Figure 1 Interaction between intellectual enrichment and brain atrophy on learning and memory

Intellectual enrichment moderates the effect of brain atrophy on (A) verbal learning and (B) verbal memory. The dashed line represents subjects with vocabulary knowledge at the 25th percentile of our sample, which corresponds to approximately the 38th percentile of the WASI normative sample (T = 47). The solid line represents subjects with vocabulary knowledge at the 75th percentile of our sample, which corresponds to approximately the 86th percentile of the WASI normative sample (T = 61). TVW = third ventricle width; WASI = Wechsler Abbreviated Scale of Intelligence.