Behavior can densensitize even a drug-free brain. Risky behaviors, pastimes, and careers (e.g. extreme sports, high-stakes finance, or professional gambling) can model the brain in powerful ways. So can intense, life-changing experiences. A brain that has been to war is not the same as a brain that has not been to war. Some people are attracted to novelty and excitement because of genetic factors that affect brain structure and neurophysiology, but behavior models our brains above and beyond the effects of genetics.
Cocaine and meth are both stimulants, but they affect the dopamine system in different ways.
Behavior can densensitize even a drug-free brain. Risky behaviors, pastimes, and careers (e.g. extreme sports, high-stakes finance, or professional gambling) can model the brain in powerful ways. So can intense, life-changing experiences. A brain that has been to war is not the same as a brain that has not been to war. Some people are attracted to novelty and excitement because of genetic factors that affect brain structure and neurophysiology, but behavior models our brains above and beyond the effects of genetics.
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