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Dopamine regulates the motivation to act

The widespread belief that dopamine regulates pleasure could go down in history with the latest research results on the role of this neurotransmitter. Researchers have proved that it regulates motivation, causing individuals ...

Neuroscience created Apr 29, 2013 | popularity 5 / 5 (3) | comments 2

Heroin vaccine blocks relapse in preclinical study

Scientists at The Scripps Research Institute (TSRI) have reported successful preclinical tests of a new vaccine against heroin. The vaccine targets heroin and its psychoactive breakdown products in the bloodstream, preventing ...

Medical research created May 06, 2013 | popularity 5 / 5 (3) | comments 0 | with audio podcast

Binge eating curbed by deep brain stimulation in animal model, study shows

(Medical Xpress)—Deep brain stimulation (DBS) in a precise region of the brain appears to reduce caloric intake and prompt weight loss in obese animal models, according to a new study led by researchers at the University ...

Neuroscience created Apr 24, 2013 | popularity 5 / 5 (2) | comments 0 | with audio podcast

How the brain influences our eating behaviour

Why do we overeat and consume more calories than we need? Is food our way of rewarding ourselves, and can stress make us want to eat more? These are just some of the questions a European food study aims to ...

Neuroscience created May 06, 2013 | popularity 5 / 5 (1) | comments 0

Deep brain stimulation: A fix when the drugs don't work

Neurological disorders can have a devastating impact on the lives of sufferers and their families.

Neuroscience created May 17, 2013 | popularity 5 / 5 (1) | comments 0 | with audio podcast

Addiction as a disorder of decision-making

New research shows that craving drugs such as nicotine can be visualized in specific regions of the brain that are implicated in determining the value of actions, in planning actions and in motivation. Dr. Alain Dagher, from ...

Neuroscience created May 22, 2013 | popularity 5 / 5 (1) | comments 0

Survey points out deficiencies in addictions training for medical residents

A 2012 survey of internal medicine residents at Massachusetts General Hospital (MGH) – one of the nation's leading teaching hospitals – found that more than half rated the training they had received in addiction and other ...

Other created May 22, 2013 | popularity 5 / 5 (1) | comments 0

Addiction to unhealthy foods could help explain the global obesity epidemic

Research presented today shows that high-fructose corn syrup can cause behavioural reactions in rats similar to those produced by drugs of abuse such as cocaine. These results, presented by addiction expert Francesco Leri, ...

Overweight and Obesity created May 22, 2013 | popularity 4 / 5 (1) | comments 0

Addiction

The term "addiction" is used in many contexts to describe an obsession, compulsion, or excessive psychological dependence, such as: drug addiction (e.g. alcoholism), video game addiction, crime, money, work addiction, compulsive overeating, problem gambling, computer addiction, nicotine addiction, pornography addiction, etc.

In medical terminology, an addiction is a chronic neurobiologic disorder that has genetic, psychosocial, and environmental dimensions and is characterized by one of the following: the continued use of a substance despite its detrimental effects, impaired control over the use of a drug (compulsive behavior), and preocupation with a drug's use for non-therapeutic purposes (i.e. craving the drug). Addiction is often accompanied the presence of deviant behaviors (for instance stealing money and forging prescriptions) that are used to obtain a drug.

Tolerance to a drug and physical dependence are not defining characteristics of addiction, although they typically accompany addiction to certain drugs. Tolerance is a pharmacologic phenomenon where the dose of a medication needs to be continually increase in order to maintain its desired effects. For instance, individuals with severe chronic pain taking opiate medications (like morphine) will need to continually increase the dose in order to maintain the drug's analgesic (pain-relieving) effects. Physical dependence is also a pharmacologic property and means that if a certain drug is abruptly discontinued, an individual will experience certain characteristic withdrawal signs and symptoms. Many drugs used for therapeutic purposes produce withdrawal symptoms when abruptly stopped, for instance oral steroids, certain antidepressants, benzodiazepines, and opiates.

However, common usage of the term addiction has spread to include psychological dependence. In this context, the term is used in drug addiction and substance abuse problems, but also refers to behaviors that are not generally recognized by the medical community as problems of addiction, such as compulsive overeating.

The term addiction is also sometimes applied to compulsions that are not substance-related, such as problem gambling and computer addiction. In these kinds of common usages, the term addiction is used to describe a recurring compulsion by an individual to engage in some specific activity, despite harmful consequences, as deemed by the user himself to his or her individual health, mental state or social life.

For more information about Addiction, read the full article at Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.

Related topics: brain , alcohol , nicotine