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Behavioral pharmacology and timing.

Amy L. Odum1

  • 1Department of Psychology, University of New Hampshire, Conant Hall, 10 Library Way, 03824, Durham, NH, USA

Behavioural Processes
|April 12, 2002
PubMed
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Drug effects on behavior depend on the baseline rate, with low rates increasing and high rates decreasing. This study challenges neuropharmacological timing models, favoring rate dependency explanations for drug-induced behavioral changes.

Area of Science:

  • Neuropharmacology
  • Behavioral Neuroscience
  • Psychopharmacology

Background:

  • Drug effects on behavior are often explained by rate dependency: effects vary with baseline response rate.
  • Temporal discrimination is an alternative interpretation for drug effects on patterned behavior.

Purpose of the Study:

  • To investigate whether drug effects on temporal tasks align with rate dependency or temporal discrimination models.
  • To test predictions from a neuropharmacological information-processing model of timing.

Main Methods:

  • Utilized a multiple schedule with two components: short (5s) and long (30s) food-available durations.
  • Administered drugs targeting putative clock and memory stages of a timing model.
  • Assessed drug effects on response rates and temporal accuracy.

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Main Results:

  • Observed drug effects consistent with rate dependency across different temporal conditions.
  • Results did not strongly support the neuropharmacological interpretation of scalar expectancy theory.
  • Rate dependency emerged as a more consistent explanatory principle than specific timing model predictions.

Conclusions:

  • Drug effects on temporally patterned behavior are better explained by rate dependency than by specific neuropharmacological models of timing.
  • Highlights the need for timing models that incorporate the empirical generalization of rate dependency.