Abstract
The multiunit recording technique was used to study the activity of neuron populations in various brain regions in cats during long, natural behavior sequences in a free behavioral situation. Electroencephalographic (EEG) records were also obtained from each recording site. The variations in total multiunit activity levels in many of these regions, including parts of the cortex, thalamus, and reticular formation, tended to be closely related, and these variations in tonic activity were associated with the observed behavioral arousal level of the cat. Variations in tonic activity in other regions (lateral geniculate nucleus and inferior colliculus) were shown to be more reliably correlated with specific sensory input than with arousal levels. Behavioral arousal levels appear to be more closely related to tonic neural activity in many regions of the brain than to the EEG record. The neural bases of specific-center and drive-arousal theories of motivation are examined in the light of these data.
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