Original Articles

Visual stimuli modulate precise synchronous firing within the thalamus

Jose-Manuel Alonso^a1 c1, Chun-I Yeh^a1a2 p1 and Carl R. Stoelzel^a2

^a1 Department of Biological Sciences, SUNY-Optometry, New York, USA

^a2 Department of Psychology, University of Connecticut, Storrs, Connecticut, USA

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

• LGN;
• retinogeniculate;
• correlated firing;
• visual cortex;
• spike timing;
• thalamocortical

Correspondence:

^c1 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

^p1 Current address: Center for Neural Science, New York University, New York, USA