Event-related potentials associated with correct and incorrect responses in a cued antisaccade task

Experimental Brain Research
Stefan EverlingH Flohr

Abstract

In an antisaccade task, subjects are instructed to inhibit a reflexive saccade towards a peripheral stimulus flash and to generate a saccade in the opposite direction. It has been shown recently that normal subjects will generate a high number of incorrect prosaccades in an antisaccade task if the fixation point is extinguished 200 ms before the stimulus appears and if a valid cue for the subsequent antisaccade is given during this gap period. In the present study we recorded cerebral event-related potentials from 19 scalp electrodes from normal subjects prior to correct and incorrect responses in a cued antisaccade task to investigate the neural processes associated with correct antisaccades and incorrect prosaccades in this task. Correct antisaccades and incorrect prosaccades were associated with a negative potential with a maximal amplitude around stimulus onset over the dorsomedial frontal cortex. This potential was higher prior to correct antisaccades than prior to incorrect prosaccades. The execution of a correct antisaccade was preceded by a shift of a negative potential from the parietal hemisphere contralateral to the visual stimulus towards the parietal hemisphere ipsilateral to the stimulus. These results support the...Continue Reading

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