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Related Experiment Video

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Measuring Delay Discounting in Humans Using an Adjusting Amount Task
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Do the adjusting-delay and increasing-delay tasks measure the same construct: delay discounting?

Andrew R Craig1, Adam D Maxfield, Jeffrey S Stein

  • 1Department of Psychology, Utah State University, Logan, Utah, USA.

Behavioural Pharmacology
|July 1, 2014
PubMed
Summary
This summary is machine-generated.

The adjusting-delay (AD) and increasing-delay (ID) tasks correlate in measuring delay discounting in rats. Task order influenced results, suggesting the ID task may be better for drug studies.

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Area of Science:

  • Behavioral neuroscience
  • Animal behavior research
  • Decision-making studies

Background:

  • Delay discounting quantifies reward devaluation with time.
  • Adjusting-delay (AD) and increasing-delay (ID) tasks are common in animal research.
  • Systematic comparison of AD and ID measures was lacking.

Purpose of the Study:

  • To correlate delay discounting measures from AD and ID tasks.
  • To assess task order effects on discounting measures.
  • To determine the most suitable task for pharmacological research.

Main Methods:

  • Twenty rats underwent 30 sessions of both AD and ID tasks.
  • Task order was counterbalanced across subjects.
  • Quantitative measures of delay discounting were analyzed.

Main Results:

  • Delay discounting measures from AD and ID tasks were positively correlated.
  • Task sequence affected discounting measures; prior exposure reduced discounting.
  • Correlation observed between ID and AD indifference delays.

Conclusions:

  • AD and ID tasks likely measure the same aspect of impulsive choice.
  • Pre-exposure to one task influences discounting in the subsequent task.
  • The ID procedure may be preferable for pharmacological investigations of delay discounting.