A Corticothalamic Circuit for Dynamic Switching between Feature Detection and Discrimination.

A Corticothalamic Circuit for Dynamic Switching between Feature Detection and Discrimination.
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用于在特征检测和歧视之间动态切换的皮质丘脑电路。

DOI:
10.1016/j.neuron.2017.05.019
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发表时间:
2017-07-05
期刊:
影响因子:
16.2
通讯作者:
Polley DB
Polley DB
中科院分区:
医学1区
文献类型:
--
作者:
Guo W;Clause AR;Barth-Maron A;Polley DB

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Sensory processing must be sensitive enough to encode faint signals near the noise floor, but selective enough to differentiate between similar stimuli. Here we describe a layer 6 corticothalamic (L6 CT) circuit in the mouse auditory forebrain that alternately biases sound processing towards hypersensitivity and improved behavioral sound detection or dampened excitability and enhanced sound discrimination. Optogenetic activation of L6 CT neurons could increase or decrease the gain and tuning precision in the thalamus and all layers of the cortical column, depending on the timing between L6 CT activation and sensory stimulation. The direction of neural and perceptual modulation – enhanced detection at the expense of discrimination or vice versa – arose from the interaction of L6 CT neurons and sub-networks of fast-spiking inhibitory neurons that reset the phase of low-frequency cortical oscillations. These findings suggest that L6 CT neurons contribute towards resolving the competing demands of detection and discrimination.
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