Fig. 2

Trajectory variability in the two stroke and two control groups. A An example trajectory plot of the contralesional arm from one representative participant of each group. B Trajectory variability of the contralesional hand during unilateral conditions on the group level. Both LHS and RHS patients showed higher trajectory variability compared to their control groups. C Trajectory variability of the ipsilesional hand during unilateral conditions. Stroke patients showed higher trajectory variability compared to their control groups, but no pairwise comparisons survived the correction of multiple comparisons. Translucent points: individual mean data. D Performance of the contralesional hand. Generally, patients showed higher trajectory variability compared to the control groups. Specifically, RHS patients displayed stronger impairment during anti-phase movements, while LHS patients had more impairments during in-phase movements. E Performance of the ipsilesional hand. Stroke patients showed higher trajectory variability compare to the control groups, but no significant interaction with the lesion side. No pairwise comparisons survived the statistical threshold after corrected for multiple comparisons. Translucent points: individual mean data. LHC left hemispheric control, LHS left hemispheric stroke, RHC right hemispheric control, RHS right hemispheric stroke. *p < 0.05 compared to the control group (after corrected for multiple comparisons). Column and error bar = mean ± se