Abstract
It has been hypothesized that a salient feature of the aging process is a decline in the ability to inhibit intrusive irrelevant information. Examination of distractor interference and negative priming effects in a group of older adults confirmed this hypothesis: Distracting information in terfered with performance more in older subjects, and this population produced less evidence for inhibitory mechanisms when compared with younger adults. It is suggested that inhibition may be a general mechanism that is particularly vulnerable in a variety of clinical populations, and it may provide a marker for early detection of syndromes characterized by breakdown in cogni tive processes. Selectivity in perception and action is crucial for suc cessful goal-directed hehavior. Complex environments containing numerous objects that afford an enormous range of actions are ubiquitous. Therefore, the inhibiting of inappropriate thoughts and actions is an extremely im portant mechanism. Recent research has revealed individual differences in the ability to inhibit the processing of to-he-ignored ob
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