Among the many definitions of addiction, there is yet another that defines it from a biochemical perspective. Professor of Psychology and author Harry B. Milkman defines addiction as " self-induced changes in neurotransmission that result in social problem behaviors." This definition touches on the psychological, biochemical and social aspects of addictive processes. “It is not limited specifically to substance...
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...y Information, “Clinical and laboratory observations have converged on the hypothesis that addiction represents the pathological usurpation of neural processes that normally serve reward-related learning.” The major substrates of persistent compulsive drug use are hypothesized to be molecular and cellular mechanisms that underlie long-term associative memories in several forebrain circuits (involving the ventral and dorsal striatum and prefrontal cortex) that receive input from midbrain dopamine neurons.
Addiction is a disease that may affect the psychology of the brain but that is due to the chemical effects of the drug abuse on the human body. Though in my opinion, it seems you cannot have one without the other, since the assignment was to chose one side over the other I would say that the cause of addiction is mostly physiological as opposed to psychological.
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