Spatiotemporal organization of simple-cell receptive fields in area 18 of cat's cortex |
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Authors: | LEI Jingjiang LI Chaoyi |
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Institution: | (1) Shanghai Institute of Physiology, Chinese Academy of Sciences, 200031 Shanghai, China;(2) Laboratory of Visual Information Processing, Institute of Biophysics, Chinese Academy of Sciences, 100101 Beijing, China |
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Abstract: | Spatiotemporal structures of receptive-fields (RF) have been studied for simple cells in area 18 of eat by measuring the temporal
transfer function (TTF) over different locations (subregions) within the RF. The temporal characteristics of different subregions
differed from each other in the absolute phase shift (APS) to visual stimuli. Two types of relationships can be seen: (i)The
APS varied continuously from one subregion to the next: (ii) A 180°-phase jump was seen as the stimulus position changed somewhere
within the receptive field. Spatiotemporal receptive field profiles have been determined by applying reverse Fourier analysis
to responses in the frequency domain. For the continuous type, spatial and temporal characteristics cannot be dissociated
(space time inseparable) and the spatiotemporal structure is oriented. On the contrary, the spatial and temporal characteristics
for the jumping type can be dissociated (space-time separable) and the structure is not oriented in the space-time plane.
Based on the APSs measured at different subregions, the optimal direction of motion and optimal spatial frequency of neurons
can be predicted.
Project supported by the National Natural Science Foundation of China (Grant Nos. 39570206, 39330110) and the Laboratory of
Visual Information Processing, Chinese Academy of Sciences. |
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Keywords: | visual cortex simple cell receptive field spatiotemporal characteristics response phase direction selectivity |
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