Compulsive foraging behavior associated with use of crack cocaine involves compulsively searching the environment for possibly misplaced pieces of crack. Of 41 crack cocaine addicts evaluated, 33 (80.5%) reported at least some compulsive foraging associated with use of crack; 21 (51.2%) reported such behavior as always associated with crack use. The mean length of time spent in compulsive foraging was 90 minutes. Cocaine-induced foraging may represent a drug-induced model of a type of compulsive behavior.
Cocaine-induced paranoia (CIP) remains an important drug-induced model of idiopathic paranoia for which no psychophysiologic marker has yet emerged. Measures of pupillary oscillation were able to significantly distinguish a group of abstinent crack cocaine abusers endorsing past CIP (n = 32) from another group of crack addicts who denied past CIP (n = 29).
Forty-three chronic schizophrenic veterans had negative symptom, positive symptom, and smooth pursuit eye movement evaluations to determine if the severity of impairment in these dimensions could retrospectively predict their length of military service. For the entire patient group, there was a strong trend for severity of negative symptoms to predict the length of military service (p = 0.055). However, different associations for these variables emerged when the patients were divided into groups with more or less than 2 years of service. The length of military service might serve as a type of "filter" that meaningfully separates out different subtypes of schizophrenic veterans.
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