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This pre-registered project is a follow-up to Drew, T., Williams, L.H., Jones, C.M. & Luria, R. (2018). Neural processing of repeated search targets depends upon stimuli: Real world stimuli engage semantic processing and recognition memory. In previous research, we found no differences in working memory representations, as indexed by the reduction in CDA amplitude with repetition, during the retention interval prior to search between artificial (Landolt Cs) and real world stimuli. However, real world objects were associated with an increased N2pc following the first presentation of the target. In addition, the morphology of non-lateralized components was markedly different between the two stimuli. Specifically, the real world stimuli elicited components associated with recognition memory and semantic processing, which were modulated by repetition of the target. These results suggest that although working memory representations are not dependent on the type of stimuli, search for real world objects benefits from associations in long term memory. In the current series of studies, we will determine how repeated search targets (6x) are supported by WM and LTM resources when they are encountered again during a later stage of the experiment.
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