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Behavioral performance. A, Mean proportion of studied (old) and unstudied (new) items endorsed at each confidence level for the old/new decision in which 1 is “sure new” and 6 is “sure old”. B, Source memory accuracy increased with increasing confidence in the source memory decision (3 or 4 indicates low, 2 or 5 indicates medium, and 1 or 6 indicates high). C, Source memory accuracy also increased with increasing confidence in the old/new decision. Brackets show ±SEM.
