Abstract：
:The prefrontal cortex (PFC) plays a central role in preparatory and anticipatory attentional processes. To investigate whether subregions of the PFC play differential roles in these processes we investigated the effect of focal lesions to either lateral prefrontal (lateral PFC; n=11) or orbitofrontal cortex (OFC; n=13) on the contingent negative variation (CNV), an electrophysiological index of preparatory brain processes. The CNV was studied using a Go/NoGo delayed response task where an auditory S1 signaled whether or not an upcoming visual S2 was a Go or a NoGo stimulus. Neither early (500-1000 ms) nor late (3200-3700 ms) phase Go trial CNV amplitude was reduced for any of the patient groups in comparison to controls. However, the lateral PFC group showed enhanced Go trial early CNV and reduced late CNV Go/NoGo differentiation. These data suggests that normal orienting and evaluation as reflected by the CNV is intact after OFC lesions. The enhanced early CNV after lateral PFC damage may be due to failure in inhibition and the reduced late CNV difference wave confirms a deficit in preparatory attention after damage to this frontal subregion.
journal_name
Brain Resjournal_title
Brain researchauthors
Funderud I,Løvstad M,Lindgren M,Endestad T,Due-Tønnessen P,Meling TR,Knight RT,Solbakk AKdoi
10.1016/j.brainres.2013.06.017subject
Has Abstractpub_date
2013-08-21 00:00:00pages
174-88eissn
0006-8993issn
1872-6240pii
S0006-8993(13)00868-8journal_volume
1527pub_type
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