Figure 3.

Under-recruitment and nonselective recruitment of frontal regions in older adults are illustrated. A, Anterior left frontal regions are under-recruited in older adults as compared with younger adults during intentional memorization. B, Older adults, paradoxically, show increased activation in regions not typically associated with processing in younger adults (nonselective recruitment). In this example, young adults show selective recruitment of left posterior frontal regions during word encoding. Older adults show greater relative activation of the homologous right frontal region. Adapted from Logan et al (2002). See Cabeza (2002) and Reuter-Lorenz (2002) for additional examples.