Figure 8.

Interference effects measured as differences in RT for individual responses in repeated and random serial reaction time sequences. Positive scores indicate longer RTs for random sequences (beneficial effects of repetition). Results are reported for the transition from the fifth session with sequence A to the second random session (A5/R2), the 10th session with sequence A to the third random session (A10/R3), the fifth session with sequence B to the fourth random session (B5/R4), and the average of these three transitions. Error bars represent SEM. For the average scores, significant interference effects (absolute differences >0, two-tailed t test) are indicated by *p < 0.05 or **p < 0.01.