TYPES OF VISUAL RESPONSE FROM SINGLE UNITS IN OPTIC TECTUM + OPTIC NERVE OF GOLDFISH
TYPES OF VISUAL RESPONSE FROM SINGLE UNITS IN OPTIC TECTUM + OPTIC NERVE OF GOLDFISH
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DOI：
10.1113/expphysiol.1964.sp001720
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发表时间：
1964-01-01
影响因子：
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通讯作者：
GAZE, RM
中科院分区：
文献类型：
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作者：
JACOBSON, M;GAZE, RM
使用填充金属的微吸管电极，我们记录了金鱼顶盖和视交叉的单个单位的反应。反应是由视觉刺激引起的，有光点和大小不一的黑盘。在许多情况下，在从一个单元记录之后，通过制作直径为10-50[mU]的电解损伤来标记电极尖端的位置。这些病变都被发现位于顶盖的纤维层之一，或者是在含有视神经传入纤维的三个最浅的纤维层中的一个，或者是在最深的纤维层中。两个最浅的纤维层包含“开”、“关”和简短的“开-关”单元，它们似乎没有被分成只包含一种类型的单元的层。其中一些单元在方向上很敏感。缓慢适应的“开”和“关”单位占主导地位的第三纤维层。最深的纤维层位于顶盖细胞主层之下，包含了顶盖表面附近纤维层中的所有类型的单位。在视顶盖发现的所有类型的反应也从视交叉中记录下来。图由视交叉和视顶盖不同深度记录的单位的感受野组成。视交叉和顶盖各层的感受区通常被组织成相邻的，而不是同心的“开”和“关”区。绘制了视野到视顶盖的地形图。在电极穿透到与顶盖表面垂直的顶盖时遇到的单位被发现具有重叠的感受野。未见同侧投射。
Using metal-filled micropipette electrodes we have recorded responses from single units in the optic tectum and optic chiasma of the goldfish. Responses were evoked by visual stimulation with spots of light and with black discs of various sizes. In many cases, after recording from a unit, the position of the electrode tip was marked by making an electrolytic lesion 10-50 [mu] in diameter. These lesions were all found to be in one of the fibre layers of the tectum, either in one of the three most superficial fibre layers which contain the optic afferent fibres, or in the deepest layer of fibres. The two most superficial fibre layers contained "on", "off" and brief "on-off" units which did not appear to be segregated into strata containing only one type of unit. Some of these units were directionally sensitive. Slowly-adapting "on" and "off" units predominated in the third fibre layer. The deepest fibre layer, below the main layer of tectal cells, contained all the types of units found in the fibre layers near the surface of the tectum. All the types of response found in the optic tectum were also recorded from the optic chiasma. Maps were made of the receptive fields of units recorded in the optic chiasma and at various depths in the optic tectum. Receptive fields organized into adjacent, rather than concentric "on" and "off" zones, were frequently found in the optic chiasma and at all levels in the tectum. The topographical projection of the visual field onto the optic tectum was mapped. Units encountered during an electrode penetration into the tectum normal to its surface were found to have overlapping receptive fields. No ipsilateral projection was found.