Effects of clozapine and haloperidol on baseline levels of vacuous jaw movements in aged rats.

Some studies have indicated that aged rats have elevated basal levels of vacuous jaw movements and these vacuous jaw movements are exacerbated by classic neuroleptic drugs like haloperidol, but the effects of the atypical antipsychotic clozapine on vacuous jaw movements in aged rats has not previously been studied. Aged rats were administered daily intraperitoneal injections of either haloperidol (0.04, 0.