A time course analysis of satiety-induced instrumental outcome devaluation
Learn Behav. 2016-04-29; 44(4): 347-355
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1. Learn Behav. 2016 Dec;44(4):347-355.
A time course analysis of satiety-induced instrumental outcome devaluation.
Parkes SL(1)(2)(3), Marchand AR(4)(5), Ferreira G(6)(5), Coutureau E(4)(5).
(1)INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, 33076, Bordeaux, France.
(2)CNRS, Institut de Neurosciences Cognitives et Intégratives d’Aquitaine, UMR
5287, 33076, Bordeaux, France. .
(3)Université de Bordeaux, 33076, Bordeaux, France. .
(4)CNRS, Institut de Neurosciences Cognitives et Intégratives d’Aquitaine, UMR
5287, 33076, Bordeaux, France.
(5)Université de Bordeaux, 33076, Bordeaux, France.
(6)INRA, Nutrition et Neurobiologie Intégrée, UMR 1286, 33076, Bordeaux, France.
Sensory-specific satiety is commonly used in studies of decision making to
selectively devalue a food reward. Devaluation is reflected in an immediate
reduction in the subsequent intake of the food and in the performance of actions
that gain access to that food. Despite its frequent use, the lasting effects of
satiety-induced devaluation on instrumental actions are unknown. Here, we
examined the time course and contextual dependency of sensory-specific
satiety-induced devaluation on instrumental responding and consumption. Rats were
trained to perform two instrumental actions for two distinct food rewards. Then,
one of the instrumental outcomes was provided ad libitum for 1 hour in separate
feeding cages and the effect of this devaluation was assessed 0, 2, or 5 hours
after satiation. At a delay of 0 or 2 hours, both intake and instrumental
responding were sensitive to the satiety treatment. That is, rats consumed less
of the devalued outcome and responded less for the devalued outcome than for the
valued outcome. By contrast, after 5 hours, rats showed sensitivity to
devaluation in consumption but not in instrumental responding. Strikingly,
sensitivity to devaluation was restored for the instrumental response after a
5 hour delay when devaluation was performed in the instrumental context. These
results indicate that, in rats, specific satiety-induced devaluation endures and
is context-independent for up to 2 hours post-satiation. At longer delays, the
impact of sensory-specific satiety on instrumental responding is
context-dependent, suggesting that contextual cues may be required for the value
of specific outcomes to control instrumental responding.
PMID: 27129787 [Indexed for MEDLINE]