Figure 3.

Reaction times (mean ± SEM) for the seven different responses (R1–R7) generated in each trial of the NRT for subjects classified as having developed implicit knowledge of the hidden structure (ImK) or not (NoK) at initial practice before sleep (pre-NoK vs. pre-ImK, panel A, averaged across the three task blocks) and at retesting after sleep (post-NoK vs. post-ImK, panel B, averaged across the 10 task blocks). ImK subjects show faster reaction times than NoK subjects particularly for responses R5–R7 that are determined due to the mirror structure (as shown in Fig. 1A) in relation to the undetermined responses R2–R4. Reaction times for R5 are in all subjects distinctly shorter than for all other responses because it is always a direct repetition of R4. For details, see Materials and Methods.