
P600 medicine.diagnostic_test Working memory Neuropsychology Wechsler Adult Intelligence Scale Audiology Electroencephalography behavioral disciplines and activities humanities Developmental psychology Probabilistic neural network Event-related potential medicine Memory span Psychology |
| Zdroj: | Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference. 2005 |
| ISSN: | 1557-170X |
| Popis: | In the present study an attempt was made to focus in the differences between Obsessive-Compulsive Disorder (OCD) patients and healthy controls, as reflected by the P600 component of event-related potential (ERP) signals, to locate brain areas that may be related to Working Memory (WM) deficits. Neuropsychological research has yielded contradicting results regarding WM in OCD. Eighteen patients with OCD symptomatology and 20 normal controls (age and sex matched) were subjected to a computerized version of the digit span Wechsler test. EEG activity was recorded from 15 scalp electrodes (leads). A dedicated computer software was developed to read the ERP signals and to calculate features related to the ERP P600 component (500-800 ms). Nineteen features were generated, from each ERP-signal and each lead, and were employed in the design of the Probabilistic Neural Network (PNN) classifier. Highest single-lead precision (86.8%) was found at the Fp2 and C6 leads. When the output from all single-lead PNN classifiers fed a Majority Vote Engine (MVE), the system classified correctly all subjects, providing a powerful classification scheme. Findings indicated that OCD patients differed from normal controls at the prefrontal and temporo-central brain regions. |
| Databáze: | OpenAIRE |
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