Data Archive of the Animal Cognition Lab

University of Georgia

Catalog Number: 0004

Title: Cannabinoid Modulation of Sensitivity to Time2

Reference: Crystal, J.D., Maxwell, K.W., & Hohmann, A.G. (2003). Cannabinoid modulation of sensitivity to time. Behavioural Brain Research, 144, 57-66.

Note: These data were reported as Experiment 2 by Crystal, Maxwell, & Hohmann (2003). For list of assignment of rats to drug and dose conditions see below.

ABSTRACT

The present studies used a psychophysical approach to examine the effect of cannabinoids on temporal processing. Rats trained to discriminate 2- and 8-s (Experiment 1, n = 72) and 4- and 16-s (Experiment 2, n = 60) intervals were tested with intermediate durations. Psychophysical functions for time, relating the probability of judging a duration as “long” as a function of the actual stimulus durations, were characterized by measures of central tendency (point of subjective equality, PSE) and variability (Weber fraction, WF). The potent cannabinoid agonist, WIN55,212-2 (1-3 mg/kg), produced a dose-related decrease in sensitivity to time (i.e., increase in WF) without systematically affecting PSE (Experiments 1 and 2). The central cannabinoid CB1 antagonist, SR141716A (1-3 mg/kg), did not alter either the WF or PSE (Experiments 1 and 2). Coadministration of SR141716A with WIN55,212-2 blocked the effect of the agonist on WF (Experiment 2), suggesting that the WF effect is mediated by actions at cannabinoid CB1 receptors. Computational modeling with an information processing theory of timing suggests that the reduction in sensitivity to time can be attributed to a disorder of attention.

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Last updated 26 August 2003