A dual-process approach to exploring the role of delay discounting in obesity

Menna Price, Suzanne Higgs, James Maw, Michelle Lee

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
228 Downloads (Pure)

Abstract

Delay discounting of financial rewards has been related to overeating and obesity. Neuropsychological evidence supports a dual-system account of both discounting and overeating behaviour where the degree of impulsive decision making is determined by the relative strength of reward desire and executive control. A dual-parameter model of discounting behaviour is consistent with this theory. In this study, the fit of the commonly used one-parameter model was compared to a new dual-parameter model for the first time in a sample of adults with wide ranging BMI. Delay discounting data from 79 males and females (males=26) across a wide age (M=28.44years (SD=8.81)) and BMI range (M=25.42 (SD=5.16)) was analysed. A dual-parameter model (saturating-hyperbolic; Doya, [Doya (2008) ]) was applied to the data and compared on model fit indices to the single-parameter model. Discounting was significantly greater in the overweight/obese participants using both models, however, the two parameter model showed a superior fit to data (p<0.0001). The two parameters were shown to be related yet distinct measures consistent with a dual-system account of inter-temporal choice behaviour. The dual-parameter model showed superior fit to data and the two parameters were shown to be related yet distinct indices sensitive to differences between weight groups. Findings are discussed in terms of the impulsive reward and executive control systems that contribute to unhealthy food choice and within the context of obesity related research.

Original languageEnglish
JournalPhysiology and Behavior
Early online date13 Feb 2016
DOIs
Publication statusE-pub ahead of print - 13 Feb 2016

Keywords

  • Obesity
  • Delay discounting
  • Dual-process
  • Two-parameter
  • Model

Fingerprint

Dive into the research topics of 'A dual-process approach to exploring the role of delay discounting in obesity'. Together they form a unique fingerprint.

Cite this