Scientific article
Open access

Stress Increases Cue-Triggered “Wanting” for Sweet Reward in Humans

Published inJournal of experimental psychology. Animal behavior processes, vol. 41, no. 2, p. 128-136
Publication date2015

Stress can increase reward pursuits: This has traditionally been seen as an attempt to relieve negative affect through the hedonic properties of a reward. However, reward pursuit is not always proportional to the pleasure experienced, because reward processing involves distinct components, including the motivation to obtain a reward (i.e., wanting) and the hedonic pleasure during the reward consumption (i.e., liking). Research conducted on rodents demonstrates that stress might directly amplify the cue-triggered wanting, suggesting that under stress wanting can be independent from liking. Here, we aimed to test whether a similar mechanism exists in humans. We used analog of a Pavlovian-Instrumental Transfer test (PIT) with an olfactory reward to measure the cue triggered wanting for a reward but also the sensory hedonic liking felt during the consumption of the same reward. The analog of a PIT procedure, in which participants learned to associate a neutral image and an instrumental action with a chocolate odor, was combined with either a stress-inducing or stress-free behavioral procedure. Results showed that compared with participants in the stress-free condition, those in the stress condition mobilized more effort in instrumental action when the reward-associated cue was displayed, even though they did not report the reward as being more pleasurable. These findings suggest that, in humans, stress selectively increases cue-triggered wanting, independently of the hedonic properties of the reward. Such a mechanism supports the novel explanation proposed by animal research as to why stress often produces cue-triggered bursts of binge eating, relapses in drug addiction, or gambling.

Citation (ISO format)
POOL, Eva et al. Stress Increases Cue-Triggered “Wanting” for Sweet Reward in Humans. In: Journal of experimental psychology. Animal behavior processes, 2015, vol. 41, n° 2, p. 128–136. doi: 10.1037/xan0000052
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Article (Published version)
ISSN of the journal0097-7403

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