EEG effects of the ventricular cerebrospinal fluid of rabbits submitted to thalamic stimulation.

Electrical stimulation of the "somnogenic" thalamic area of Hess in chronic rabbit donors significantly increases the EEG delta activity against controls (41%; p less than or equal to 0.05). In recipient rabbits infused with cerebrospinal fluid (csf) from these donors, the delta increase against control rabbits (26%) suggests a sedative activity of the infused csf, able to counteract the waking tendency in chronic recipients.