Morgan M J, Tyler C W
Department of Visual Science, Institute of Ophthalmology, London, U.K.
Proc Biol Sci. 1995 Dec 22;262(1365):371-6. doi: 10.1098/rspb.1995.0219.
When dynamic visual noise such as the 'snow' on a detuned television receiver is inspected with a delay between the signals in the two eyes, the noise appears to rotate in depth around a vertical axis. We propose that this dynamic noise stereophenomenon arises because channels tuned jointly to depth and motion respond selectively to horizontal motion components in the noise. We used spatially filtered stimuli to reduce the strength of vertically oriented Fourier components in the noise, and found that this reduced the strength of the stereophenomenon. Reducing the strength of horizontally oriented components had a lesser effect. Our evidence is consistent with the conclusion that stereo-motion is predominantly detected by oriented receptive fields with an aspect ratio similar to those of cortical simple cells.
当用两眼信号之间存在延迟的方式观察诸如失谐电视接收机上的“雪花”之类的动态视觉噪声时，噪声似乎会围绕垂直轴在深度上旋转。我们提出这种动态噪声立体现象的出现是因为联合调谐到深度和运动的通道会选择性地响应噪声中的水平运动分量。我们使用空间滤波刺激来降低噪声中垂直方向傅里叶分量的强度，发现这降低了立体现象的强度。降低水平方向分量的强度则产生较小的影响。我们的证据与以下结论一致，即立体运动主要由长宽比与皮层简单细胞相似的定向感受野检测到。
