Lateral hypothalamic regulation of electrocortical activity.

The EEG power spectrum of normal and split-brain cats was analysed before and after unilateral hypothalamic lesion at sites which prior to lesion had ICSS or aversive properties on stimulation, and which gave rise to sensorimotor neglect after lesion. A filter-gain function was calculated to describe the lesions' effect upon the ipsilateral EEG spectrum in stable conditions, and was found to be approximated by a specific gamma function. This partially defines the action that the lateral hypothalamus may exert on electrocortical activity.