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Rehabilitation Practice and Science

Translated Title

知覺干擾與反應衝突對P300潛伏期的影響

Abstract

Background: The latency of the P300 component of the event related-potential (ERP) is an index of stimulus classification speed. In this study, we assessed the mental chronometry of stimulus discrimination and decision execution by study the effect of congruence visual stimuli and and compatibility on ERP and reaction time.Methods: The reaction time was divided into two sections based on the peak amplitude of P300. P300 latency was defined as the discrimination time needed to interpret the stimulus. The time from the peak of P300 to the initiation of movement was defined as duration of response selection. We hypothesized that congruency affects stimulus evaluation and that compatibility affects response selection. Subjects (n=13) responded by pressing the buttons under four experimental conditions. The experiments used spatial code-arrow evaluate stimulus discrimination. Results: Congruency and compatibility interact to produce significant effects on reaction time and P300 latency. In addition, the two factors did not have parallel effects on the different stages of the cognitive process. The ERP revealed that compatibility did not have an impact on duration of response selection time. Furthermore, the effect of compatibility on P300 latency was dependent on the congruence of the stimuli. P300 latency showed significant compatibility effect under congruent stimuli. The brain may code for the congruent and incongruent stimuli in different ways during the perceptual process. It seems that a bond may exist between the codes of congruent signals and motor ”Engrams” and that this bond may affect perception and action planning. Conclusions: This bond between the codes of congruent signal and motor ”Engrams” may explain why the P300 latency is longer under incompatible conditions while receiving congruency stimulus. Discrimination interferes with response execution when performing high demand tasks. Moreover, there is a positive association between compatibility and congruency. Further investigations involving different types of stimulus is warranted to look for the general principle of perceptual-cognitive function during information processing.

Language

Traditional Chinese

First Page

237

Last Page

246

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