A Neural Signature of Divisive Normalization at the Level of Multisensory Integration in Primate Cortex.

A Neural Signature of Divisive Normalization at the Level of Multisensory Integration in Primate Cortex.
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在灵长类皮层中多感官整合水平上的分裂归一化的神经特征。

DOI:
10.1016/j.neuron.2017.06.043
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发表时间:
2017-07-19
期刊:
影响因子:
16.2
通讯作者:
DeAngelis GC
DeAngelis GC
中科院分区:
医学1区
文献类型:
--
作者:
Ohshiro T;Angelaki DE;DeAngelis GC

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单神经元多感觉整合的研究传统上强调的是描述来自两个感觉模式的输入之间的非线性相互作用的经验原则。我们之前提出,这些经验原理中的许多可以通过大脑中发生多感觉整合的区域的分裂归一化机制来解释。这个归一化模型做出了一个关键的诊断预测:来自一种通道的非首选感觉输入本身激活了神经元,应该抑制对来自另一种通道的首选输入的反应。我们通过记录猕猴区MSTd中整合了视觉和前庭自我运动线索的神经元来测试这一预测。我们发现,许多MSTd神经元表现出跨模式抑制的诊断形式,而MT区的单感觉神经元则没有。归一化模型也比基于减法抑制的模型更适合群体反应。这些发现为多感觉整合中的分裂归一化机制提供了强有力的支持。
Studies of multisensory integration by single neurons have traditionally emphasized empirical principles that describe nonlinear interactions between inputs from two sensory modalities. We previously proposed that many of these empirical principles could be explained by a divisive normalization mechanism operating in brain regions where multisensory integration occurs. This normalization model makes a critical diagnostic prediction: a non-preferred sensory input from one modality, which activates the neuron on its own, should suppress the response to a preferred input from another modality. We tested this prediction by recording from neurons in macaque area MSTd that integrate visual and vestibular cues regarding self-motion. We show that many MSTd neurons exhibit the diagnostic form of cross-modal suppression, whereas unisensory neurons in area MT do not. The normalization model also fits population responses better than a model based on subtractive inhibition. These findings provide strong support for a divisive normalization mechanism in multisensory integration.
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发表时间: 2002-11-01
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