Words matter: age-related positivity in episodic memory for abstract but not concrete words.

Research continues to assess potential boundary conditions for the age-related positivity effect in emotional information processing. Beyond the valence and arousal characteristics of a stimulus, other features may play a role in the manifestation of positivity effects. Differences between abstract and concrete words (i.e., the level of imageability, presence of affective content) may lead to differences in downstream processing outcomes. The present study examined whether additional features of word stimuli, beyond valence and arousal, could influence the emergence of age-related positivity in episodic memory. Fifty-two younger adults and 51 older adults completed a categorization task where they separated a series of positive, negative, and neutral words into "abstract" or "concrete" categories. A surprise recognition task followed after a short delay. Results revealed a three-way Age × Valence × Word Type interaction. No age differences in overall recognition was observed for concrete words, regardless of emotion; however, for abstract words, an Age × Valence interaction emerged whereby older adults recognized more positive than negative words, while valence differences were less pronounced among younger adults. Concrete words were remembered better than abstract words by both age groups, regardless of valence. Conversely, preferential processing appeared to occur for positive abstract words, especially for older adults. We contend that these results provide further evidence of the top-down and controlled nature of age-related positivity effects in episodic memory.