[Shifts in systemic hemodynamics, local blood flow and brain temperature during stimulation of its structures in a...

Electric stimulation of the midbrain reticular formation, of the anterior and posterior hypothalamus of unrestrained cats entailed local raise of cerebral temperature, increase in the local blood flow, and various changes of the central arterial and venous pressure. The stimulation parameters were lower than thresholds for motor responses. The threshold and suprathreshold stimulation of the stem structures led in 60% of cases to diminishing of the local cerebral blood flow together with the pressor shifts in arterial pressure and the raise of local cerebral temperature. The diminishing of the cerebral blood flow contrdictory to increasing demands of the brain tissue for energy supply, could be accounted for by the generalized excitation of the sympatho-adrenal system and indicated inadequacy of the electric brain stimulation when studying hemodynamic components of the emotional-behavioral responses.