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Precisely correlated firing in cells of the lateral geniculate nucleus

Abstract

SIMPLE cells within layer IV of the cat primary visual cortex are selective for lines of a specific orientation. It has been proposed that their receptive-field properties are established by the pattern of connections that they receive from the lateral geniculate nucleus (LGN) of the thalamus1–5. Thalamic inputs, however, represent only a small proportion of the synapses made onto simple cells6–8, and others have argued that corticocortical connections are likely to be important in shaping simple-cell response properties9–11. Here we describe a mechanism that might be involved in selectively strengthening the effect of thalamic inputs. We show that neighbouring geniculate neurons with overlapping receptive fields of the same type (on-centre or off-centre) often fire spikes that are synchronized to within 1 millisecond. Moreover, these neurons often project to a common cortical target neuron where synchronous spikes are more effective in evoking a postsynaptic response. We propose that precisely correlated firing within a group of geniculate neurons could serve to reinforce the thalamic input to cortical simple cells.

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Alonso, JM., Usrey, W. & Reid, R. Precisely correlated firing in cells of the lateral geniculate nucleus. Nature 383, 815–819 (1996). https://doi.org/10.1038/383815a0

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