Zhou Yizhou, Liu Yong, Du Jie, Chen Hong
Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, Chongqing, China; School of Psychology, Southwest University, Chongqing, China.
Department of Communication Science, VU University Amsterdam, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands.
Neurosci Lett. 2018 Apr 13;672:130-135. doi: 10.1016/j.neulet.2018.02.048. Epub 2018 Mar 21.
Restrained eaters are likely to overeat when pre-exposed to cues such as the sight, smell, thought or taste of palatable food whereas unrestrained eaters remain unaffected. However, the neurocognitive correlates of inhibitory control to food stimuli after food exposure have not been examined. This study examined food-related and food-unrelated inhibitory control with two variants of Go/No-go task by means of event-related potentials (ERPs) before and after food exposure among restrained and unrestrained eaters. Results revealed that there was a reduction of food-related no-go N2a neural response strength in frontal/frontal-central among restrained eaters compared to unrestrained eaters. Meanwhile, for restrained eaters, food-related no-go P3 amplitude increased significantly after exposure in comparison with baseline, but for unrestrained eaters there was no difference. Importantly, the exposure-induced difference in inhibition between restrained and unrestrained eaters was specific for food-related responses. Results indicated that restrained eaters may be less efficient in monitoring conflict over food-related stimuli and require more cognitive resources to inhibit food-specific responses when exposed to cues of attractive food.
与饮食无节制者不同，饮食节制者在预先接触美味食物的视觉、嗅觉、想法或味道等线索时，很可能会暴饮暴食。然而，食物暴露后对食物刺激的抑制控制的神经认知关联尚未得到研究。本研究通过事件相关电位（ERP），在食物暴露前后，运用两种不同形式的“停止信号任务”，对饮食节制者和饮食无节制者的食物相关及非食物相关抑制控制进行了研究。结果显示，与饮食无节制者相比，饮食节制者在额叶/额中央区域食物相关的停止信号N2a神经反应强度有所降低。同时，对于饮食节制者而言，食物暴露后与食物相关的停止信号P3波幅相较于基线显著增加，但饮食无节制者则无差异。重要的是，饮食节制者与饮食无节制者在暴露后抑制方面的差异，特定于食物相关反应。结果表明，饮食节制者在监测与食物相关刺激的冲突时效率可能较低，并且在接触诱人食物线索时，需要更多认知资源来抑制食物特异性反应。
