Many affect dopamineric neurones including opiates, cocaine, amphetamine, nicotine and alcohol
Addiction => Behaviour pattern of drug use. An overwhelming involvement with high tendency to relapse.
Physical dependence => Reduced drug action (tolerance) and cessation of drug taking leads to physiological disturbances (withdrawal)
Psychological dependence => Produces pleasurable state which motivates further use through negative reinforcement
Tolerance => downregulation caused by desensitisation of receptors or decreased dendritic branching as well as pavlovian conditioning and instrumental behaviour e.g. habituation
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