Dec 11, 2003

Apomorphine-induced prepulse inhibition disruption is associated with a paradoxical enhancement of prepulse stimulus reactivity

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
Benjamin K YeeJoram Feldon


Prepulse inhibition (PPI) refers to the reduction in startle reaction to a startle-eliciting stimulus when it is shortly preceded by a subthreshold prepulse stimulus. PPI has been extensively employed as an assay for sensorimotor gating, and its disruption has been characterized in specific disease conditions, including schizophrenia. In animals, dopamine agonists disrupt PPI, and this disruption can be antagonized by antipsychotic drug treatment. The present study extended these fundamental findings to C57BL6 mice, and further evaluated the subjects' reaction to the prepulse stimulus alone in relation to the expression of PPI. Not only did apomorphine (2.0 mg/kg, intraperitoneal (i.p.)) attenuate PPI but it also enhanced reactivity to the prepulse stimulus. The dual effects of apomorphine appear paradoxical in view of the positive correlation, detectable in both the control and apomorphine groups, between prepulse reactivity and PPI magnitude. The present findings contradict the hypothesis that apomorphine disrupts PPI via reduced detectability or perception of the prepulse, and we further propose that enhanced distractibility may provide a parsimonious account for the dual effects of apomorphine. Moreover, haloperidol pretrea...Continue Reading

Mentioned in this Paper

Dopamine Agonists [MoA]
Behavior, Animal
Assay OF Haloperidol
Startle Reaction
Prepulse Inhibition Activity
Acoustic Stimulation
Antipsychotic Agents

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