Piaget's egocentrism and Witkin's psychological differentiation are important constructs in theories of cognitive development. A comparison of these concepts could lead to an increased understanding of cognitive development in the older adult. In a test of Witkin's revised model of psychological differentiation, the Portable Rod and Frame Test (PRFT), Group Embedded Figures Tests (GEFT), a spatial egocentrism task, and a role-taking egocentrism task were administered to 46 older adults. Combined measures of field-dependence and egocentrism were highly related. Measures of egocentrism correlated more highly with measures of field-dependence than with each other. Results indicating that the PRFT measures a more pervasive higher-order factor than the GEFT lend support to Witkin's revised model of psychological differentiation. The significant effects due to age, education, and error-type point out the importance of examining mediating variables when attempting to validate psychological theories. (Author/NRB)