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Influence of stimulus repetition on negative priming.

Potential age-related differences in the influence of stimulus repetition on negative and positive priming were investigated in a same-different picture comparison task. Forty-eight young adults and 48 old adults compared a target picture of a familiar object with a standard picture of a familiar object to determine if they were the same or different, while ignoring an overlapping distractor picture presented in a different color. Negative priming effects increased in magnitude with the repetition of the experimental stimuli in a similar fashion for both young and old adults. Conversely, positive priming effects decreased in magnitude with increases in stimulus repetition for both young and old adults. These data suggest that identity-based inhibition develops in a similar fashion from young adulthood to old age. Furthermore, these data add to the growing body of studies that suggest age invariance in the ability to inhibit task-irrelevant information in the environment on the basis of stimulus identity.