R F Schlemmer

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The authors conducted a study in which schizophrenic-like behavioral disturbances were induced in members of a macaque social colony by the chronic administration of d-amphetamine. Animals given the drug showed hypervigilance, hyperactivity, fragmented and repetitive behaviors, and progressive social withdrawal as well as the development of solitary(More)
The effect of six acute doses of the dopamine receptor agonist apomorphine on non-human primate social and individual behaviour was studied in a social colony of four adult Stumptail macaques. Apomorphine was administered intramuscularly to 2 monkeys/day in doses ranging from 0.05 to 3.00 mg kg-1 15 min bfefore a 1 h observation period. Apomorphine induced(More)
An animal model for studying the actions of hallucinogenic drugs using primate social colonies is presented. Although hallucinogens induce a number of behavioral changes in this paradigm, one emergent behavior, limb jerks, appears to be selectively induced by three classes of hallucinogens in doses which correlate with those reported to be hallucinogenic in(More)
The psychotomimetic substance, phencyclidine (PCP), was administered chronically to selected members of a primate social colony. PCP induced stereotyped behavior in all treated monkeys at each of three test doses. Furthermore, there was a significant increase in the amount of stereotypy seen during the second and third weeks of treatment compared to the(More)
The mechanism of clonidine-induced hyperphagia and weight gain in monkeys was studied in 11 Stumptail macaques. Clonidine induced a significant increase in food intake over baseline levels and a significant weight gain after the 3-day treatment period. Both changes induced by clonidine were antagonized by the alpha 2-noradrenergic antagonist yohimbine, but(More)
BMY 14802 was identified as a potential antipsychotic drug in traditional model systems, and this identification was confirmed in modern behavioral and electrophysiological systems. The drug appears to be atypical as an antipsychotic in its lack of activity in models predictive of the potential to produce extrapyramidal side effects and tardive dyskinesia.(More)
The general anesthetic ketamine (Ketalar, Ketaject, Vetalar) (KET) is used in human and veterinary medicine for induction of anesthesia for short surgical procedures and routine veterinary examination. Its illicit use by teenagers in rave parties has been reported, and it has recently been identified as a substance associated with sexual assault. One aim of(More)
The acute and chronic effect of 5-methoxytryptamine (5-MeOT), a structural analogue of known tryptamine hallucinogens and a substance found in mammalian brain, on nonhuman primate behavior was studied in a social colony of four Stumptail macaques. In the first study, dose-dependent behavioral changes induced by 5-MeOT were determined with the administration(More)