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Control of Spatiotemporal Coherence of a Thalamic Oscillation by Corticothalamic Feedback

by: Diego Contreras, Alain Destexhe, Terrence J. Sejnowski, Mircea Steriade
Science, Vol. 274, No. 5288. (01 November 1996), pp. 771-774, doi:10.1126/science.274.5288.771  Key: citeulike:7748929

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Abstract

The mammalian thalamus is the gateway to the cortex for most sensory modalities. Nearly all thalamic nuclei also receive massive feedback projections from the cortical region to which they project. In this study, the spatiotemporal properties of synchronized thalamic spindle oscillations (7 to 14 hertz) were investigated in barbiturate-anesthetized cats, before and after removal of the cortex. After complete ipsilateral decortication, the long-range synchronization of thalamic spindles in the intact cortex hemisphere changed into disorganized patterns with low spatiotemporal coherence. Local thalamic synchrony was still present, as demonstrated by dual intracellular recordings from nearby neurons. In the cortex, synchrony was insensitive to the disruption of horizontal intracortical connections. These results indicate that the global coherence of thalamic oscillations is determined by corticothalamic projections.


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