Related Experiment Video
Updated: Jul 7, 2026

Measuring Delay Discounting in Humans Using an Adjusting Amount Task
Published on: January 9, 2016
Turning k on its head: comments on use of an ED50 in delay discounting research
Jin H Yoon1, Stephen T Higgins
1Departments of Psychiatry, University of Vermont, Burlington, VT 05401, USA. jhyoon@uvm.edu
Abstract:
Delay discounting (DD) describes how the value of a reinforcer decreases as delay to its delivery increases. Relationships between DD and various aspects of drug abuse have been demonstrated reliably. A potential barrier to wider adoption of DD techniques is that results are often expressed in terms that may be too abstract or unfamiliar to a broader audience, particularly when describing or comparing hyperbolic DD functions or values of k. In an effort to potentially make DD results more accessible, the current report explores use of an ED50 value in characterizing DD functions, similar to that used in pharmacology research for characterizing dose-effect functions. The ED50 proposed with regard to DD is the delay that is effective in discounting the subjective value of the delayed reinforcer by 50%. Additionally, a convenient method for calculating ED50 values for DD is discussed.
Related Concept Videos
Pharmacodynamic Models: Emax Drug–Concentration Effect Model
Pharmacodynamic Models: Linear Concentration–Effect Model
Timing and Consequences on Behavior
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant factor...
Pharmacokinetic–Pharmacodynamic Relationship: Model Components
Pharmacodynamic Models: Direct Effect Model and Indirect Response Model
Framing Effects

