Evidence for a neural mechanism that encodes angles
Evidence for a neural mechanism that encodes angles
复制标题
编码角度的神经机制的证据
DOI：
10.1016/0042-6989(95)00113-e
复制
发表时间：
1996
期刊：
影响因子：
1.8
通讯作者：
S. Hamstra
中科院分区：
文献类型：
--
作者：
D. Regan;R. Gray;S. Hamstra
我们测量了辨别阈值(Δθ)和角度θ，其中θ是包含在额面内的两条直线组成的VEE的角度，或者是包含在额面内的两条直线的交角。两条线的图案在两次试验之间以随机的角度旋转，目的是消除其中一条线的绝对方向作为任务的可靠线索。我们报告的证据表明，这一目标已经实现。我们的主要结论是，辨别角度θ变化的能力不能完全用辨别组成VEE的个别直线的方向变化的能力来解释。我们认为，人类的视觉通路包含一种神经机制，它编码两条同时呈现的直线方向的差异。角度辨别阈值(Δθ)这是一条孤立线的大约两倍的方向辨别阈值。当受试者不能使用一条或另一条线的方向作为任务的线索时，(Δθ)Thvsθ的情节大约在θ=20到160deg之间平坦。
We measured the discrimination threshold (Δθ)Thfor angle θ, where θ was either the angle of a Vee composed of two straight lines contained within the frontoparallel plane or the angle of intersection of two straight lines contained within the frontoparallel plane. The two-line pattern was rotated bodily through a random angle between trials with the aim of eliminating the absolute orientation of one or the other line as a reliable cue to the task. We report evidence that this aim was achieved. Our main conclusion is that the ability to discriminate a change in angle θ cannot entirely be explained in terms of the ability to discriminate changes in the orientations of the individual lines that comprise the Vee. We propose that the human visual pathway contains a neural mechanism that encodes the difference in the orientations of two simultaneously-presented straight lines. Discrimination threshold for angle (Δθ)This roughly twice orientation discrimination threshold for an isolated line. When subjects cannot use the orientation of one or another line as a cue to the task, the plot of (Δθ)Thvs θ is approximately flat between θ = 20 and 160 deg.