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首页> 外文期刊>Neuron >Cellular mechanisms underlying stimulus-dependent gain modulation in primary visual cortex neurons in vivo.
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Cellular mechanisms underlying stimulus-dependent gain modulation in primary visual cortex neurons in vivo.

机译:体内初级视觉皮层神经元中刺激依赖的增益调节基础的细胞机制。

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摘要

Gain modulation is a widespread neuronal phenomenon that modifies response amplitude without changing selectivity. Computational and in vitro studies have proposed cellular mechanisms of gain modulation based on the postsynaptic effects of background synaptic activation, but these mechanisms have not been studied in vivo. Here, we used intracellular recordings from cat primary visual cortex to measure neuronal gain while changing background synaptic activity with visual stimulation. We found that increases in the membrane fluctuations associated with increases in synaptic input do not obligatorily result in gain modulation in vivo. However, visual stimuli that evoked sustained changes in resting membrane potential, input resistance, and membrane fluctuations robustly modulated neuronal gain. The magnitude of gain modulation depended critically on the spatiotemporal properties of the visual stimulus. Gain modulation in vivo may thus be determined on a moment-to-moment basis by sensory context and the consequent dynamics of synaptic activation.
机译:增益调制是一种广泛的神经元现象,可以改变响应幅度而不改变选择性。计算和体外研究已经提出了基于背景突触激活的突触后效应的增益调节的细胞机制,但是尚未在体内研究这些机制。在这里,我们使用了猫原发性视觉皮层的细胞内记录来测量神经元增益,同时通过视觉刺激改变背景突触活动。我们发现与突触输入的增加相关的膜波动的增加不一定会导致体内的增益调节。但是,引起静止膜电位,输入阻力和膜波动的持续变化的视觉刺激强烈调节了神经元的增益。增益调制的大小主要取决于视觉刺激的时空特性。体内的增益调节因此可以通过感官环境和突触激活的随之而来的瞬间确定。

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