Zumbroich T J, von Grünau M, Poulin C, Blakemore C
Exp Brain Res. 1986;64(1):77-93. doi: 10.1007/BF00238203.
We have studied the orderliness of representation of visual space in the medial and lateral banks of the middle suprasylvian sulcus. Penetrations were made either parallel to the sulcus, in one bank or the other, or vertical, thus crossing the sulcus between the postero-medial (PMLS) and posterolateral (PLLS) divisions of this area. In some cases we found clear evidence for topographical order in the representation of the visual field with a tendency (greater in PMLS than in PLLS) for the receptive fields of cells recorded deeper in the walls of the sulcus to lie closer to the area centralis, but along many penetrations the receptive fields were so large and so scattered that no retinotopic arrangement could be discerned. In PMLS the receptive fields of the majority of units we studied were centered below and close to the horizontal meridian, whereas in PLLS they were distributed over both the upper and lower visual fields with an over-representation of the upper field. Receptive fields were significantly larger in PLLS (mean field area = 442.2 deg2) than in PMLS (mean area = 154.4 deg2); there was also less clear correlation between receptive field size and eccentricity in PLLS (correlation coefficient = +0.25) than in PMLS (corr. coeff. = +0.72). Analysis of the distance between the receptive field centres of consecutively recorded units demonstrated that the mean scatter in both PMLS and PLLS amounts to about half the average receptive field diameter. In summary the topographical representation of visual space is less orderly in PLLS, and may involve a wider area of the visual field. These findings may relate to the segregated visual cortical and extrageniculate thalamic connections that the medial and lateral banks of the LS receive.
我们研究了中颞上沟内侧和外侧脑回中视觉空间表征的有序性。电极穿透要么平行于脑沟，在一侧脑回进行，要么垂直穿透，从而穿过该区域后内侧（PMLS）和后外侧（PLLS）分区之间的脑沟。在某些情况下，我们发现了视野表征存在拓扑顺序的明确证据，在脑沟壁较深处记录的细胞感受野有靠近中央区的趋势（PMLS中比PLLS中更明显），但沿许多穿透路径，感受野非常大且分散，以至于无法辨别视网膜拓扑排列。在PMLS中，我们研究的大多数神经元的感受野集中在水平子午线下方且靠近水平子午线的位置，而在PLLS中，它们分布于上、下视野，其中上视野有过度表征。PLLS中的感受野（平均视野面积 = 442.2度²）明显大于PMLS中的感受野（平均面积 = 154.4度²）；PLLS中感受野大小与偏心度之间的相关性（相关系数 = +0.25）也不如PMLS中明显（相关系数 = +0.72）。对连续记录的神经元感受野中心之间距离的分析表明，PMLS和PLLS中的平均离散度约为平均感受野直径的一半。总之，视觉空间的拓扑表征在PLLS中不太有序，可能涉及更广泛的视野区域。这些发现可能与LS内侧和外侧脑回所接受的分离的视觉皮层和丘脑外膝体连接有关。
