The document discusses how when addictive substances or behaviors are removed, the brain seeks alternatives to manage feelings and bodily states. When deprived of their addiction, the brain experiences a "cortical defensive bypass" that leaves people vulnerable to giving in to their addiction or finding a replacement. Recovery behaviors help reduce this fight or flight response to triggers in order to think through consequences rather than act impulsively. The document also mentions mechanisms of alpha and theta brain waves related to calm and reactive sensory input.