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Late Components of Auditory Event‐Related Potentials to Eight Equiprobable Stimuli in a Target Detection Task
Author(s) -
McCallum W.C.,
Barrett K.,
Pocock P.V.
Publication year - 1989
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.1469-8986.1989.tb03172.x
Subject(s) - audiology , psychology , event related potential , scalp , negativity effect , auditory event , tone (literature) , mismatch negativity , electroencephalography , late positive component , contingent negative variation , latency (audio) , electrophysiology , task (project management) , communication , neuroscience , cognition , developmental psychology , medicine , anatomy , computer science , art , telecommunications , literature , management , economics
Fourteen normal subjects undertook a target detection task in which eight different but equiprobable stimuli were presented in an unpredictable sequence (four tone frequencies to either the left or the right ear). One tone/ear combination was designated as a target, to be responded to with a rapid button press. Event‐related potentials were recorded from an array of six scalp electrodes. In Condition 1 no responses were required; in Condition 2 a response was required to the highest tone in one designated ear; in Condition 3 a response was required to the second highest tone in the ear opposite to the Condition 2 target. Event‐related potentials to the no‐task condition (1) included a P3‐type late positive component. P3 increased in amplitude to target tones in Conditions 2 and 3, but showed equally large amplitude increases and some decrease in latency to nontarget tones in those conditions. However, a frontal Slow Wave component was elicited more specifically by target stimuli. An attended ear effect was evident in a processing negativity that extended for some hundreds of milliseconds prefrontally, but tended to be comprised of two separate negativities over fronto‐central locations.