Intimations of mortality: integrative simplification as a precursor of death.

This article tested the hypothesis that a "terminal drop" in cognitive functioning occurs a few years prior to death. Letters written during the last 10 years of life were selected from the published correspondence of 18 eminent individuals and scored for integrative complexity--a variable which is related to the degree of integration and differentiation in information processing. The overall analysis supported the terminal drop hypothesis. The predicted decline in complexity was found during the five years prior to death among subjects who died of protracted illness or old age but only in the year immediately prior to death among subjects who died suddenly. There was no relation between complexity and age; the mean complexity scores of men were higher than those of women. The theoretical and practical implications of these findings are discussed.