<論文>図形の背景の明度差が視覚誘発電位に及ぼす影響

概要

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As an attempt of the psychophysiological study on the visual phenomenon, influences of the difference of value in achromatic color patches between the figure and its background upon visual evoked potentials (VEPs) were examined with five subjects. A square figure which was different from the background in respect of value relations was successively presented with the tachistoscope. Transient VEPs were obtained from Oz in the international 10-20 system in both positive and negative changes of the difference of value and each of the corresponding waves was averaged. Then subtracted waves were calculated between the condition of the difference of value and the control condition (no difference of value). Three VEP components (P_1, N_1, P_2) were identified. The main results were as follows: as the difference of value increased, peak latencies of each component gradually shortened. As to the measures of P_1-N_1 and N_1-P_2 amplitude, they showed almost no increase as the function of the difference of value, although a slight increase was found in the latter. The relationship between the present results based on the operation of the difference of value and previous results by other researchers based on the operation of the objective contrast was considered. In addition, several other related matters were discussed.
愛知学院大学の論文