Tripathy S P, Levi D M
College of Optometry, University of Houston, TX 77204-6052.
Vision Res. 1994 May;34(9):1127-38. doi: 10.1016/0042-6989(94)90295-x.
The region of the visual field of one eye that corresponds to the blind spot of the contralateral eye is believed to be monocular. We measured dichoptic contour interaction in this region of the visual field in humans by having observers report the orientation of a test letter "T" presented to this region, in the presence of flanking T's presented around the blind spot of the fellow eye. A large drop in performance was seen because of the flanks, showing clearly the existence of dichoptic contour interaction in this "monocular" region of the visual field. This suggests that the cortical representation of the region of the visual field that corresponds to the contralateral eye's blind spot is not strictly monocular. The absence of direct retinal afferents from one eye to this region of cortex suggests the involvement of horizontal cortical connections in the contour interaction phenomenon. Our estimates of the extent of contour interaction in mm of striate cortex are comparable to the reported lengths of the long-range horizontal connections in the striate cortex of monkeys. Our results are consistent with the proposition that long-range horizontal connections of the striate cortex may mediate the contour interaction phenomenon.
一只眼睛视野中与对侧眼盲点相对应的区域被认为是单眼的。我们通过让观察者报告呈现给该区域的测试字母“T”的方向，来测量人类视野中该区域的双眼轮廓相互作用，同时在另一只眼的盲点周围呈现侧翼“T”。由于侧翼的存在，表现大幅下降，清楚地表明在视野的这个“单眼”区域存在双眼轮廓相互作用。这表明与对侧眼盲点相对应的视野区域的皮质表征并非严格单眼的。一只眼睛没有直接的视网膜传入纤维到达皮质的这个区域，这表明水平皮质连接参与了轮廓相互作用现象。我们对视皮层中轮廓相互作用范围（以毫米为单位）的估计与报告的猴子视皮层中长程水平连接的长度相当。我们的结果与视皮层的长程水平连接可能介导轮廓相互作用现象这一观点一致。
