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Receptive field modification induced by natural scenes stimulation in rat visual cortex

Receptive field modification induced by natural scenes stimu...

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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Ying-Jie ZHU,Hai-Shan YAO~* Institute of Neuroscience,State Key Laboratory of Neuroscience,Shanghai Institutes for Biological Sciences,Chinese Academy of Sciences,Shanghai,200031,China

＜正＞Objective Visual experience can cause functional modification in the adult visual cortex,but the mechanisms of cortical modification under natural stimulation remain to be *** present study is to explore whether and how the natural scenes stimulation modify the receptive field（RF） of neurons in rat *** In this study,we used in vivo patch recordings in rat V1 to examine the receptive field（RF） modification induced by stimulation of natural scenes movies. RF map was measured with sparse noise before and after repetitive stimulation of natural movie（25-sec long,repeated 25 times）.Results（1） Natural movie stimulation caused heterogeneous modifications in the local synaptic responses,with some responses enhanced and some depressed.（2） The changes in local synaptic responses caused change in the global structure of synaptic RF *** examine the relationship between RF modification and the movie images,we first grouped the images into three subsets:images that caused depolarization（S+）,images that caused hyperpolarization（S-）,and images that did not change the mean membrane *** then quantified the similarity between RF map and each movie image by calculating their correlation coefficient（CC）.After the movie stimulation,the CCs between S+ images and RF were significantly shifted toward positive values,whereas the CCs between S- images and RF did not change significantly,indicating the RF is modified to become more similar to the subset of movie images that can depolarize the cell.（3） In the absence of further movie stimulation,the modification can last for 5 to 10 min.（4） Repeated exposure to white noise did not cause significant change in the CCs,indicating the RF modification is stimulus specific.（5） The magnitude of the modification was dependent on the spiking activity of the neuron evoked by the movie.（6） Associated with the change in RF spatial structure,spike rate of the neuron during movie stimulation selectively increased for those im

关键词： receptive field modification V1 natural scenes hebbian synaptic plasticity

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