Integration of information from both eyes by single neurons of nucleus rotundus, ectostriatum and lateral neostriatum in the zebra finch (Taeniopygia guttata castanotis Gould)
Integration of information from both eyes by single neurons of nucleus rotundus, ectostriatum and lateral neostriatum in the zebra finch (Taeniopygia guttata castanotis Gould)
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DOI：
10.1016/s0006-8993(01)03192-4
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发表时间：
2001-12-27
期刊：
影响因子：
2.9
通讯作者：
Bischof, HJ
中科院分区：
文献类型：
--
作者：
Schmidt, A;Bischof, HJ
尽管鸟类的视神经完全交叉，但来自同侧眼睛的视觉信息也通过重新交叉纤维到达外纹状体，即顶盖通路的端脑静止点。这些交叉投影将对侧视盖与同侧圆核连接起来。进而投射到外纹状体。外纹状体本身投射到上面的外侧新纹状体。在性印记中发挥重要作用的区域。这项研究表明，对侧和同侧信息汇聚在圆核内的单个神经元上。外纹状体区和外侧新纹状体。在这三个大脑区域中，几乎所有孤立的神经元都表现出对对侧和双侧视觉刺激的反应。对同侧刺激作出反应的神经元数量从圆核到外侧新纹状体增加。我们没有发现任何神经元完全由同侧刺激驱动。同侧反应的强度在圆核和外纹状体中相当弱，但在外侧新纹状体中表现出急剧增加。对于圆核和外纹状体的大多数神经元来说，额外的同侧刺激不会显着影响对对侧刺激的反应。相反，在新纹状体中可以发现强烈的兴奋作用。结果与之前的诱发电位研究一致，并为斑胸草雀顶盖视觉通路中同侧和对侧刺激的整合提供了新的见解。 (C) 2001 Elsevier Science B.V. 保留所有权利。
Although the optic nerve in birds crosses completely, visual information from the ipsilateral eye also reaches the ectostriatum, the telencephalic statibon of the tectofugal pathway, by recrossing fibers. These recrossing projections connect the contralateral tecturn opticum with the ipsilateral nucleus rotundus. which in turn projects to the ectostriatum. The ectostriatum itself projects to the overlying lateral neostriatum. an area which serves an important role in sexual imprinting. This study shows that contralateral and ipsilateral information converges on single neurons within the nucleus rotundus. the ectostriatal region and the lateral neostriatum. In the three brain areas almost all isolated neurons exhibited responses to contralateral as well as bilateral visual stimuli. The number of neurons responding to ipsilateral stimuli increases from nucleus rotundus to the lateral neostriatum. We did not find any neurons driven exclusively by ipsilateral stimuli. The strength of ipsilateral responses is rather weak within the nucleus rotundus and ectostriatum, but shows a sharp increase in the lateral neostriatum. For most neurons of nucleus rotundus and ectostriatum, an additional ipsilateral stimulus did not significantly affect the response to a contralateral one. In contrast, a strong excitatory effect can be found in the neostriatum. The results are in agreement with previous evoked-potential studies and give new insights on the integration of ipsilateral and contralateral stimuli in zebra finch tectofugal visual pathway. (C) 2001 Elsevier Science B.V. All rights reserved.