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With reference to recent research, discuss the ways in which drugs affect human behaviour. Behaviour is a hard word to define as it has no clear beginning or end. The analysis of behaviour is specifically to describe the interaction of the organism's brain with the environment. This environment consists of the outside world and the organism's internal environment. The brain plays a major part of that internal environment and the behaviour produced becomes a part of the external environment. Behaviourism was first introduced in the early twentieth century by an American Psychologist, John Watson. He claimed that behaviour was the real subject matter for psychology as it was public, measurable, reproducible and open to scientific method. Psychologists and pharmacologists who study particular effects of drugs on behaviour often refer to their field as psychopharmacology. There have been several principles put forward to explain behavioural pharmacology, the main principle states that...

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