Effects of cocaine on simple reaction times and sensory thresholds in baboons.

Robert D Hienz, D. J. Spear, D. A. Bowers

Research output: Contribution to journalArticle

Abstract

The effects of chronic, daily administration of cocaine on auditory and visual reaction times and thresholds were studied in baboons. Single intramuscular injections of cocaine hydrochloride (0.1 to 5.6 mg/kg) were given once daily for periods of 10 to 25 days, and were followed immediately by psychophysical tests designed to assess cocaine's effects on simple reaction times as on auditory and visual threshold functions. Consistent reductions in reaction times were frequently observed over the cocaine dose range of 0.32 to 1.0 mg/kg; at higher doses, either decreases or increases in reaction times were observed, depending upon the animal. Lowered reaction times generally occurred immediately following the 1st day's cocaine injection, and continued through all subsequent days during the dose administration period, suggesting little development of tolerance or sensitivity to these reaction-time effects. Reaction-time decreases showed a U-shaped dose-effect function. The greatest decreases in reaction times occurred from 0.32 to 1.0 mg/kg, and produced an average reaction-time decrease of 10 to 12%. Concurrently measured auditory and visual thresholds showed no systematic changes as a function of cocaine dose. Pausing was observed during performance of the psychophysical tasks, with the length of total session pause times being directly related to cocaine dose.

Original languageEnglish (US)
Pages (from-to)231-246
Number of pages16
JournalJournal of the Experimental Analysis of Behavior
Volume61
Issue number2
StatePublished - Mar 1994

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Sensory Thresholds
Papio
Cocaine
Reaction Time
Auditory Threshold
Intramuscular Injections
Task Performance and Analysis

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Psychology(all)
  • Experimental and Cognitive Psychology
  • Neuropsychology and Physiological Psychology

Cite this

Effects of cocaine on simple reaction times and sensory thresholds in baboons. / Hienz, Robert D; Spear, D. J.; Bowers, D. A.

In: Journal of the Experimental Analysis of Behavior, Vol. 61, No. 2, 03.1994, p. 231-246.

Research output: Contribution to journalArticle

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