“…According to this hypothesis, blockade of DA-receptors in animals results in protection against apomorphineinduced stereotypies and emesis, and, as a result of attenuation of striatal transmission, in the development of catalepsy. In man, production of psychotic experiences is inhibited, and a Parkinson-like syndrome develops (2,10). Extrapyramidal effects were considered indispensable for an antipsychotic agent, and indeed, some clinicians (11) considered the therapeutic dose level of a neuroleptic to be reached only when extrapyramidal effects appeared.…”