Age-Related Differences in Implicit Learning of Non-Spatial Sequential Patterns

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Abstract
This experiment investigated whether there are age differences in implicit learning of non-spatially arranged sequential patterns. We tested 12 young and 12 old participants for five sessions each in a non-spatial alternating serial reaction time (ASRT) task, in which predictable pattern events alternated with random, unpredictable ones. People of both ages were able to learn the sequence, but older people showed less pattern sensitivity than younger ones. Neither group was able to exhibit declarative knowledge of the pattern or to discriminate between pattern and random sequences on a recognition test, suggesting that the learning was indeed implicit. These findings indicate that the age deficits previously observed in the learning of spatial sequences are not due solely to age-related deficits in visuo-spatial attention or control of eye movements, but rather reflect a more general deficit in the ability to learn subtle sequential regularities.

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