Fregni Felipe, Orsati Fernanda, Pedrosa Waldelle, Fecteau Shirley, Tome Fatima A M, Nitsche Michael A, Mecca Tatiana, Macedo Elizeu C, Pascual-Leone Alvaro, Boggio Paulo S
Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Avenue #KS 454, Boston, MA, 02215, USA.
Appetite. 2008 Jul;51(1):34-41. doi: 10.1016/j.appet.2007.09.016. Epub 2007 Dec 23.
We aimed to assess whether modulation of the dorsolateral prefrontal cortex (DLFPC) with noninvasive brain stimulation, namely transcranial direct current stimulation (tDCS), modifies food craving in healthy subjects. We performed a randomized sham-controlled cross-over study in which 23 subjects received sham and active tDCS (anode left/cathode right and anode right/cathode left) of the DLPFC. Subjects were exposed to food and also watched a movie of food associated with strong craving. Desire for food consumption was evaluated by visual analogue scales (VAS) and food consumption before and after treatment. In addition we measured visual attention to food using an eye tracking system. Craving for viewed foods as indexed by VAS was reduced by anode right/cathode left tDCS. After sham stimulation, exposure to real food or food-related movie increased craving; whereas after anode left/cathode right tDCS, the food-related stimuli did not increase craving levels, as revealed by the VAS scale. Moreover, compared with sham stimulation, subjects fixated food-related pictures less frequently after anode right/cathode left tDCS and consumed less food after both active stimulation conditions. These changes were not related to mood changes after any type of tDCS treatment. The effects of tDCS on food craving might be related to a modulation of neural circuits associated with reward and decision-making.
我们旨在评估采用非侵入性脑刺激,即经颅直流电刺激(tDCS)调节背外侧前额叶皮质(DLFPC)是否会改变健康受试者的食物渴望。我们进行了一项随机假刺激对照交叉研究,其中23名受试者接受了DLPFC的假刺激和主动tDCS(阳极在左/阴极在右以及阳极在右/阴极在左)。受试者接触食物,并观看与强烈渴望相关的食物影片。通过视觉模拟量表(VAS)以及治疗前后的食物摄入量来评估对食物消费的渴望。此外,我们使用眼动追踪系统测量对食物的视觉注意力。阳极在右/阴极在左的tDCS降低了VAS所指数的对所观看食物的渴望。在假刺激后,接触真实食物或与食物相关的影片会增加渴望;而在阳极在左/阴极在右的tDCS后,如VAS量表所示,与食物相关的刺激并未增加渴望水平。此外,与假刺激相比,在阳极在右/阴极在左的tDCS后,受试者较少频繁注视与食物相关的图片,并且在两种主动刺激条件下食物摄入量均减少。这些变化与任何类型的tDCS治疗后的情绪变化无关。tDCS对食物渴望的影响可能与对与奖励和决策相关的神经回路的调节有关。
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