Fig. 1.

Experiment design. Top: each trial consisted of a quartet of object pictures, with a 100-ms fixation cross between pictures and a 1,700-ms fixation cross after each quartet (pictures were presented in color). Bottom: after its first presentation, each unique quartet of pictures was either immediately repeated (Weak Repeat) or presented in rearranged order (Weak Violation). Weak Repeat quartets were later (∼10 min) repeated a third time, immediately followed by a fourth repetition (Strong Repeat) or rearranged version (Strong Violation). TRs, repetition times.