Functional and spatial correlation structure in the primary visual cortex of monkey

O Piamenta-Mendels, A Kohn, M Shamir

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Theoretical studies have shown that correlations in the
trial to trial fluctuations of the neural responses to
external stimuli may limit the information content that
can be extracted from the neural responses. Here we use
simultaneous recordings of large neural populations in
the primary visual cortex of monkey to study these
correlations and investigate their effect on the ability
of the population response to reliably encode the orientation
visual stimuli.
We find that most cell pairs show significant correlations.
Analysis of the spectrum of the correlation matrix
reveals a non-trivial correlation structure. However, analyzing
the accuracy of the population vector and optimal
linear readout we find that the considerable noise
correlations do not limit their accuracy, in contrast to
the theoretical prediction. Further analysis of the underlying
structure of the correlations reveals that this nontrivial
structure is spatial (i.e., structure that respects the
physical position of the neurons) rather than functional
(i.e., structure that respects the stimulus features which
the neuron is most sensitive for).
Original languageEnglish GB
Title of host publicationJOURNAL OF MOLECULAR NEUROSCIENCE
Pagess92-s93
Number of pages2
Volume51
DOIs
StatePublished - 2013

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