Disambiguating Different Covariation Types

Creators: Brody, Carlos D.

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Abstract

Covariations in neuronal latency or excitability can lead to peaks in spike train covariograms that may be very similar to those caused by spike timing synchronization (see companion article). Two quantitative methods are described here. The first is a method to estimate the excitability component of a covariogram, based on trial-by-trial estimates of excitability. Once estimated, this component may be subtracted from the covariogram, leaving only other types of contributions. The other is a method to determine whether the covariogram could potentially have been caused by latency covariations.

Additional Information

© 1999 Massachusetts Institute of Technology. Received October 20, 1997; accepted November 25, 1998. Posted Online March 13, 2006. I am grateful to John Hopfield and members of his group, Sanjoy Mahajan, Sam Roweis, and Erik Winfree, for discussion and critical readings of the manuscript for this article. I also thank John Hopfield for support. I thank George Gerstein, Kyle Kirkland, and Adam Sillito for discussion, and the anonymous reviewers for helpful comments. This work was supported by a Fulbright/CONACYT graduate fellowship and by NSF Cooperative Agreement EEC-9402726. All simulations and analyses were done in Matlab 5 (Mathworks, Inc., Natick, MA), except for the latency search, which also used some subroutines hand-compiled into C. The code for all of these, including the code to reproduce each of the figures, can be found at http://www.cns.caltech.edu/~carlos/correlations.html.

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