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On different types of cross-correlations:
latency, excitability, and spike timing correlations

Carlos Brody

Computation and Neural Systems Program, Caltech.

Three different ways in which the stimulus-driven spiking patterns of two cells may lead to measured cross-correlations between them are described: co-modulations in the overall latency of response, co-modulations in overall excitability, and co-modulations in the fine timing of spike firing. Each of these gives rise to a significant peak in the cross-correlogram of the two cells (even after subtraction of the ``shift predictor''), yet each leads to extremely different effects on postsynaptic cells receiving input from the correlated cells. I present methods to identify which kinds of correlations exist in a data stream.

Tony Zador
Wed Mar 12 22:07:02 PST 1997