Quantitative analysis of visual evoked potential for isoluminant color combinations stimuli—Response differences between sinusoidal and square patterns—

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  • 等輝度色フリッカー刺激を用いた視覚誘発電位の定量解析—正弦波パターンと矩形波パターンによる反応性の相違—
  • 等輝度色フリッカー刺激を用いた視覚誘発電位の定量解析 : 正弦波パターンと矩形波パターンによる反応性の相違
  • トウ キドショク フリッカー シゲキ オ モチイタ シカク ユウハツ デンイ ノ テイリョウ カイセキ : セイゲンハ パターン ト クケイハ パターン ニ ヨル ハンノウセイ ノ ソウイ

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Abstract

[Objective] We quantitatively evaluated the influences of the stimulus pattern and the color combination for visual evoked potentials (VEPs).<br>[Method] Steady-state VEPs were recorded from 11 healthy young adults (aged 21–24). Two isoluminant color combinations (red/blue (R/B) and red/green (R/G)) and two stimulus patterns (sinusoidal (Sin.) and square (Sq.) pattern) were combined for constructing the visual target. Temporal frequencies of 4–18 Hz were used. Amplitude of first harmonic and second harmonic components were defined as characteristic parameters. Difference of those parameters between two stimulus conditions were also evaluated.<br>[Result] VEP amplitudes were gradually increased according to the temporal frequency increased from 7–10 Hz, and were more remarkable for Sin. than for Sq. VEP amplitudes on R/B were larger than that of R/G in temporal frequency of 12–18 Hz. Difference of VEP amplitudes between R/B Sin. and R/B Sq. were Sin. dominance, especially of temporal frequency of 9 Hz.<br>[Discussion] Difference of response between stimulus patterns was supposed to be derived from the intensity of color change. The influence of the antagonistic effects in primary visual cortex was taken into account the reason for the difference of VEP responses between color combinations. Characteristic of response for each stimulus condition depends on interaction of the effect of stimulus patterns and that of color combinations.

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