Figure 1.

Schematic of the experimental design for the one‐back tasks for pictures of objects (P), written words corresponding to objects (W), and interleaved pictures and words (MIXED). Each image was presented for 100 msec with an interstimulus interval of 1,200 msec. At the beginning of each new block, a pre‐set color stimulus warned the subject that a new comparison would be required: two red circles for W, two blue rectangles for P, and a blue rectangle together with a red circle for MIXED.