Accurate diagnosis within the group of depressive states is generally agreed to be difficult. Some deny the difficulty by ignoring its existence, assuming that these cases form a homogeneous continuum. But even those who share this belief-Garmany (1958) for instanceadmit discrepant results from treatment and, moreover, that there are differences in symptomatology between those -who respond, say, to E.C.T., and those who do not.
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Kiloh et al. (1962) studied this question.