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(A) Dependence of the duration of stimulus-locked 4- to 8-Hz theta on memory set size is indicated by the vertical shaded areas for in-set and out-of-set trials. The system noise is shown by the horizontal shaded area. (B) Bar graphs show the duration of theta in right hippocampus after the probe stimulus for in-set and out-of-set trials. The mean reaction time as a function of memory set size is indicated by the dashed lines.
