The effect of age on involuntary capture of attention by irrelevant sounds: A test of the frontal hypothesis of aging

The aim of this study was to examine the effects of aging on the involuntary capture of attention by irrelevant sounds (distraction) and the use of these sounds as warning cues (alertness) in an oddball paradigm. We compared the performance of older and younger participants on a well-characterized auditory-visual distraction task. Based on the dissociations observed in aging between attentional processes sustained by the anterior and posterior attentional networks, our prediction was that distraction by irrelevant novel sounds would be stronger in older adults than in young adults while both groups would be equally able to use sound as an alert to prepare for upcoming stimuli. The results confirmed both predictions: there was a larger distraction effect in the older participants, but the alert effect was equivalent in both groups. These results give support to the frontal hypothesis of aging [Raz, N. (2000). Aging of the brain and its impact on cognitive performance: integration of structural and functional finding. In F.I.M. Craik & T.A. Salthouse (Eds.) Handbook of aging and cognition (pp. 1-90). Mahwah, NJ: Erlbaum; West, R. (1996). An application of prefrontal cortex function theory to cognitive aging. Psychological Bulletin, 120, 272-292].

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