Tepki doǧruluǧunun tepkiye-kilitli olay-i̇lişkili potansiyellere etkisi

Purpose: To investigate the components in the response-locked event-related potentials (ERPs) that are obtained after correct and incorrect responses, to assess the cognitive correlates of these components, and to find out the validity of the error detection and response competition models. Methods: The study was conducted on 39 healthy volunteers who were matched with respect to age (19-37 years) and education (12 years or more). As a psychometric tool that allows the assesment of correct and incorrect responses, the study utilized the Wisconsin Card Sorting Test (WCST) to obtain ERP components for correct and incorrect responses. Stimulation, recording and analyses were carried using the hardware and software of NeuroScan 4.2. Computerized version of the WCST was used. Continuous EEG recording were taken from 30 electrode locations of the 10/20 system (reference: linked mastoids; ground: forehead) and this was filtered between 0.16-100 Hz (3 dB point, 12 dB octave/slope). Time-locked ERPs were selected from continuous recordings with a pre-response interval of 1024 ms and post-response interval of 1022 ms; this epoch was also used for base-line correction. Sampling rate was 500 Hz. Bipolar recordings were made for monitoring eye movements. Findings: The ERPs were principally obtained from the frontocentral recording sites. For both the correct and incorrect responses, they included a negative component (N1 and N2 peaks) and a positive component (P3 and P4 peaks). Statistical analysis showed that P3 was a motoric component. P4 was the only component that showed an effect of response correctness; there was a significant difference between the amplitudes of the P4's that were recorded after the correct and incorrect responses. Discussion and Conclusions: The findings supported the response competition model and refuted the error detection model. The findings for P4 indicated that this component may be the electrophysiological representation of meta-cognitive processes.