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首页> 外文期刊>Neuron >Inhibition, spike threshold, and stimulus selectivity in primary visual cortex.
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Inhibition, spike threshold, and stimulus selectivity in primary visual cortex.

机译：初级视觉皮层的抑制，峰值阈值和刺激选择性。

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Ever since Hubel and Wiesel described orientation selectivity in the visual cortex, the question of how precise selectivity emerges has been marked by considerable debate. There are essentially two views of how selectivity arises. Feed-forward models rely entirely on the organization of thalamocortical inputs. Feedback models rely on lateral inhibition to refine selectivity relative to a weak bias provided by thalamocortical inputs. The debate is driven by two divergent lines of evidence. On the one hand, many response properties appear to require lateral inhibition, including precise orientation and direction selectivity and crossorientation suppression. On the other hand, intracellular recordings have failed to find consistent evidence for lateral inhibition. Here we demonstrate a resolution to this paradox. Feed-forward models incorporating the intrinsic nonlinear properties of cortical neurons and feed-forward circuits (i.e., spike threshold, contrast saturation, and spike-rate rectification) can account for properties that have previously appeared to require lateral inhibition.
机译：自从Hubel和Wiesel描述了视觉皮层中的定向选择性以来，关于精确选择性如何出现的问题就引起了广泛的争论。关于选择性如何产生，基本上有两种观点。前馈模型完全依赖于丘脑皮质输入的组织。反馈模型依靠横向抑制来相对于丘脑皮层输入提供的弱偏置来改善选择性。辩论是由两种不同的证据驱动的。一方面，许多响应特性似乎需要横向抑制，包括精确的方向和方向选择性以及交叉方向抑制。另一方面，细胞内记录未能找到一致的横向抑制证据。在这里，我们证明了这一悖论的解决方案。结合了皮层神经元和前馈电路的固有非线性特性（即尖峰阈值，对比饱和度和尖峰速率整流）的前馈模型可以解释以前似乎需要横向抑制的特性。

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