RDS results from a dysfunction in the ‘brain reward cascade,’ a complex interaction among brain neurotransmitters in reward centers of the brain, which directly links abnormal craving behavior with a defect in at least the DRD2 dopamine receptor gene.
Blum’s foundational mechanistic statement: RDS is defined by a genetically anchored failure of the brain reward cascade, producing abnormal craving through DRD2 receptor insufficiency.
, Attention-deficit-hyperactivity disorder and reward deficiency syndrome, 2008thesis