Fig. 4

Representational dissimilarity matrices of the affected and unaffected limbs. Results are for the same participants as shown in Fig. 2 (separated by column), ages 8, 10, and 20, respectively. The top row (A, B and C) shows the results for the affected limb, and the bottom row (D, E and F) shows the results for the unaffected limb. In each panel the diagonal represents the similarity of the average muscle state for each limb movement to itself. The off-diagonals represent the pairwise similarity between each pair of average muscle states. As expected, wrist movements are very dissimilar from hand movements (lighter shading). Additionally, power and key showed low dissimilarity in the unaffected limb. Surprisingly, participant A showed low dissimilarity between point and key in their unaffected limb (darker shading). Post-hoc viewing of video recordings revealed unique thumb placement during point (palmar adduction) which resulted in a hand position more similar to key than other participants