This is an important point. Its easier to resist a cookie that's out of sight in a cupboard than it is to resist a cookie that's sitting right in front of you.

This is an important point. Its easier to resist a cookie that's out of sight in a cupboard than it is to resist a cookie that's sitting right in front of you. Impulsivity comes from an emotional response within the deeper parts of the brain. The prefrontal cortex needs more time and willpower to really consider an impulse.