Synergy from Silence in a Combinatorial Neural Code

Details Synergy from Silence in a Combinatorial Neural Code Synergy from Silence in a Combinatorial Neural Code

2006-07-13

arxiv.org/abs/q-bio/0607017v1

Biology

Quantitative Biology

Neurons and Cognition

9 pages, 6 figures

Scientific paper

The manner in which groups of neurons represent events in the external world is fundamental to neuroscience. Here, we analyze the population code of the retina during naturalistic stimulation and show that the information conveyed by specific multi-neuronal firing patterns can be very different from the sum of the pattern's parts. Synchronous spikes convey more information than either of the participating cells, but almost always less than their sum, making them redundant coding symbols. Surprisingly, patterns of spiking and silence are mostly synergistic - carrying information that is accessible only by observing the whole pattern of activity, rather than its components, and signifying unique features in the stimulus. These results demonstrate that the retina uses a combinatorial code and that the brain can benefit significantly from recognizing multi-neuronal firing patterns.

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