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Abstract:
Abstract: In an earlier study of false memory, using a
modified Deese-paradigm, we found differences in Event Related
Potentials (ERPs) to recognized OLD words and incorrectly
recognized LURE words for good but not for poor performers. The
present study used an item specific and a category specific
encoding task to determine if these performance related
ERP-differences depend on different encoding processes. The
Category Group made fewer false alarms to NEW words, even though
the false alarm rate to LURE words was equivalent for both groups.
There were no differences between the two groups in old/new
ERP-effects to OLD words, but importantly, brain activity
accompanying false recognition was modulated by encoding condition.
In the Category Group, early (300..500 ms) frontal and middle
latency (500..700 ms) parietal old/new ERP-effects were equivalent
for OLD and LURE words. For the Item Group, the early frontal
ERP-effect was absent and the parietal ERP-effect was reduced in
amplitude. Under the assumption that the frontal ERP-effect is
related to familiarity, whereas the parietal ERP-effect is
associated with the recollection component of recognition memory,
the results suggest that recognition judgements were based on item
specific knowledge in the Item Group and on categorical knowledge
in the Category Group.
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