Document Detail


Effects of multiple delayed rewards on delay discounting in an adjusting amount procedure.
MedLine Citation:
PMID:  14580698     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
It has been suggested that when the delivery of several rewards is separated in time, e.g. one reward immediately and a second reward a few moments later, the value of an alternative that includes these "bundled" rewards will be the sum of the hyperbolic discount functions of the individual rewards. The current study examined this hypothesis using an adjusting amount procedure. In this procedure, rats chose between a delayed food alternative and an immediate food alternative, where the amount of immediate food altered according to each rat's choices. The size of the immediate reward when rats were indifferent between the delayed and immediate alternatives indexed the value of the delayed alternative. Discount functions describing the relationship between the indifference points and the delay to food were created for conditions in which the delay alternative consisted of a single reward (150mul of sucrose solution) delayed by 0, 2, 4, 8, or 16s following the reinforced response. These functions were used to predict the indifference points in other conditions for which an additional 150mul of sucrose solution was delivered at 0, 4, 8, or 16s following the reinforced response. The model fit the data well. However, there were systematic deviations that suggested animals were sensitive to the context within which delays were presented, in addition to the delays themselves. That is, preference for the delayed alternative was lower than predicted when the delay to the additional reward was long (8 or 16s) and higher than the predicted values when it was short (0 or 4s).
Authors:
Suzanne H. Mitchell; Abigail J. Rosenthal
Related Documents :
15135338 - The role of sensitivity to external food cues in attentional allocation to food words o...
24944778 - Dietary changes in vietnamese marriage immigrant women: the koges follow-up study.
12884078 - Tufted capuchins (cebus apella) attribute value to foods and tools during voluntary exc...
25343878 - The influence of food texture and liquid consistency modification on swallowing physiol...
24293188 - Antimicrobial activity of nisin, thymol, carvacrol and cymene against growth of candida...
23140728 - Visible micro-raman spectroscopy for determining glucose content in beverage industry.
Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Behavioural processes     Volume:  64     ISSN:  1872-8308     ISO Abbreviation:  Behav. Processes     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-Oct-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7703854     Medline TA:  Behav Processes     Country:  -    
Other Details:
Languages:  ENG     Pagination:  273-286     Citation Subset:  -    
Affiliation:
Departments of Behavioral Neuroscience & Psychiatry, L-470, Oregon Health & Science University, 97239, Portland, OR, USA
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Effects of reinforcer magnitude on an animal model of impulsive behavior.
Next Document:  Measurement of delay discounting using trial-by-trial consequences.