psychiatric disorders are frequently grouped and coined with a single umbrella term like anxiety. but dsm-iv indicates multiple forms with distinct psychopathologies.

"The objective of this article is to review data from studies that used a reinstatement model in rats to elucidate the neural mechanisms underlying relapse to heroin and cocaine seeking induced by exposure to the self-administered drug (drug priming), conditioned drug cues, and stressors... The main conclusion of this review is that the neuronal mechanisms involved in relapse to heroin and cocaine seeking induced by drug priming, drug cues, and stressors are to a large degree dissociable."