BACKGROUND Changes of resting brain activities after visual food stimulation might affect the feeling of pleasure in eating food in daily life and spontaneous appetitive motives. We used magnetoencephalography (MEG) to identify brain areas related to the activity changes. METHODS Fifteen healthy, right-handed males [age, 25.4 ± 5.5 years; body mass index, 22.5 ± 2.7 kg/m2 (mean ± SD)] were enrolled. They were asked to watch food or mosaic pictures for 5 min and to close their eyes for 3 min before and after the picture presentation without thinking of anything. Resting brain activities were recorded during two eye-closed sessions. The feeling of pleasure in eating food in daily life and appetitive motives in the study setting were assessed by visual analogue scale (VAS) scores. RESULTS The γ-band power of resting oscillatory brain activities was decreased after the food picture presentation in the right insula [Brodmann's area (BA) 13], the left orbitofrontal cortex (OFC) (BA11), and the left frontal pole (BA10). Significant reductions of the α-band power were observed in the dorsolateral prefrontal cortex (DLPFC) (BA46). Particularly, the feeling of pleasure in eating food was positively correlated with the power decrease in the insula and negatively with that in the DLPFC. The changes in appetitive motives were associated with the power decrease in the frontal pole. CONCLUSIONS These findings suggest automatic brain mechanics whereby changes of the resting brain activity might be associated with positive feeling in dietary life and have an impact on the irresistible appetitive motives through emotional and cognitive brain functions.

中文翻译：

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视觉食物刺激改变了与食欲动机有关的静止的振荡性脑活动。

背景技术视觉食物刺激后休息的大脑活动的变化可能影响日常生活中进食食物的愉悦感和自发的食欲动机。我们使用了脑磁图（MEG）来识别与活动变化相关的大脑区域。方法15名健康的右撇子男性[年龄，25.4±5.5岁；体重指数[22.5±2.7 kg / m2（平均±SD）]。要求他们在图片展示前后观看食物或马赛克图片5分钟，并闭上眼睛3分钟，而无需考虑任何事情。在两次闭眼期间记录了静息的大脑活动。通过视觉模拟量表（VAS）评分来评估日常生活中进食的愉悦感和研究环境中的饮食动机。结果在右岛[Brodmann区域（BA）13]，左眶额皮层（OFC）（BA11）和左额叶极（BA10）呈现食物图像后，静止的振荡性脑活动的γ波段功率降低。 。在背外侧前额叶皮层（DLPFC）（BA46）中观察到了α波段功率的显着降低。特别是，进食时的愉悦感与绝缘体的功率下降呈正相关，与DLPFC的功率下降呈负相关。食欲动机的变化与额叶的力量下降有关。