Fig. 4

Bland-Altman plots. a and b: Total hits for S1 to S2 and S2 to S3, respectively. a shows a learning effect with a negative shift in the difference scores. c and d: Test time (s) for S1 to S2 and S2 to S3, respectively. c shows a learning effect with a positive shift in the difference scores while b and d reflect the maintenance of the learning effect one week following the initial testing session