Mueller T J, Blake R
Department of Biology, Harvey Mudd College, Claremont, CA 91711.
Biol Cybern. 1989;61(3):223-32. doi: 10.1007/BF00198769.
Human observers viewed dichoptic orthogonal sine-wave gratings and indicated when exclusive visibility occurred in either eye. Contrast was held constant in one eye and was increased or decreased in the other eye for a number of alternation cycles (continuous presentation) or for only the duration of a single period of exclusive visibility (synchronous presentation). The synchronous presentation condition allowed us to identify the differing effects of contrast during the suppressed and during the dominant periods. Mixed phases were recorded as distinct from suppressed and dominant phases, and new classifications of compound-dominant and compound-suppressed phases are defined. The results indicate that binocular rivalry responds to stimulus contrast in two ways. 1) The duty-cycle of dominance and suppression is determined by the relative image contrast between the two eyes, with dominance of the higher contrast image being favored, and 2) the overall rate of alternation is driven by monocular image contrast during the suppressed phase (increased monocular contrast increases the alternation rate) and to a lesser extent by monocular contrast during the dominant phase (increased monocular contrast decreases the rate). A model is developed to reflect these ideas. These results support a reciprocal inhibition oscillator as the underlying mechanism of binocular rivalry.
人类观察者观看双眼视差正交正弦波光栅，并指出哪只眼睛出现了独占性可见性。在一只眼睛中对比度保持恒定，而在另一只眼睛中对比度在多个交替周期（连续呈现）或仅在独占性可见性的单个周期持续时间内（同步呈现）增加或降低。同步呈现条件使我们能够识别在抑制期和优势期对比度的不同影响。混合相位被记录为与抑制期和优势期不同，并且定义了复合优势期和复合抑制期的新分类。结果表明，双眼竞争以两种方式对刺激对比度做出反应。1）优势和抑制的占空比由两只眼睛之间的相对图像对比度决定，对比度较高的图像更易占优势，并且2）交替的总体速率在抑制期由单眼图像对比度驱动（单眼对比度增加会提高交替速率），在优势期则在较小程度上由单眼对比度驱动（单眼对比度增加会降低速率）。开发了一个模型来反映这些观点。这些结果支持相互抑制振荡器作为双眼竞争的潜在机制。
