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Chunk #20 — 2. Material and Methods — 2.2. Stimuli and procedure

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Current source density (CSD) old/new effects during recognition memory for words and faces in schizophrenia and in healthy adults.
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For each block, the item sequence consisted of 34 items that repeated once after either a short or a long lag (8 or 24 intervening items; n = 17 each; pseudo-randomized order), and 46 filler items that did not repeat. Items that were to be repeated were considered new items at the first presentation, and old items at the second presentation, and these repeated items formed the basis for the subsequent data analysis to compare “true” memory effects that are largely independent of the physical and connotational differences between stimuli. In contrast, never-repeated words or faces were considered filler items and not included in the data analysis.