Figure 4.

The variation in d′ for the first three experiments, in which the effect of viewing sequences of morphed face pairs on later discrimination performance was measured. (A) Discrimination performance in experiment I separated into stimuli chosen from WG that had been morphed and those from BG that had not. Note the more rapid rise in d′ for BG trials. (B) The same analysis for experiment II. Note BG and WG performance levels are indistinguishable. (C) The same analysis for experiment III. Note BG and WG performance levels are once again indistinguishable.