PMID: 4292908Sep 1, 1967Paper

Nature of thalamo-cortical relations during spontaneous barbiturate spindle activity

The Journal of Physiology
P AndersenT Lomo

Abstract

1. The relation between thalamic and cortical spontaneous spindles was investigated in cats anaesthetized with barbiturates.2. Simultaneous recordings with multiple electrodes in the thalamus and cortex revealed a high correlation between thalamic and cortical spindle activity, both with regard to the occurrence of the spindles as well as to their individual waves, provided a critical location of the electrodes was secured. The results indicate a point-to-point relation between a group of thalamic cells and a small cortical area to which these cells project. In the spontaneous rhythm, the cortical columns are probably individually controlled by a thalamic rhythmic entity. This point-to-point relation was found in all the major sensory projection systems and in one thalamic ;association' nucleus and its corresponding ;association' cortex.3. Cortical barbiturate spindles appeared either as local spindles in a restricted cortical area or as compound spindles in several areas. Spindles recorded from electrodes separated by 2 mm or more were clearly different with regard to intraspindle wave frequency, duration, and the time of start and stop of the spindle. These differences increased with increasing distance between the electrodes...Continue Reading

Citations

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