Figure 4.

(A) Covariate-adjusted means for the PI scores on the measure of exposure performance. PI scores were obtained by subtracting subjects' Learning of B score from their Learning of A score. (B) Raw means for the RI scores on the measure of exposure performance. Error bars, +/− 1 SE. RI scores were obtained by subtracting subjects' Test of A score from their Learning of A score. Negative values on both the PI and RI measures indicate interference; positive values indicate either positive transfer or retention.