Dissonance-Based Eating Disorder Prevention Program Reduces Reward Region Response to Thin Models; How Actions Shape Valuation
Dissonance-Based Eating Disorder Prevention Program Reduces Reward Region Response to Thin Models; How Actions Shape Valuation
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DOI：
10.1371/journal.pone.0144530
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发表时间：
2015-12-07
期刊：
影响因子：
3.7
通讯作者：
Waters, Allison
中科院分区：
文献类型：
--
作者：
Stice, Eric;Yokum, Sonja;Waters, Allison
研究支持了基于失调的饮食失调预防计划的有效性，其中对身体不满的高风险年轻女性批评苗条的理想，这减少了对这种理想的追求，以及失调诱导导致这些影响的理论。基于不和谐通过改变评价的神经表征而产生态度变化的证据，我们测试了完成身体项目是否会减少与奖励评价有关的大脑区域对瘦模型的反应。对身体不满意的年轻女性被随机分配到这种干预或教育控制条件下，完成评估和fMRI扫描，同时在前后观看瘦与平均体重女性模型的图像。全脑分析表明，与对照组相比，身体项目的参与者对瘦模型与平均体重模型的图像的尾状核反应降低更大，尽管两种情况下的参与者在其他大脑区域的反应性上显示出预测试差异，这可能有助于这种效果。更大的前后减少尾状核和壳核反应薄模型与更大的减少身体的不满。身体项目减少尾状核反应薄模型的发现提供了新的初步证据，这种干预减少了媒体图像的价值，认为有助于身体不满和饮食失调，提供支持的干预理论，记录这种干预改变了客观的生物结果。
Research supports the effectiveness of a dissonance-based eating disorder prevention program wherein high-risk young women with body dissatisfaction critique the thin ideal, which reduces pursuit of this ideal, and the theory that dissonance induction contributes to these effects. Based on evidence that dissonance produces attitudinal change by altering neural representation of valuation, we tested whether completing the Body Project would reduce response of brain regions implicated in reward valuation to thin models. Young women with body dissatisfaction were randomized to this intervention or an educational control condition, completing assessments and fMRI scans while viewing images of thin versus average-weight female models at pre and post. Whole brain analyses indicated that, compared to controls, Body Project participants showed greater reductions in caudate response to images of thin versus average-weight models, though participants in the two conditions showed pretest differences in responsivity of other brain regions that might have contributed to this effect. Greater pre-post reductions in caudate and putamen response to thin models correlated with greater reductions in body dissatisfaction. The finding that the Body Project reduces caudate response to thin models provides novel preliminary evidence that this intervention reduces valuation of media images thought to contribute to body dissatisfaction and eating disorders, providing support for the intervention theory by documenting that this intervention alters an objective biological outcome.