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Unusual Physiological Properties of Smooth Monostratified Ganglion Cell Types in Primate Retina.
Neuron ( IF 14.7 ) Pub Date : 2019-06-18 , DOI: 10.1016/j.neuron.2019.05.036
Colleen E Rhoades 1 , Nishal P Shah 2 , Michael B Manookin 3 , Nora Brackbill 4 , Alexandra Kling 5 , Georges Goetz 5 , Alexander Sher 6 , Alan M Litke 6 , E J Chichilnisky 7
Affiliation  

The functions of the diverse retinal ganglion cell types in primates and the parallel visual pathways they initiate remain poorly understood. Here, unusual physiological and computational properties of the ON and OFF smooth monostratified ganglion cells are explored. Large-scale multi-electrode recordings from 48 macaque retinas revealed that these cells exhibit irregular receptive field structure composed of spatially segregated hotspots, quite different from the classic center-surround model of retinal receptive fields. Surprisingly, visual stimulation of different hotspots in the same cell produced spikes with subtly different spatiotemporal voltage signatures, consistent with a dendritic contribution to hotspot structure. Targeted visual stimulation and computational inference demonstrated strong nonlinear subunit properties associated with each hotspot, supporting a model in which the hotspots apply nonlinearities at a larger spatial scale than bipolar cells. These findings reveal a previously unreported nonlinear mechanism in the output of the primate retina that contributes to signaling spatial information.

中文翻译:

灵长类动物视网膜平滑单层神经节细胞类型的异常生理特性。

灵长类动物不同类型视网膜神经节细胞的功能以及它们启动的平行视觉通路仍然知之甚少。在这里,探索了 ON 和 OFF 平滑单层神经节细胞的不寻常的生理和计算特性。对 48 只猕猴视网膜的大规模多电极记录表明,这些细胞表现出由空间隔离的热点组成的不规则感受野结构,与经典的视网膜感受野中心-环绕模型有很大不同。令人惊讶的是,同一细胞中不同热点的视觉刺激产生了时空电压特征略有不同的尖峰,这与树突对热点结构的贡献一致。有针对性的视觉刺激和计算推理证明了与每个热点相关的强大的非线性亚基特性,支持了热点在比双极细胞更大的空间尺度上应用非线性的模型。这些发现揭示了灵长类动物视网膜输出中以前未报道的非线性机制,该机制有助于发出空间信息。
更新日期:2019-06-18
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