Subthreshold mechanisms underlying state-dependent modulation of visual responses.

Subthreshold mechanisms underlying state-dependent modulation of visual responses.
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DOI:
10.1016/j.neuron.2013.08.007
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发表时间:
2013-10-16
期刊:
影响因子:
16.2
通讯作者:
Hestrin S
Hestrin S
中科院分区:
医学1区
文献类型:
--
作者:
Bennett C;Arroyo S;Hestrin S

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感官信息的处理在不同的行为状态下有很大的不同。然而,很少有人知道行为状态如何调节皮层神经元的细胞内活动,影响感觉反应的变化。在这里,我们对清醒小鼠在运动和安静清醒状态下的上层初级视觉皮层神经元进行了全细胞记录。我们发现,在运动过程中,感觉反应的信噪比通过两种机制得到改善:(1)膜电位变异性降低,导致背景放电率降低;(2)通过增加总电导和刺激诱发的逆转电位去极化介导的视觉诱发阈下反应的幅度和可靠性增强。与运动过程中视觉反应的增强信噪比一致,我们证明了在这种行为状态下视觉检测任务的性能得到了改善。
The processing of sensory information varies widely across behavioral states. However, little is known about how behavioral states modulate the intracellular activity of cortical neurons to effect changes in sensory responses. Here, we performed whole-cell recordings from neurons in upper-layer primary visual cortex of awake mice during locomotion and quiet wakefulness. We found that the signal-to-noise ratio for sensory responses was improved during locomotion by two mechanisms: (1) a decrease in membrane potential variability leading to a reduction in background firing rates, and (2) an enhancement in the amplitude and reliability of visually-evoked subthreshold responses mediated by an increase in total conductance and a depolarization of the stimulus-evoked reversal potential. Consistent with the enhanced signal-to-noise ratio for visual responses during locomotion, we demonstrate that performance is improved in a visual detection task during this behavioral state.
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