Information encoding in the inferior temporal visual cortex: contributions of the firing rates and the correlations between the firing of neurons

Authors:
Edmund T. Rolls;Nikolaos C. Aggelopoulos;Leonardo Franco;Alessandro Treves
Affiliations:
Oxford University, Department of Experimental Psychology, UK;Oxford University, Department of Experimental Psychology, UK;Oxford University, Department of Experimental Psychology, UK;Oxford University, Department of Experimental Psychology, UK
Venue:
Biological Cybernetics
Year:
2004

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Abstract

The encoding of information by populations of neurons in the macaque inferior temporal cortex was analyzed using quantitative information-theoretic approaches. It was shown that almost all the information about which of 20 stimuli had been shown in a visual fixation task was present in the number of spikes emitted by each neuron, with stimulus-dependent cross-correlation effects adding for most sets of simultaneously recorded neurons almost no additional information. It was also found that the redundancy between the simultaneously recorded neurons was low, approximately 4% to 10%. Consistent with this, a decoding procedure applied to a population of neurons showed that the information increases approximately linearly with the number of cells in the population.