Figure 4: Across sessions, there was an increase in power for the conceptually manipulated action, relative to the conceptually unfamiliar action, for time segments 3–5 (*p < 0.05).

The photographs beneath the time segments depict example still frames of the event that defined each period. The goal-item toward which the actor moved with the tool became clear between time segments 3 and 4. The time segments were matched in duration across all trials.