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Attentional capture by visual singletons is mediated by top‐down task set: New evidence from the N2pc component
Author(s) -
Kiss Monika,
Jolicœur Pierre,
Dell'Acqua Roberto,
Eimer Martin
Publication year - 2008
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/j.1469-8986.2008.00700.x
Subject(s) - n2pc , visual search , psychology , singleton , stimulus (psychology) , salient , cognitive psychology , task (project management) , set (abstract data type) , top down and bottom up design , visual attention , communication , cognition , neuroscience , artificial intelligence , computer science , management , software engineering , pregnancy , biology , economics , genetics , programming language
To investigate whether attentional capture by salient visual stimuli is mediated by current task sets, we measured the N2pc component as a marker of the spatial locus of visual attention during visual search. In each trial, a singleton stimulus that could either be a target (color task: red circle; shape task: green diamond) or a nontarget (blue circle or green square) was presented among uniform distractors (green circles). As predicted by the view that attentional capture is contingent on task set, the N2pc was strongly affected by task instructions. It was maximal for targets, attenuated but still reliably present for nontarget singletons defined in the target dimension (even when these were accompanied by an irrelevant‐dimension singleton), and small or absent for equally salient irrelevant‐dimension singletons. Results demonstrate that attentional capture is not a purely bottom‐up phenomenon, but is strongly determined by top‐down task set.