Inducing negative affect increases the reward value of appetizing foods in dieters.
Inducing negative affect increases the reward value of appetizing foods in dieters.
复制标题
诱发负面情绪会增加节食者对开胃食物的奖励价值。
DOI：
10.1162/jocn_a_00238
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发表时间：
2012
影响因子：
3.2
通讯作者：
Heatherton,ToddF
中科院分区：
文献类型：
--
作者：
Wagner,DylanD;Boswell,RebeccaG;Kelley,WilliamM;Heatherton,ToddF
对于节食者、吸烟者和吸毒者来说，在自我控制能力下降之前，经常会经历负面情绪。实验室研究也同样表明，引发负面情绪困扰会增加食物或药物的消耗。这一发现的一个假设是，情绪困扰会使大脑的奖励系统对食欲刺激变得敏感。使用功能性神经影像学，我们证明，在长期节食者中引起负面影响会增加大脑区域的活动，这些区域代表在看到开胃食物线索时食欲刺激的奖励价值。 30 名女性长期节食者被随机分配接受消极情绪诱导 (n = 15) 或中性情绪诱导 (n = 15)，随后在功能磁共振成像期间暴露于令人垂涎的食物和自然场景的图像。与处于中性情绪的长期节食者相比，那些接受消极情绪诱导的人在OFC中对开胃食物图像的活动增加。此外，OFC和腹侧纹状体中对食物图像的活动与消极情绪诱导降低参与者自尊程度的个体差异相关。这些发现表明，痛苦使大脑的奖励系统对食欲线索变得敏感，从而为负面情绪和不受抑制的饮食之间经常观察到的关系提供了一种机制。
Experiencing negative affect frequently precedes lapses in self-control for dieters, smokers, and drug addicts. Laboratory research has similarly shown that inducing negative emotional distress increases the consumption of food or drugs. One hypothesis for this finding is that emotional distress sensitizes the brain's reward system to appetitive stimuli. Using functional neuroimaging, we demonstrate that inducing negative affect in chronic dieters increases activity in brain regions representing the reward value of appetitive stimuli when viewing appetizing food cues. Thirty female chronic dieters were randomly assigned to receive either a negative (n= 15) or neutral mood induction (n= 15) immediately followed by exposure to images of appetizing foods and natural scenes during fMRI. Compared with chronic dieters in a neutral mood, those receiving a negative mood induction showed increased activity in the OFC to appetizing food images. In addition, activity to food images in the OFC and ventral striatum was correlated with individual differences in the degree to which the negative mood induction decreased participants' self-esteem. These findings suggest that distress sensitizes the brain's reward system to appetitive cues, thereby offering a mechanism for the oft-observed relationship between negative affect and disinhibited eating.