from Part I - Concepts of Addiction
Published online by Cambridge University Press: 13 July 2020
Addiction is characterized by excessive desire for a particular substance or behavioral incentive at the expense of other life rewards. Addictive desire can develop even in absence of any associated increase in pleasure, and also in absence of withdrawal. Here we review evidence that the brain mechanisms underlying desire or ‘wanting’ can operate independently from those mediating pleasure, or "liking." That is, "wanting" and "liking" are mediated by two anatomically and neurochemically distinct brain mechanisms that normally interact together to influence motivation, but can become dissociated in the transition to addiction. Pleasure "liking" is the hedonic impact of a pleasant stimulus and is causally amplified by a brain system of several functionally interactive but anatomically distributed locations referred to as "hedonic hotspots." These hedonic hotspots are localized subregions within larger brain structures, and are relatively sensitive to disruption. By contrast, "wanting" or the subconscious desire for reward or reward-related cues is much more robust, and mediated by a larger brain system. "Wanting" can be generated by dopamine enhancements as well as by opioid enhancements in several broadly defined regions throughout mesocorticolimbic circuitry. In susceptible individuals, mesolimbic circuitry can become hyperreactive or sensitized (e.g., through previous drug experience), so that "rewards" and their related cues evoke even greater dopamine release and "wanting." Sensitized "wanting" becomes harder to resist, which can spur on excessive and compulsive pursuit and relapse in addiction. Importantly, this sensitization of brain "wanting" systems need not be accompanied by an enhancement of brain "liking" (i.e., dopamine manipulations do not appear to effect pleasure). In this chapter, we also highlight possible mechanisms for how some drugs or behaviors become the specific focus of excessive but narrow pursuit, usually involving mesolimbic brain interactions with areas such as the amygdala. Further we demonstrate that behavioral addictions such as food addiction and gambling, like drug addiction, are accompanied by sensitization of mesolimbic brain "wanting" systems in the transition to addiction.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.