Spectral sensitivity of the visual system as revealed by evoked potentials in normal and anomalous trichomats.

E Yankov, A Nakova, R Tzekov
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Abstract

The spectral sensitivity of the visual system upon adaptation by white light at intensity of 10,500 td was studied in Maxwellian view. The monochromatic stimuli had a size of 8 degrees and duration of 700 ms. They were superimposed on an adaptation field of 14 degrees. The spectral sensitivity was determined by the off-VEP amplitude measured from the negative peak with a latency of 75-80 ms to the positive peak with a latency of 100-110 ms. The EEG was led off monopolarly from the occipital scalp area. Eight normal trichomats, 2 protanomalous and 2 deuteranomalous subjects were investigated. Some specificity of the spectral sensitivity curve, determined by the VEP amplitude, were studied. Special attention was placed on the sensitivity decrease between lambda = 550 nm and lambda = 590 nm, which was much pronounced in the normal trichomats. Maximum sensitivity was observed at lambda = 527 nm. The sensitivity at lambda = 578 nm was lower than the maximum one by 0.8 logarithmic units or more. It is assumed that this sensitivity decrease is a manifestation of opponency between the middle wavelength and long wavelength mechanisms. In the anomalous trichomats the sensitivity decrease between lambda = 550 nm and lambda = 590 nm was much less pronounced. Maximum sensitivity was obtained at lambda = 551 nm. In the long wavelength range of the spectrum the deuteranomalous subjects showed a higher sensitivity as compared to the protanomalous ones. The obtained results suggest disturbances of color opponency in the anomalous trichomats.

正常和异常滴虫的诱发电位所揭示的视觉系统的光谱敏感性。
在麦克斯韦视域下研究了10500 td白光对视觉系统适应后的光谱灵敏度。单色刺激的大小为8度,持续时间为700毫秒。它们被叠加在14度的适应场上。光谱灵敏度由潜伏期为75 ~ 80 ms的负峰到潜伏期为100 ~ 110 ms的正峰测量的off-VEP振幅来确定。脑电图单从枕部头皮区域开始。8例正常滴虫,2例原异滴虫,2例后异滴虫。研究了由VEP振幅决定的光谱灵敏度曲线的特异性。特别注意在λ = 550 nm和λ = 590 nm之间的灵敏度下降,这在正常滴虫中非常明显。在λ = 527 nm处观察到最大灵敏度。λ = 578 nm处的灵敏度比最大值低0.8个对数单位以上。我们认为这种灵敏度的降低是中波长和长波长机制对立的表现。在异常滴虫中,λ = 550 nm和λ = 590 nm之间的敏感性下降不明显。在λ = 551 nm处获得最大灵敏度。在光谱的长波长范围内,后异常受试者比原异常受试者表现出更高的灵敏度。所得结果表明,异常滴虫的颜色对抗性受到干扰。
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