Schwartz S H, Godwin L D
Department of Biomedical Sciences, Southern College of Optometry, Memphis, TN 38104, USA.
Vision Res. 1996 Jun;36(11):1551-9. doi: 10.1016/0042-6989(95)00231-6.
Brief (10 msec) increments, presented on a white adapting background, are known to elicit a spectral sensitivity function with a broad mid-spectral peak (King-Smith & Carden, 1976). We have found that a luminance decrement, presented as either a forward or backward mask, dramatically alters the form of the resultant sensitivity function: the broad mid-spectral peak is replaced by a color-opponent function with narrow peaks at 520 and 620 nm. Over the region of the spectrum where this change in shape occurs, there is a substantial reduction in sensitivity. We also find that the mask is more effective when it precedes the stimulus than when it follows it, and that the masking can be characterized as a type A effect. The implications of these data for mechanisms of saccadic suppression are discussed.
已知在白色适应背景上呈现的短暂（10毫秒）增量会引发具有宽中光谱峰值的光谱灵敏度函数（King-Smith和Carden，1976）。我们发现，作为前向或后向掩蔽呈现的亮度递减会显著改变所得灵敏度函数的形式：宽中光谱峰值被在520和620纳米处具有窄峰的颜色对立函数所取代。在发生这种形状变化的光谱区域内，灵敏度有大幅降低。我们还发现，掩蔽在刺激之前比在刺激之后更有效，并且这种掩蔽可被表征为A型效应。讨论了这些数据对扫视抑制机制的影响。
