Several experimental procedures (e.g., adjusting amount, adjusting delay) have been used to study the effect that changes in amount of and delay to a reward have on the reward’s subjective value. The present series of three experiments sought to test the implicit assumption that the underlying decision-making process (discounting) is identical regardless of the procedure used, and that all would converge on similar indifference points. For each of the experiments, participants were initially tested on one of the adjusting tasks (Adjusting Immediate Amount, Adjusting Delayed Amount, or Adjusting Delay) and returned a week later to complete each of the remaining adjusting tasks. The indifference points obtained from the initial adjusting task were used as the test parameters in the other two tasks. That is, when participants completed the other two adjusting tasks, the amounts and delays experienced were identical to those from the initial adjusting task. Since, in the other adjusting tasks, the participants experience the identical amounts and delays as the initial adjusting task, specific predictions, at the level of the individual, were possible. Participants in all three experiments also completed a fully randomized version of the initial choice task. The results confirmed that, regardless of the choice task used, subjective value decreased as the delay to that outcome increased. In addition, it was found that under the adjusting-delay and the adjusting-delayed-amount tasks, but not under the adjusting-immediate-amount task, subjective value was determined not just by the amount of the outcome or the delay to its receipt, but to some degree by the manner in which the choices are presented (i.e., the context). Therefore, when investigating intertemporal choice, the adjusting-immediate-amount procedure appears to provide the most reliable and valid estimates of indifference between immediate and delayed outcomes.
|Commitee:||Connor, Lisa, Hale, Sandra, Myerson, Joel, Sommers, Mitchell|
|School:||Washington University in St. Louis|
|School Location:||United States -- Missouri|
|Source:||DAI-B 70/09, Dissertation Abstracts International|
|Keywords:||Adjusting amount, Adjusting delay, Decision-making, Reward, Temporal discounting|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be