Hyperactivity of the impulsive system or in the amygdala may contribute to giving in to impulses. This hyperactivity would exaggerate the rewards of the stimulus and make people favor giving in to short term, immediate affects over long term ones.  

Grand Valley State University

The amygdala is key for triggering somatic states. It connects the stimulus to it's affective and emotional attributes. The responses induced by the amygdala are short lived. The emotional and affective response is done through the hypothalamus. 

Role of the Amygdala

Xiao, L., Dube, L., & Bechara, A., (2010). Resisting Temptation: Impulse Control and Trade-offs between immediate Rewards and Long-Term Consequences. In Laurette Dubé, Antoine Bechara, Alain Dagher, Adam Drewnowski, Jordan Lebel, Philip James, Rickey Y. Yada (Eds.), Obesity Prevention (pp. 105-114). Academic Press. https://doi.org/10.1016/B978-0-12-374387-9.00008-8

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