Our large prefrontal cortex is what separates us from other animals. Pretty much all other animals live their lives by impulse and routine, but we humans have the capability to overcome that through willful action. In this case, “willful” means we consciously and deliberately “put on the brakes” to stop acting out a habit. Willful actions are enacted by the prefrontal cortex, and inhibiting impulses requires proper serotonin function in the prefrontal cortex. Unfortunately, you don’t have an unlimited supply of serotonin. Each time you inhibit an impulse, it makes it harder to inhibit other
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