Abstract

Electrodes were implanted into the brains of newborn kittens to study chronically the ontogenesis of unit spike and slow-wave phenomena in the somatosensory thalamus and adjacent structures. In general, the upper brain stem and midline (nonspecific) thalamus showed evidences of functional maturation appreciably sooner than the more laterally lying sensory nuclei. State-dependent changes in single-unit behavior began to develop relatively early (fourth postnatal day) and occasional, scattered spike bursts could be seen by the tenth to 14th day, especially during slow wave sleep. However, this scattered, low-density burst pattern, with total absence of synchrony across leads from the same electrode cluster, at a time when runs of thalamic slow waves or spindles are already very obvious, casts considerable doubt on any obligatory relationship between these two phenomena. Alternative functional models for the production of thalamic wave trains are considered.

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