Fig. 3.

Means and standard errors of differences between movement sequences (complete repetitions minus hand alternations and hand repetitions minus hand alternations) in reaction time (A) and movement time (B), depending on current action mode (imagination or execution) and previous action mode (pure blocks/same mode, mixed blocks/same mode, or mixed blocks/other mode). Letters in the figure denote the action mode sequence (I = imagination, E = execution). The first letter refers to the previous trial, the second letter to the current trial. Positive values denote costs, negative values benefits