Figure 6.

Additional fMRI contrasts of interest. a, Comparing trials involving an unexpected force pulse to the other conditions, small clusters of inactivation (blue) were present, though none were large enough to reach statistical significance. b, Comparing trials with and without force pulses showed no regions that were more active in response to somatosory stimuli. The absence of somatosensory stimuli increased activation in a significantly large cluster in the left superior posterior hemisphere (p < 0.001 after correction for multiple comparisons), likely resulting from the larger return movement required. Physiological covariates were included, and all images were thresholded at p < 0.01, uncorrected, with statistical significance assessed by evaluating the volume of the active cluster.