title: Visual effects of opiates in pigeons: I. Target location in visual search.
abstract: Pigeons pecked at target forms, located in arrays of distractors. In experiment 1 the number of distractors and their similarity to the target varied. In experiment 2, similarity was varied over a more extended range. Drug tests used morphine in doses ranging from 1 to 6 mg/kg, naloxone (0.3-3 mg/kg) alone and combined with morphine. Morphine had relatively small effects on accuracy; however, it produced pronounced elevations in reaction time. Significant interactions with display variables indicated a visual component to the morphine effect. Naloxone alone had no effect; naloxone combined with morphine blocked the morphine effect.
authors.affiliation: Department of Psychology, Brown University, Providence, RI 02912.
authors.forename: P M
authors.initials: PM
authors.lastname: Blough
authors.forename: D S
authors.initials: DS
authors.lastname: Blough
mesh_terms: D000818:Animals; D010856:Columbidae; D004305:Dose-Response Relationship, Drug; D009020:Morphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology; D009294:Narcotics / Q000494:pharmacology*; D014785:Vision, Ocular / Q000187:drug effects*
chemical_list: D009294:Narcotics; D009270:Naloxone; D009020:Morphine