A statewide sample of WWII ex‐POWs (N = 442) responded to questionnaires that sampled current and past difficulties with PTSD‐related symptoms; an incidence of serious difficulties with these symptoms of 56% was revealed. Retrospective reports of temporal patterns revealed no consistent patterns of symptom occurrence, but, rather, a waxing and waning of difficulties over the 40‐year period. Unexpectedly, measures of severity of the POW experiences did not predict current symptomatology. Rank at time of capture, however, was consistently and strongly predictive of PTSD. It is suggested that PTSD is a highly persistent phenomenon and that both situation and person variables contribute to the development and maintenance of PTSD.

Is THE STREAM OF BEHAVIOR seen as a continuum or as a sequence of discrete units? If the latter, do different people see the same units? People behave toward others, and they speak and write about their own and other's behavior as if they perceive behavior in units; and the degree of harmony with which interacting individuals guide their behavior suggests considerable agreement regarding the beginning and end-points of the behavior units they discern. The research reported in this chapter provides the first precise and systematic information about these important matters. In addition to his empirical findings, Dr. Dickman presents his thinking about the grounds people use in dividing the behavior stream and about the sources of their agreements and disagreements.

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