Research has suggested that a reward deficiency syndrome may contribute to

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Reward deficiency syndrome is a theory suggesting that individuals with certain genetic or environmental risk factors may have a reduced reward response in the brain, leading to a susceptibility to addiction or other impulsive behaviors. Several studies have linked this syndrome to alcohol dependence, among other substance use disorders. The other options (insomnia, schizophrenia, Parkinson's disease) have not been strongly linked to reward deficiency syndrome.

Research Has Suggested That a Reward Deficiency Syndrome May Contribute