Passive Exposure Sparsifies Neural Activity in the Primary Visual Cortex
Passive Exposure Sparsifies Neural Activity in the Primary Visual Cortex
复制标题
被动暴露会使初级视觉皮层的神经活动稀疏
DOI:
10.1101/2021.11.18.469160
复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Jan Homann, Hyewon Kim
中科院分区:
文献类型:
--
作者:
Jan Homann, Hyewon Kim
A notable feature of neural activity is sparseness – namely, that only a small fraction of neurons in a local circuit have high activity at any moment. Not only is sparse neural activity observed experimentally in most areas of the brain, but sparseness has been proposed as an optimization or design principle for neural circuits. Sparseness can increase the energy efficiency of the neural code as well as allow for beneficial computations to be carried out. But how does the brain achieve sparse-ness? Here, we found that when neurons in the primary visual cortex were passively exposed to a set of images over several days, neural responses became more sparse. Sparsification was driven by a decrease in the response of neurons with low or moderate activity, while highly active neurons retained similar responses. We also observed a net decorrelation of neural activity. These changes sculpt neural activity for greater coding efficiency.
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