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Abstract:
Abstract: Lesions to the frontal lobe often result in
self-regulation deficits. Experimental studies have shown that the
frontal lobe is important in a host of executive functions,
including short-term memory, error monitoring, and behavioral
inhibition. In this study, we used dense- array EEG to study the
frontal lobe's involvement in response switching. Subjects
performed the Eriksen flanker task in which a maximum of three
consecutive responses with the same hand were permitted. We
analyzed the trials in which the third response was either
consistent with the previous two responses or required switching of
response hand. It was found that when subjects are required to
switch from a previously primed response hand to the opposite hand,
there is a contralateral, orbitofrontal negativity. In comparison,
when subjects are not required to switch the hand of response, no
asymmetric frontal negativities were observed. We conclude that the
frontal negativity indexes frontal lobe mechanisms involved in
response inhibition and switching.
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