Figure 2.

Upper panels: Coefficient of variation (standard deviation/mean) of time between consecutive keypresses computed from the piano test 1 in first, second and third experimental sessions. Each symbol corresponds to a different participant. Circles correspond to controls (CTR), triangles to adolescents with CP (CPY) and stars to adults with CP (CPA). Lower coefficients of variation indicate more regular patterns of keystrokes. Lower panels: Difference in coefficient of variation between the first and second session (“1–2” in horizontal axis) and between the second and third sessions (“2–3” in x-axis). Symbols represent the median difference across group participants. A negative difference value indicates a reduction in coefficient of variation. Left panels illustrate results obtained with the best hand, and right panels illustrate results obtained with the second hand.

Abbreviations: CP, cerebral palsy; std, standard deviation.