Time-limited desensitisation, implosion and shaping for phobic patients: A crossover study

A comparison was made of the short-term time-limited efficacy of three forms of behaviour therapy in phobic patients: Systematic Desensitization (in imagination), Implosion (in imagination) and Shaping, or Reinforced Practice. A block design was used, all patients receiving all treatments in randomised order. Improvement was measured behaviourally and by symptom rating scales. Differences emerged only on the behavioural measures: Shaping was significantly superior to Desensitisation, with Implosion between the two, and not significantly different from either. Comparison of treated with untreated phobias within subjects showed Shaping to be more specific than the other two forms of treatment. It was concluded that Implosion and Shaping are potentially useful types of therapy, worthy of further study and application.