CIRCUS MOVEMENTS AND EXCITATION OF STRIATAL AND MESODIENCEPHALIC CENTERS IN RABBITS

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Abstract
The forced circus movements induced by unilateral electrostimulation or micrometer syringe injections of diisoprophylfluorophosphate (DFP) into various brain areas of unanesthetized rabbits were compared. Electrical excitation of the candate nucleus evoked contraversive circling whereas similar stimulation of mesodiencephalic centers produced ipsiversive turning. DFP injected into these same areas caused circus movements which were in the same direction as those obtained with electrostimulation. Contraversive circling was also induced by injections of DFP into the medulla. DFP did not, however, elicit motor responses from the motor cortex or central white matter. Furthermore, circling was not induced by electrical stimulation of the cerebral cortex but contraversive deviation of the head was frequently noted.

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