Faculty of Psychology, Southwest University, Chongqing 400715, China.
Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, Chongqing 400715, China.
Int J Environ Res Public Health. 2023 Jun 14;20(12):6122. doi: 10.3390/ijerph20126122.
Research has confirmed that people with obesity exhibit special responses to food stimuli when it comes to food-related decision tasks. However, it is unclear whether the phenomenon exists in people who feel mentally obese, even though they are not obese. The aim of this study was to investigate the behavioral and neural correlations of food-related decision-making between young adults with negative body image at fatness subscale and a control group, so as to explore the differences in executive functioning between them. We used a time-delayed discounting task (DDT) and recruited 13 young female adults in each group to participate in the electroencephalogram (EEG) experiment. The number of selections for low immediate rewards and high delayed rewards was used as a performance indicator for DDT. Behavioral results showed a significant interaction effect between selection types and groups, where more delayed rewards and shorter immediate rewards were selected in the group with negative body image at fatness subscale than in the control group. Statistical correlations between body mass index (BMI) and selection times were found in the control group, but this phenomenon did not occur in the experimental group. The event-related potentials found that the P100 of young adults with a negative body image at fatness subscale was greater than those in the control group. P200 showed a significant interaction effect between groups, electrodes, and selection types. N200 and N450 in delayed rewards were more negative than in immediate rewards for both groups. These findings suggest that young adults with negative body image at fatness subscale are more restrained than young adults in the control group when choosing chocolates. Moreover, individuals with negative body image at fatness subscale might be more sensitive to food stimuli than individuals in the control group, because their P100 amplitude was significantly larger than that of individuals in the control group when exposed to food-related stimuli.
研究已经证实，肥胖人群在进行与食物相关的决策任务时，对食物刺激会表现出特殊的反应。然而，目前尚不清楚是否存在这种现象，即那些感觉自己精神上肥胖的人（尽管他们并不肥胖）。本研究旨在调查具有消极身体意象的肥胖亚量表的年轻成年人与对照组之间的食物相关决策的行为和神经相关性，以探讨他们之间执行功能的差异。我们使用了延迟折扣任务（DDT），并招募了每组 13 名年轻女性成年人参加脑电图（EEG）实验。选择低即时奖励和高延迟奖励的次数被用作 DDT 的表现指标。行为结果显示，选择类型和组别之间存在显著的交互效应，即具有消极身体意象的肥胖亚量表组比对照组选择更多的延迟奖励和更短的即时奖励。在对照组中发现体重指数（BMI）与选择时间之间存在统计相关性，但在实验组中没有发现这种现象。事件相关电位发现，具有消极身体意象的肥胖亚量表的年轻成年人的 P100 大于对照组的 P100。P200 显示出组间、电极间和选择类型间的显著交互效应。两组的延迟奖励 N200 和 N450 比即时奖励更负。这些发现表明，与对照组的年轻成年人相比，具有消极身体意象的肥胖亚量表的年轻成年人在选择巧克力时更为克制。此外，与对照组的个体相比，具有消极身体意象的肥胖亚量表的个体对食物刺激可能更敏感，因为当他们接触到与食物相关的刺激时，他们的 P100 幅度明显大于对照组的个体。
