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Psychiatrists have discovered the "craving centre" of the brain which causes smokers, drinkers, gamblers and drug users to relapse into addiction, it was claimed today.
A small pea-shaped area in the frontal lobe of the brain, called the anterior cingulate cortex, is responsible for long-term cravings which remain with addicts even when they have kicked their habit. It stores up memories of feelings of excitement and pleasure associated with the substance, and triggers those emotions when individuals have the opportunity to take their drug of choice.
Professor David Nutt, from the University of Bristol, said experiments with alcoholics showed that "cue exposure" to alcohol, such as showing them a bottle of their favourite drink, activated this area of the brain when the addicts had brain scans. Previous research has shown that the anterior cingulate cortex is also linked to other cravings, such as food, gambling and sex.
Speaking at the annual meeting of the Royal College of Psychiatrists in Harrogate, Prof Nutt said: "The anterior cingulate cortex is a primitive brain region which is involved in strong interests.
"If you show people sex videos it lights up in brain scans too. The cue to craving will always be there in addicts - and it gets stronger with time. Once you've acquired an addiction, the memory is always there."
However, another part of the brain, the orbital frontal cortex, determines whether or not people act on these cravings.
"The addiction is there and you either strengthen the addict's cortical ability to inhibit the cravings or you use drugs to dampen it down.
"The anterior cingulate cortex is a a primitive part of the brain and the higher frontal cortex is controlling that," he explained to delegates.
Addicts can be treated with drugs, such as acamprosate or naltrexone, or psychosocial therapies such as cognitive behavioural therapy, he said.
Dr Jonathan Chick, a psychiatrist at the University of Edinburgh, said psychosocial therapies and step programmes, such as the one advocated by Alcoholics Anonymous, were as effective as drug therapies and much cheaper.
Professor Colin Drummond, head of the addiction unit at St George's Hospital, London, said there were two distinct forms of craving: the acute feelings of craving, when someone is withdrawing from a substance, and the latent cravings triggered by memories and activated by the anterior cingulate cortex.
This explains why many "clean" addicts relapse when they come out of addiction units. "When they come out hospital they get a shock because that latent reaction cues are still there," he said.
"As a former smoker, being in the presence of your old smoking buddies is a cue and it triggers off craving, even if there is no nicotine in your body.
"It's a conditioned response. This knowledge isn't new - but the research to show exactly what's going on in the brain is."
Professor Drummond's research at St George's shows that if addicts are repeatedly exposed to their favourite drink, the cravings lessen. "It's the same method used to treat people with phobias," he explained.
"If you expose phobics to the thing they fear, like spiders, they slowly get better, and it's the same with alcoholics.
"But it has to be a gradual exposure - smelling drink, holding a glass etc. If you go and deliberately seek out bars or smokers you increase your risk of relapse."
