Voluntary acts are preceded by electrophysiological (RPs). With spontaneous acts involving no preplanning, the main negative RP shift begins at about200 ms. Control experiments, in which a skin stimulus was timed (S), helped evaluate each subject's error in reporting the clock times for awareness of any perceived event.

This article uses Marc Lewis’ work as a springboard to discuss the socio-political context of the brain disease model of addiction (BDMA). The claim that promotion of the BDMA is the only way the general public can be persuaded to withhold blame and punishment from addicts is critically examined. After a discussion of public understandings of the disease concept of addiction, it is pointed out that it is possible to develop a scientific account of addiction which is neither a disease (...) nor a moral model but which the public could understand. Evidence is reviewed to suggest that public acceptance of the disease concept is largely lip-service and that the claim the BDMA removes stigma among the public and professionals is unsupported by evidence. Further, there is good evidence that biogenetic explanations of mental/behavioural disorders in general have been counterproductive in the attempt to ally stigma. A model of addiction as a disorder of choice may attract special problems in public-facing communications and risks being misunderstood. However, ways of presenting this model to the public are suggested that may avoid such risks. Lastly, the claim that the BDMA is the only way of ensuring access to treatment and of maintaining research funding for addiction is disputed and a way in which these benefits can be retained under a disorder-of-choice model proposed. The article concludes by enthusiastically endorsing Lewis’ call for a third stage in the governing image of addiction. (shrink)

Drug use and drug addiction are severely stigmatised around the world. Marc Lewis does not frame his learning model of addiction as a choice model out of concern that to do so further encourages stigma and blame. Yet the evidence in support of a choice model is increasingly strong as well as consonant with core elements of his learning model. I offer a responsibility without blame framework that derives from reflection on forms of clinical practice that support change and recovery (...) in patients who cause harm to themselves and others. This framework can be used to interrogate our own attitudes and responses, so that we can better see how to acknowledge the truth about choice and agency in addiction, while avoiding stigma and blame, and instead maintaining care and compassion alongside a commitment to working for social justice and good. (shrink)

Lewis ascribes the stubborn persistence of addictions to habit, itself a normal process that does not imply lack of responsiveness to motivation. However, he suggests that more dynamic processes may be involved, for instance that “our recurrently focused brains inevitably self-organize.” Given hyperbolic delay discounting, a reward-seeking internal marketplace model describes two processes, also normal in themselves, that may give rise to the “deep attachment” to addictive activities that he describes: People learn to interpret current choices as test cases for (...) how they can expect to choose in the future, thus recruiting additional incentive against a universal tendency to temporarily prefer smaller, sooner to larger, later rewards. However, when this incentive is not enough, the same interpretation creates incentive to abandon the failed area, leading to the abstinence violation effect and a localized weak will. Normal human value does not come entirely, or even mainly, from expectation of external rewards, but is generated endogenously in imagination. Hyperbolic discounting provides an account of how we learn to cultivate the hedonic importance of occasions for endogenous reward by building appetite. In this account, expectations of the far future have to be rewarded endogenously if they are be as important as currently rewarded alternatives; and this importance is prone to collapse. Both will and hedonic importance are recursive and thus hard to study by controlled experiment, but do represent modelable, reward-based hypotheses about the dynamic nature of habit. (shrink)