This article first appeared in May 1996 in The Psychologist, Volume 9, Number 5, Pages 205–210. Permission to reproduce the article in Physiotherapy Theory and Practice has been granted by the author and the publisher of The Psychologist, the British Psychological Society. The article is based on the author' 1995 Presidents' Award Lecture at the British Psychological Society' Annual Conference held at the University of Warwick in April 1995.
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Marie Johnston (1996) studied this question.
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