Figure 4.

Shoulder abduction increases reliance on the ipsilateral hemisphere in stroke but not controls. (A) Example of cortical activity in sensorimotor cortex in one individual with stroke during hand opening on the table (left), hand opening while lifting against 50% max shoulder abduction (middle), and the difference between the two tasks (Open + SABD50 − Open; right) normalized by the max observed activity. The right hemisphere is the lesioned hemisphere. (B) Boxplots with individual data overlaid showing laterality index (LI) for controls (left; blue) and stroke (right; red) for hand opening on the table (light) and hand opening while lifting against 50% max shoulder abduction (dark). Controls show no difference between conditions, while the addition of SABD increases reliance on the ipsilateral hemisphere in individuals with stroke (i.e., negative LI). * p < 0.05.\