【摘要】 用细胞外记录技术研究了金黄地鼠一侧视皮层神经元对电刺激另一侧相应部位的反应及其对视觉刺激反应的特点。(1)在17—18a 交界区大多数(78%)细胞能被电刺激对侧相应点所驱动。在17区内部,被驱动细胞数随离开17—18a 交界距离增加而减少。(2)按对电刺激的反应形式,记录的细胞可分为四类:a.逆行驱动细胞,占17—18a 交界区记录细胞数的20%;b.顺行驱动细胞,占52%中;c.自发发放因电刺激而减少或完全停止的细胞,占6%,d.其余细胞(22%)对电刺激没有可察觉的反应。(3)在17—18a 交界,除了Ⅰ层以外的各层都可记录到顺行驱动细胞,而逆行驱动细胞则主要集中在Ⅲ及Ⅴ层。(4)17—18a 交界细胞感受野(RF)多位于垂直中线附近的对侧视野内,有些 RF 跨越中线,其边界延伸到同侧约10°处。(5)逆行驱动细胞包括刁和 Blakemore 以前在视皮层中记录到的所有细胞类型和各种程度的眼优势,但单眼细胞的比例增加,非对称式 RF 和中心对称式的给-撤型 RF 的比例有所减少。更多还原

【Abstract】 Responses of visual cortical neurones in the visual cortex of the golden hamsterto electrical shocks delivered to the corresponding sites of the opposite hemisphereand to visual stimuli were investigated by means of extracellular recording technique.1.Most of the cells（78%）studied at the 17-18a border region could be drivenby electrical shocks.Their number decreased as the electrode was moved furtherto area 17 away from the 17—18a border.2.In the 17—18a border region,the recorded cells could be classified into 4groups according to their responses to electrical shocks:（a）20% of the recordedcells could be driven antidromically;（b）52%,orthodromically;（c）6% mani-fested a depression or complete cessation of the spontaneous discharge;and（d）the rest 22% had no detectable responses.3.In the 17—18a border region,the cells which could be driven orthodromi-cally were recorded at all depths except in layer Ⅰ;while the cells which could beactivated antidromically were located mainly in layer Ⅲ and Ⅴ.4.Receptive fields of most neurones in the 17—18a border region were loca-ted in the contralateral hemifield near the vertical midline.Some of the recep-tive fields were found in the ipsilateral hemifield with their borders reaching about10°ipsilaterally.5.Cells that could be driven antidromically in the 17—18a border regionconsists of cells with almost all types of receptive field organization and variousdegress of ocular dominance as described in a previous study of the visual cortexof the golden hamster(Tiao & Blakemore^[16]).However,in the present study,the proportion of cells with asymmetrical and on-off concentric receptive fields issmaller while the proportion of cells that could be monocularly driven is higher.更多还原