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Local Integration Accounts for Weak Selectivity of Mouse Neocortical Parvalbumin Interneurons

机译:本地整合帐户的鼠标新皮质小白蛋白interneurons的选择性弱。

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Dissecting the functional roles of excitatory and inhibitory neurons in cortical circuits is a fundamental goal in neuroscience. Of particular interest are their roles in emergent cortical computations such as binocular integration in primary visual cortex (V1). We measured the binocular response selectivity of genetically defined subpopulations of excitatory and inhibitory neurons. Parvalbumin (PV+) interneurons received strong inputs from both eyes but lacked selectivity for binocular disparity. Because broad selectivity could result from heterogeneous synaptic input from neighboring neurons, we examined how individual PV+ interneuron selectivity compared to that of the local neuronal network, which is primarily composed of excitatory neurons. PV+ neurons showed functional similarity to neighboring neuronal populations over spatial distances resembling measurements of synaptic connectivity. On the other hand, excitatory neurons expressing CaMKII alpha displayed no such functional similarity with the neighboring population. Our findings suggest that broad selectivity of PV+ interneurons results from nonspecific integration within local networks.
机译:解剖兴奋性和抑制性神经元在皮层回路中的功能作用是神经科学的基本目标。特别令人关注的是它们在紧急皮质计算中的作用,例如初级视觉皮层(V1)中的双眼整合。我们测量了兴奋性和抑制性神经元的遗传定义亚群的双眼反应选择性。小白蛋白(PV +)中间神经元从两只眼睛都得到了强烈的输入,但缺乏对双眼视差的选择性。由于广泛的选择性可能来自邻近神经元的异质突触输入,因此我们检查了与主要由兴奋性神经元组成的局部神经元网络相比,单个PV +中间神经元的选择性如何。 PV +神经元在空间距离上显示出与邻近神经元群体的功能相似性,类似于对突触连接性的测量。另一方面,表达CaMKIIα的兴奋性神经元与邻近人群没有这种功能相似性。我们的发现表明,PV +中间神经元的广泛选择性是由本地网络内的非特异性整合导致的。

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