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Abstract:
Abstract: We employed source-localization of dense-array ERP
recordings co-registered to structural MRI to test the hypothesis
that the encoding into memory of associated and fused pairs of
concepts relies on different brain areas. This was done using a
conceptual combination paradigm in which subjects' task was to try
to fuse a sequentially presented pair of words into a single
concept (e.g., as in a compound noun). Success or failure of fusion
for each pair was indicated by button-press. This was followed by a
memory test for temporal order of pair items in which half of the
test pairs were in the reverse order compared to the encoding
phase. The subsequent memory encoding effect for fused and
non-fused (i.e., associated) pairs in the encoding phase was
computed by performing a median split on the reaction times at
test, and by averaging encoding phase ERPs according to fast and
slow test-phase responses. Source localization of this later-fast
minus later-slow encoding effect for fused and associated pairs was
performed using a realistic head model derived from structural
MRI.
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