The effects of diazepam on visual-evoked potentials (VEP) have been studied. The general effects - increase in latencies and decrease in amplitudes of the main peaks of the VEP - were differentiated by segmented averaging (as a measure for the possible lack of stationariness of the VEP) and by psychological testing (to study the influence of personality traits on medication effects).
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Böker et al. (2008) studied this question.
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