In chapter IV, the authors focused on their findings on the developmental course of deprivation-specific psychological patterns (DSPs). The authors rediscussed the syndrome concept in the light of two main considerations. First, the findings indicated substantial overlap among the four postulated DSPs at 15 years including CI and I/O before requiring cooccurrence with Q-A or DA. Second, they realized that, ordinarily, syndromes are defined on the basis of a unifying pathophysiology rather than a mere clustering together of symptoms. Although they have not identified the nature of such pathophysiology, the strong continuing association with institutional deprivation extending up to at least 6 months of age, plus the findings from the pilot brain imaging study points to the likelihood that there is a unifying pathophysiology. Accordingly, they conclude that, on balance, a coherent syndrome remains a strong possibility. (Contains 6 tables.)