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Electrophysiological dynamics reveal distinct processing of stimulus‐stimulus and stimulus‐response conflicts
Author(s) -
Li Qi,
Wang Kai,
Nan Weizhi,
Zheng Ya,
Wu Haiyan,
Wang Hongbin,
Liu Xun
Publication year - 2015
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/psyp.12382
Subject(s) - stimulus (psychology) , psychology , stimulus–response compatibility , electrophysiology , neuroscience , cognition , simon effect , cognitive psychology , communication , audiology , medicine
The present study examined electroencephalogram profiles on a novel stimulus‐response compatibility ( SRC ) task in order to elucidate the distinct brain mechanisms of stimulus‐stimulus ( S ‐ S ) and stimulus‐response ( S ‐ R ) conflict processing. The results showed that the SRC effects on reaction times ( RT s) and N 2 amplitudes were additive when both S ‐ S and S ‐ R conflicts existed. We also observed that, for both RT s and N 2 amplitudes, the conflict adaptation effects—the reduced SRC effect following an incongruent trial versus a congruent trial—were present only when two consecutive trials involved the same type of conflict. Time‐frequency analysis revealed that both S ‐ S and S ‐ R conflicts modulated power in the theta band, whereas S ‐ S conflict additionally modulated power in the alpha and beta bands. In summary, our findings provide insight into the domain‐specific conflict processing and the modular organization of cognitive control.