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Multi‐Site Phasic Neural Activity Mediates the Execution of An Auditory Continuous Performance Task: A PET and Electrophysiological Study
Author(s) -
Lockwood Alan H.,
Wack David S.,
Benedict Ralph H. B.,
Coad Mary Lou,
Sussman Joan E.,
Burkard Robert F.
Publication year - 2008
Publication title -
journal of neuroimaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.822
H-Index - 64
eISSN - 1552-6569
pISSN - 1051-2284
DOI - 10.1111/j.1552-6569.2007.00196_1.x
Subject(s) - statistical parametric mapping , posterior cingulate , electrophysiology , neuroscience , medicine , electroencephalography , anterior cingulate cortex , auditory cortex , brain activity and meditation , cognition , audiology , psychology , magnetic resonance imaging , radiology
BACKGROUND AND PURPOSE We studied an auditory continuous performance task with positron emission tomography (PET) and EEG‐derived current density reconstructions (CDRs) to define the spatial and temporal aspects of auditory attention.METHODS The CDRs were employed to segregate responses to targets and non‐targets at sites identified by PET. We then studied the time course of brain activity using statistical parametric mapping (SPM) of the CDR data.RESULTS In contrast to target EEG activity, non‐targets did not produce significant peaks after 300 ms. Pre‐300 ms biphasic activation of auditory, left posterior frontal, left supplemental, and primary motor cortices and the anterior cingulate (AC) and biphasic suppression of posterior cingulate and occipital cortex were identical for targets and non‐targets and may mediate the target non‐target decision. SPM analysis of post‐300 ms CDRs showed cingulate cortices were the first to be reactivated, remained active through 672 ms, and were accompanied by reactivation and deactivation of the same sites observed in the pre‐P300 responses.CONCLUSIONS The cingulate may play an important role in post‐decisional activity and control activity at other sites involved in post‐decisional cognitive processing.