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Visual stimuli modulate precise synchronous firing within the thalamus

Published online by Cambridge University Press:  04 January 2008

Jose-Manuel Alonso,
Chun-I Yeh and
Carl R. Stoelzel
Jose-Manuel Alonso*
Affiliation:
Department of Biological Sciences, SUNY-Optometry, New York, USA
Chun-I Yeh
Affiliation:
Department of Biological Sciences, SUNY-Optometry, New York, USADepartment of Psychology, University of Connecticut, Storrs, Connecticut, USA
Carl R. Stoelzel
Affiliation:
Department of Psychology, University of Connecticut, Storrs, Connecticut, USA
*
Correspondence should be addressed to: Jose-Manuel Alonso, State University of New York, State College of Optometry, 33 West, 42nd street, 17th floor, New York, NY 10036, USA phone: 212-938-5573 fax: 212-938-5796 email: jalonso@sunyopt.edu
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Abstract

The work of Mircea Steriade demonstrated that the neocortex could synchronize large regions of the thalamus within 10−100 msec. Unlike the synchrony generated by the cortex, the retinal afferents synchronize a restricted group of neighboring thalamic neurons with <1-msec precision. Here, we use a large sample (n = 372) of simultaneous recordings from neighboring neurons in the lateral geniculate nucleus (LGN) to illustrate the high specificity of the synchrony generated by retinal afferents and its dependency on sensory stimulation. First, we demonstrate that cells sharing a retinal afferent show a balanced receptive field diversity: although slight receptive field mismatches are common, the largest mismatches in a specific property (e.g. receptive field size) are restricted to cells that are precisely matched in other properties (e.g. receptive field overlap). Second, we show that these receptive field mismatches are functionally important and can lead to a 5-fold variation in the percentage of synchronous spikes driven by the shared retinal afferent under different stimulus conditions. Based on these and other findings, we speculate that the precise synchronous firing of cells sharing a retinal afferent might serve to amplify local stimuli that might be too brief and small to generate a large number of thalamic spikes.

Keywords

LGNretinogeniculatecorrelated firingvisual cortexspike timingthalamocortical

Information

Type
Original Articles
Information
Thalamus & Related Systems , Volume 4 , Issue 1 , March 2008, pp. 21 - 34
Copyright
Copyright © Cambridge University Press 2008

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