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(Neural Computation. 2006;18:2583-2591.)
© 2006 The MIT Press

Note

Spike Count Correlation Increases with Length of Time Interval in the Presence of Trial-to-Trial Variation

Robert E. Kass

kass{at}stat.cmu.edu

Valérie Ventura

vventura{at}stat.cmu.edu Department of Statistics and Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA 15213, U.S.A.

It has been observed that spike count correlation between two simultaneously recorded neurons often increases with the length of time interval examined. Under simple assumptions that are roughly consistent with much experimental data, we show that this phenomenon may be explained as being due to excess trial-to-trial variation. The resulting formula for the correlation is able to predict the observed correlation of two neurons recorded from primary visual cortex as a function of interval length.






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