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Rehabilitation Practice and Science

Translated Title

正常人之視覺空間注意力事件誘發電位

Abstract

Visual attention can be manipulated by temporal and spatial factors of stimuli. The purpose of this study is to investigate the underlying mechanism of visual spatial attention of healthy subjects through event-related potential (ERP) study.The subjects of the study were 17 healthy adults, mean age 23.3 years. The visual stimuli were generated by the Neurostim system and presented in groups of eight under three different conditions: cueing (valid, invalid), delay (100 ms, 800 ms) and visual field sides (right and left). ERPs were recorded by 10 Neuroscan systems electrodes placed on each subject's scalp. The latencies and amplitudes of ERPs were then analyzed. Repeated measures ANOVA was used to compare ERPs resulting from different conditions. The difference in measurements was considered significant if P ＜0.05. Brain mapping was obtained to recognize the ERP topography in each condition. Three different ERPs, Nl (170-180ms, -2~-4µV), P2(250-260 ms, 4-6µV), and P3 (370-380 ms, 3-4µV), were elicited during the visual spatial attention task. Ni wave distribution was higher in contralateral occipital and parietal lobes. P2 wave distribution was higher in contralateral occipital and parietal lobes, frontal lobes, and central areas. P3 wave distribution was higher in frontal lobes and central brain areas. Ni and P2 amplitudes were greater during contralateral invalid-cue stimuli presentations, however, P3 amplitudes were greater during contralateral valid-cue stimuli presentation. Our findings suggest that invalid-cue stimuli may elicit greater attention, resulting in higher cortical activity in contralateral occipital and parietal lobes. The valid-cue stimuli may induce a higher cognitive processing produced by ”processing negativity.”

Language

Traditional Chinese

First Page

19

Last Page

28

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