Neural coding properties based on spike timing and pattern correlation of retinal ganglion cells |
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Authors: | Han-Yan Gong Ying-Ying Zhang Pei-Ji Liang Pu-Ming Zhang |
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Institution: | (1) School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-Chuan Road, 200240 Shanghai, China; |
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Abstract: | Correlation between spike trains or neurons sometimes indicates certain neural coding rules in the visual system. In this
paper, the relationship between spike timing correlation and pattern correlation is discussed, and their ability to represent
stimulus features is compared to examine their coding strategies not only in individual neurons but also in population. Two
kinds of stimuli, natural movies and checkerboard, are used to arouse firing activities in chicken retinal ganglion cells.
The spike timing correlation and pattern correlation are calculated by cross-correlation function and Lempel–Ziv distance
respectively. According to the correlation values, it is demonstrated that spike trains with similar spike patterns are not
necessarily concerted in firing time. Moreover, spike pattern correlation values between individual neurons’ responses reflect
the difference of natural movies and checkerboard; neurons cooperate with each other with higher pattern correlation values
which represent spatiotemporal correlations during response to natural movies. Spike timing does not reflect stimulus features
as obvious as spike patterns, caused by their particular coding properties or physiological foundation. As a result, separating
the pattern correlation out of traditional timing correlation concept uncover additional insight in neural coding. |
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Keywords: | Neural coding Spike pattern correlation Spike timing correlation Cross-correlation Lempel–Ziv distance |
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