1. İŞİTSEL ÜÇLÜ UYARAN PARADİGMASINDAKİ YENİ UYARANLARIN P3B POTANSİYELİ ÜZERİNE ETKİLERİ.
- Author
-
Ergenoglu, Tolgay, Ertürk, Fazilet, Dag, Figen, Maraşlıgil, Berrin, and Sungur, Mehmet Ali
- Subjects
- *
STIMULUS & response (Biology) , *EVOKED potentials (Electrophysiology) , *ELECTROPHYSIOLOGY , *ANALYSIS of variance , *MEDICAL geography , *AUDITORY perception - Abstract
Objective: The P3 potential is the most studied event-related potential (ERP) component in cognitive electrophysiology. Two subtypes of P3 potentials are well known, P3a and P3b. The P3a potential occurring in response to non-target, novels has a more centro-frontal topography in contrast to the parietal P3b of the target responses in the three-stimulus (novelty) paradigm. The P3a potential is assumed to reflect passive, involuntary switching of attention or orienting, while P3b potential is related to selective attention and memory updating processes. The aim of this study is to investigate the effects of novel stimuli on the ERP responses to target stimuli, especially P3b component, in auditory three-stimulus paradigm. Material and Method: ERPs were recorded via 30 electrodes with auditory three-stimulus paradigm from fifteen healthy volunteers. Intervals between novel and target stimuli were randomly varying among 4, 6, and 10 s. Also, for each novel-to-target interval groups' target-to-target intervals were randomly varying among 14, 16, and 18 s with a mean value of 15.8 s. The amplitude and latency of ERP responses to target stimuli in each interval group were measured and analyzed by repeated measures analyses of variance (ANOVA). Results: The amplitudes of N1 and N2 potential were significantly different among the novel-to-target intervals (p<0.05). However, there were no significant differences in amplitudes and latencies of P3b among the intervals groups (p>0.05). Conclusion: Our results suggest that time-based localization changes of novel stimuli between two target stimuli do not affect the P3b response. [ABSTRACT FROM AUTHOR]
- Published
- 2013