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opponent process theory
suggests that behavior manifests as the result of two processes
these two processes can be either positive or negative in value, but are always opposites (A and B process)
early in addiction
driven by desire for positive effects
impulsive drug seeking
driven by reward system
late in addiction
driven by desire to relieve withdrawal symptoms
compulsive drug seeking
driven by anti-reward system
homeostasis
the tendency of the body to seek a stable equilibrium