Department of Psychological and Behavioural Science, London School of Economics and Political Science, Houghton Street, London WC2A 2AE, UK.
Kedge Business School, Domaine de Luminy, Rue Antoine Bourdelle, 13009 Marseille France.
Appetite. 2018 Sep 1;128:242-254. doi: 10.1016/j.appet.2018.06.009. Epub 2018 Jun 12.
Every day, people are exposed to images of appetizing foods that can lead to high-calorie intake and contribute to overweight and obesity. Research has documented that manipulating the visual perspective from which eating is viewed helps resist temptation by altering the appraisal of unhealthy foods. However, the neural basis of this effect has not yet been examined using neuroimaging methods. Moreover, it is not known whether the benefits of this strategy can be observed when people, especially overweight, are not explicitly asked to imagine themselves eating. Last, it remains to be investigated if visual perspective could be used to promote healthy foods. The present work manipulated camera angles and tested whether visual perspective modulates activity in brain regions associated with taste and reward processing while participants watch videos featuring a hand grasping (unhealthy or healthy) foods from a plate during functional magnetic resonance imagining (fMRI). The plate was filmed from the perspective of the participant (first-person perspective; 1PP), or from a frontal view as if watching someone else eating (third-person perspective; 3PP). Our findings reveal that merely viewing unhealthy food cues from a 1PP (vs. 3PP) increases activity in brain regions that underlie representations of rewarding (appetitive) experiences (amygdala) and food intake (superior parietal gyrus). Additionally, our results show that ventral striatal activity is positively correlated with body mass index (BMI) during exposure to unhealthy foods from a 1PP (vs. 3PP). These findings suggest that unhealthy foods should be promoted through third-person (video) images to weaken the reward associated with their simulated consumption, especially amongst overweight people. It appears however that, as such, manipulating visual perspective fails to enhance the perception of healthy foods. Their promotion thus requires complementary solutions.
每天，人们都会接触到令人垂涎欲滴的食物图像，这可能导致高热量摄入，并导致超重和肥胖。研究表明，通过改变对不健康食物的评价，改变进食的视觉视角有助于抵制诱惑。然而，目前还没有使用神经影像学方法来检验这种影响的神经基础。此外，当人们（尤其是超重者）没有被明确要求想象自己在吃东西时，这种策略的好处是否可以观察到，目前还不得而知。最后，还需要研究视觉视角是否可以用于促进健康食品。本研究通过改变摄像机角度，测试了当参与者观看一只手从盘子里抓取（不健康或健康）食物的视频时，视觉视角是否会调节与味觉和奖励处理相关的大脑区域的活动，同时使用功能磁共振成像（fMRI）进行测试。盘子从参与者的视角（第一人称视角；1PP）或从正面视角（好像在看别人吃东西）拍摄（第三人称视角；3PP）。我们的研究结果表明，仅仅从 1PP（而不是 3PP）观看不健康的食物线索会增加与奖励（渴望）体验和食物摄入相关的大脑区域的活动（杏仁核）和顶骨上回。此外，我们的研究结果表明，在暴露于 1PP（而非 3PP）的不健康食物时，腹侧纹状体的活动与体重指数（BMI）呈正相关。这些发现表明，应该通过第三人称（视频）图像来推广不健康食品，以削弱与模拟消费相关的奖励，特别是在超重人群中。然而，似乎通过这种方式改变视觉视角并不能增强对健康食品的感知。因此，它们的推广需要补充解决方案。
