Abstract
Summary 1. Electrocortical synchronization in cats was studied during various active and quiescent behavioral states. A similar pattern of synchronization occurs in the cortex during the following behaviors: the consumption of milk following the successful performance of a lever-pressing task, ad lib milk consumption, grooming, and drowsiness. This pattern is localized over the dorsal aspect of the lateral (marginal) gyrus and has a dominant frequency of 4–8 c/sec. 2. During various learned behavioral inhibitions, a different pattern of synchronization occurs. This activity is localized over the sensori-motor cortex with a dominant frequency of 12–16 c/sec. The same parameters were found to be characteristic of sleep spindles. 3. Synchronization during slow wave sleep occurs over the entire cortex and is characterized by large 4–12 c/sec activity. 4. These findings suggest that more than one active synchronigenic substrate exists in the brain. The mechanisms involved are operant in both behaviorally active and quiescent states.
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