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- W2356244968 abstract "Pattern adaptation is believed to be a unique property of cortical cells.However,recent work in our laboratory has demonstrated grating adaptation of relay cells in the dorsal geniculate nucleus(dLGN) following prolonged exposure to a drifting grating in the normal and cortex ablated cats [1] .The purpose of this study is to test if grating adaptation revealed in the dLGN originates from the retina.We studied the responses of 79 X and Y type ganglion cells in the cat retina to prolonged grating stimuli.In contrast to the dLGN relay cells,neither pattern adaptation nor facilitation was found in the majority of studied cells(71%)in the retina.Only 6% of the cells studied were adapted to the adapting grating,while 23% of the cells studied showed significant facilitation rather than adaptation.There was no significant difference either between X and Y cells or between On center and Off center cells in susceptibility to adapting grating stimuli.The facilitation observed in the retinal ganglion cells completed within 30 s with a mean response increase of 17%,whose time course was well fitted to an exponential function with a mean time constant of 17.7s.The results suggest that the pattern adaptation may essentially originate from the dLGN,while pattern facilitation from the retina.Therefore,the intrageniculate mechanisms may cause the pattern adaptation in the dLGN. [" @default.
- W2356244968 created "2016-06-24" @default.
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- W2356244968 date "2000-01-01" @default.
- W2356244968 modified "2023-09-23" @default.
- W2356244968 title "The cat's retinal ganglion cells show weak pattern adaptation but significant pattern facilitation to prolonged grating stimuli" @default.
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