Visual effects of opiates in pigeons. III. Luminance and wavelength sensitivity.

Full Abstract

In a psychophysical task that permitted dissociations among sensitivity, overall stimulus control, and bias, pigeons learned to discriminate among stimuli along separate wavelength and luminance dimensions. Subsequent tests followed injections of morphine (1-8 mg/kg) and morphine plus naloxone (3 mg/kg). Morphine decreased sensitivity to both dimensions, and reduced overall control by luminance. These effects were reduced or reversed by naloxone. Morphine's effects appeared more pronounced for luminance than for wavelength stimuli. There were no consistent drug effects on response bias.

Author information

Author/s: Bradley, D V (DV); Blough, P M (PM);

Affiliation: Brown University, Dept of Psychology, Providence, RI 02912.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.

Journal: Psychopharmacology (Psychopharmacology (Berl)), published in GERMANY. (Language: eng)

Reference: 1993-; vol 111 (issue 1) : pp 117-22

Dates: Created 1995/03/29; Completed 1995/03/29; Revised 2008/11/21;

PMID: 7870926, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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