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Abstract:
Abstract: Executive control has been invoked to explain the
human performance when a plan is demanded, in error detection,
novelty situations, if there is a response conflict or if difficult
processing is demanded. This paper is concerned with the study of
the implementation of this executive mechanism in the human brain.
We recorded the EEG to 20 psychology students while they went over
a Go-No Go task in a spatial attention cueing paradigm (SOA = 600
ms, peripheralnon-predictive cue). There was 33% of no go trials.
In the no go condition the participants must inhibit the most
frequent "Go" response. This paradigm allows us to analyze the
interaction of executive and orienting processes. The results show
the effects of orienting (valid vs. invalid trials differences) at
around 150 ms after the no go target, at parieto-occipital areas.
Go targets differ from no go targets (executive processes) around
232-296 ms at prefrontal areas. Our pattern of results is
compatible with less activation at prefrontal areas when it is
needed the inhibition of a response toward a no go target that
appeared at an attended location.
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