Objectives-This commentary assesses the degree to which the reinstatement model is homologous to the human experience of relapse.Results-A review of the literature suggests that the relationship is less clear than is often assumed, largely due to a lack of prospective data on the precipitants and process of relapse (especially relapse to heroin or cocaine abuse). However, reinstatement does not need to resemble relapse to have immediate clinical value; predictive validity as a medication screen would be sufficient. Whether the model has predictive validity is unknown, because, to date, very few clinical trials have tested medications that are effective in the reinstatement model, and even fewer have used designs comparable to those of reinstatement experiments. A clinical trial comparable to a reinstatement experiment would enroll participants who are already abstinent, and its main outcome measure would be propensity to undergo a specific type of relapse (e.g., relapse induced by stress or cues).Conclusions-Until clinical and preclinical work are more comparable, criticisms of the reinstatement model's presumed shortcomings are premature.The reinstatement model has generated a body of preclinical data that grows increasingly substantial and impressive (Shaham et al. 2003). Yet opinions remain divided about its relation to clinical realities (Marlatt 1996;Bergman and Katz 1998). In this commentary, we address the issues of whether reinstatement resembles relapse, whether it can be useful without resembling relapse, and why neither of those questions can yet be answered satisfactorily. We have drawn on clinical literature and on our own experiences working with substance abusers.
Does reinstatement resemble relapse? MaybeIn most published discussions of the reinstatement model, attention is drawn to the fact that the most widely studied precipitants of reinstatement in rats (drug priming, drug-associated cues, and stress) are provocatively similar to the precipitants of relapse in humans. This is typically taken as a point of commonality between the reinstatement model and the real-life experiences of recovered addicts. It is tempting to agree without further consideration; the assertion that priming, cues, and stress precipitate relapse is intuitively appealing and seems to accord with clinical experience. But how strong is the evidence that most relapses are precipitated by any of those three factors?No definitive answer can be found in the clinical literature. Relapse is usually described retrospectively, with weeks or months intervening between the event and its recollection. This leaves ample time for the introduction of recall bias and the formation of post hoc explanations for the reporter's behavior. As an only slightly tangential illustration of the problem, consider the intuitively plausible prediction that abused children are at increased risk for later addiction. The prediction is confirmed when adult addicts are asked retrospectively about their childhoods -but not when abused and nonabused c...