Q.Discuss the various techniques used in behaviour therapy.
Behaviour therapy applies learning principles to reduce arousal and correct faulty behaviour; its main techniques are antecedent/consequent operations, negative reinforcement and aversive conditioning, positive reinforcement and token economy, differential reinforcement, systematic desensitisation, and modelling.
Aim of the techniques
Behaviour therapy postulates that distress arises from faulty behaviour or thought patterns. The principles of its techniques are to reduce the arousal level of the client, alter behaviour through classical or operant conditioning with different contingencies of reinforcement, and to use vicarious learning where necessary.
The main techniques
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Antecedent and consequent operations. The therapist establishes antecedent operations (controlling behaviour by changing something that precedes it) and consequent operations (controlling behaviour by changing its consequences). Changing the reinforcing value of a consequence is an establishing operation — e.g., reducing food at tea time (antecedent) increases hunger, and praising the child for eating dinner (consequent) establishes the response of eating dinner.
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Negative reinforcement. Responses that let an organism get rid of, avoid or escape painful stimuli are strengthened — e.g., learning to wear woollen clothes to avoid unpleasant cold weather.
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Aversive conditioning. Repeated association of an undesired response with an aversive consequence — e.g., an alcoholic is given a mild electric shock while asked to smell alcohol; with repeated pairings the smell of alcohol becomes aversive and the person gives up alcohol.
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Positive reinforcement. If an adaptive behaviour occurs rarely, positive reinforcement is used to increase the deficit — e.g., a mother prepares the child's favourite dish whenever the child does homework at the appointed time.
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Token economy. Persons with behavioural problems are given a token as a reward each time a wanted behaviour occurs; tokens are collected and exchanged for a reward such as an outing or a treat.
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Differential reinforcement. Unwanted behaviour is reduced and wanted behaviour increased simultaneously — either by positively reinforcing the wanted behaviour and negatively reinforcing the unwanted, or (a less painful, equally effective method) by positively reinforcing the wanted behaviour and ignoring the unwanted one. Example: a parent takes a sulking child to the cinema only when she does not cry/sulk, and ignores her when she cries.
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Systematic desensitisation. Introduced by Wolpe for treating phobias/irrational fears. A hierarchy of anxiety-provoking stimuli is prepared, from least to most provoking. The therapist relaxes the client and asks her/him to think of the least anxiety-provoking situation, stopping at the slightest tension. Over sessions the client imagines progressively more fearful situations while staying relaxed, and is systematically desensitised. It works on the principle of reciprocal inhibition — the presence of two mutually opposing forces (relaxation and anxiety) at the same time inhibits the weaker force, so relaxation overcomes anxiety.
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Modelling. The client learns to behave in a certain way by observing the behaviour of a role model or the therapist. Through vicarious learning (learning by observing others) and rewarding of small changes, the client gradually acquires the behaviour of the model.
The skill of the therapist lies in conducting an accurate behavioural analysis and building a treatment package with the appropriate techniques.
The techniques of behaviour therapy include: antecedent and consequent operations (establishing operations); negative reinforcement and aversive conditioning; positive reinforcement and the token economy; differential reinforcement (reinforce the wanted, ignore/negatively reinforce the unwanted); systematic desensitisation — Wolpe's hierarchy-plus-relaxation method based on reciprocal inhibition; and modelling through vicarious learning. The therapist selects and combines these based on an accurate behavioural analysis.
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