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Some hypotheses have been presented on the possible role of the Congenital Activity Type in personality development. These have been based on clinical observations of many cases in psychoanalytic treatment and direct observations of some two hundred newborn infants.
Bearing in mind the difficulty of obtaining sufficient evidence for these hypotheses at the present time, we have nevertheless explored the role of the Congenital Activity Type in (1) the parent-child relationship; (2) psychosexual development; (3) ego development; (4) defense mechanisms; and (5) predisposition to pathology.