Uchikawa K, Sato M
Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, Yokohama, Japan.
J Opt Soc Am A Opt Image Sci Vis. 1995 Apr;12(4):661-6. doi: 10.1364/josaa.12.000661.
We measured spectral-sensitivity functions during saccadic eye movement by the increment-threshold method to test whether saccades selectively suppressed achromatic or chromatic responses. A circular monochromatic test stimulus of 12-deg diameter was presented for 10 ms on a 62 deg x 43 deg white background, and observations were made under three conditions: during fixation, during 6-deg saccades, and immediately after saccades. In two additional conditions the test stimulus was made to move during fixation and during 6-deg saccades at the same speed and in the same direction as the saccades. The during-fixation spectral-sensitivity function was found to resemble the relative luminous efficiency V (lambda) function in shape except for the case of short wavelengths, whereas the during-saccade spectral-sensitivity function showed lower sensitivity for all wavelengths and had three prominent peaks at approximately 440, 530, and 600 nm. These characteristics did not depend on whether the stimulus was stationary or moving. These results indicated that saccadic suppression was greater for achromatic than for chromatic response. A possible suppression mechanism was discussed involving the magno and parvo pathways.
我们采用增量阈值法测量了扫视眼动过程中的光谱敏感性函数，以测试扫视是否选择性地抑制了非彩色或彩色反应。在62度×43度的白色背景上，呈现一个直径为12度的圆形单色测试刺激，持续10毫秒，并在三种条件下进行观察：注视期间、6度扫视期间以及扫视之后立即进行观察。在另外两种条件下，测试刺激在注视期间和6度扫视期间以与扫视相同的速度和方向移动。结果发现，除了短波长情况外，注视期间的光谱敏感性函数在形状上类似于相对发光效率V（λ）函数，而扫视期间的光谱敏感性函数在所有波长下都表现出较低的敏感性，并且在大约440、530和600纳米处有三个明显的峰值。这些特征并不取决于刺激是静止的还是移动的。这些结果表明，扫视抑制对非彩色反应的作用比对彩色反应的作用更大。讨论了一种可能的抑制机制，涉及大细胞和小细胞通路。
