Relaxation may not be necessary
The active agent in SD may be that the expectation of being able to cope with the phobic stimulus is more effective than the relaxation techniques.
Klein et al (1983) compared SD to psychotherapy for social and specific phobias and found no difference in effectiveness suggesting that relaxation is not the active element.
Symptom substitution
Phobic responses may just be symptoms of a non-phobic cause.
Freud (1909) and the case of Little Hans showed his fear of horses was not a phobia, but the projection of anxiety onto the horse. the real cause was the envy of his father, if he was treated for the horse phobia the cause would have remained.
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