Adult age differences in vocabulary acquisition

Both working memory (WM) and existing vocabulary knowledge are used when th e meaning of a new word is deciphered in context. Age-related WM deficits a nd vocabulary strengths suggest that younger. and older adults rely on thes e factors differently. Participants gave definitions for rare, novel words that appeared in short passages. There measures of each individual differen ce factor (WM and vocabulary were administered. Older adults gave more comp lete definitions for the novel words, had higher vocabulary knowledge test scores, but reduced WM scores compared to younger adults. As predicted, exi sting vocabulary knowledge contributed more to extracting word meaning from context than did WM for the older adults only.