Figure 1.

Experimental paradigm. (A) The force transducer was held with the right hand between the thumb and fingers and rested comfortably along the side of the body inside the scanner. (B) During the 30 s rest block, the visual display consisted of a high contrast black background with white target bar corresponding to 15% MVC and a stationary red colour bar. The transition of the colour bar to green cued participants to produce and maintain 15% MVC for 30 s and provided online visual feedback. (C) A 1-N difference between the colour and target bar was represented by a small spatial displacement and visual angle in the low feedback task and (D) a large spatial displacement and visual angle in the high feedback task. (E) An exemplar force trace for a single control participant during the high (black) and low feedback (grey) tasks showing force fluctuations around 15% MVC.