Junk-food enhances conditioned food cup approach to a previously established food cue, but does not alter cue potentiated feeding; implications for the effects of palatable diets on incentive motivation

PHYSIOLOGY & BEHAVIOR

卷:192

Article; Proceedings Paper

Derman, Rifka C.¹  Ferrario, Carrie R.^1,2 

[1] Univ Michigan, Dept Pharmacol, Ann Arbor, MI 48109 USA

[2] Univ Michigan, Neurosci Grad Program, Ann Arbor, MI 48109 USA

关键词: Obesity;    Incentive motivation;    Food cues;    Striatum;    Behavior;    Pavlovian conditioning;   

DOI  :  10.1016/j.physbeh.2018.03.012

来源: Elsevier

【 摘 要 】

Efforts to stem the global rise in obesity have been minimally effective, perhaps in part because our understanding of the psychological and behavioral drivers of obesity is limited. It is well established that stimuli that are paired with palatable foods can powerfully influence food-seeking and feeding behaviors. However, how consumption of sugary, fatty junk-foods affects these motivational responses to food cues is poorly understood. Here, we determined the effects of short- and long-term junk-food consumption on the expression of cue potentiated feeding and conditioned food cup approach to Pavlovian conditioned stimuli (CS). Further, to determine the degree to which effects of junk-food were selective to Pavlovian motivational processes, we varied the predictive validity of the CS by including training groups conditioned with unique CS-US contingencies ranging from -1.0 to +1.0. Junk-food did not enhance cue potentiated feeding in any group, but expression of this potentiation effect varied with the CS-US contingency independent of diet. In contrast, junk-food consistently enhanced conditioned approach to the food cup; this effect was dependent on the previously established CS-US contingency. That is, consumption of junk-food following training enhanced approach to the food cup only in response to CSs with previously positive CS-US contingencies. This was accompanied by reduced motivation for the US itself. Together these data show that junk-food consumption selectively enhances incentive motivational responses to previously established food CSs, without altering cue potentiated feeding induced by these same CSs, and in the absence of enhanced motivation for food itself.

【 授权许可】

Free