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Electrophysiological correlates of anticipatory and poststimulus components of task switching
Author(s) -
Karayanidis Frini,
Coltheart Max,
Michie Patricia T.,
Murphy Karen
Publication year - 2003
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/1469-8986.00037
Subject(s) - task switching , psychology , stimulus (psychology) , electrophysiology , cognition , negativity effect , latency (audio) , neuroscience , audiology , interval (graph theory) , task (project management) , cognitive psychology , developmental psychology , computer science , mathematics , management , combinatorics , economics , medicine , telecommunications
Task‐switching paradigms can shed light on cognitive and neural processes underlying attentional control mechanisms. An alternating runs task‐switching paradigm (R. D. Rogers & S. Monsell, 1995) is used to identify ERP components associated with anticipatory and poststimulus components of task‐switching processes. Subjects alternated between two tasks in a predictable series (AABB). Reaction time (RT) switch cost reduced with increasing response‐stimulus (R‐S) interval and a residual switch cost remained at the longest R‐S interval. A switch‐related positivity (D‐Pos) developed in the R‐S interval. D‐Pos was time‐locked to response onset, peaked around 400 ms post‐response onset, and was unaffected by task‐set interference. A switch‐related negativity (D‐Neg) emerged after stimulus onset. D‐Neg peaked earlier with increasing R‐S interval and its amplitude and latency were affected by task‐set interference. D‐Pos and D‐Neg were interpreted within current models of task‐switching.