75 ALTERED VISUOMOTOR PROCESSING IN NA 4 Figure 2 Behavioural results A. Reaction time graphs for left and right hands. As indicated by the asterisks, a 3-factor (GROUP x LATERALITY x BIOMECHANICAL COMPLEXITY) mixed ANOVA revealed a main effect of GROUP (F(1, 60) = 6.79, p < 0.0125, part. η2 = 0.10). The x-axes of both A. and D. show the different rotations, collapsed over view (dorsal, palmar), with either a medial/easy or lateral/complex orientation. B. Biomechanical complexity effect Box plot showing the difference in reaction time between stimuli associated with biomechanically complex and biomechanically easy movement. Positive difference scores indicate significantly slower responses for complex versus easy biomechanical complexities (significant main effect of BIOMECHANICAL COMPLEXITY: F(1, 60) = 104.60, p < 0.001, part. η2 = 0.64 in the 3-way mixed ANOVA of GROUP x LATERALITY x BIOMECHANICAL COMPLEXITY). C. Posture effect Box plot showing the difference in reaction time between stimuli with a view incongruent versus congruent with participants’ own limb position. Positive difference scores indicate significantly slower responses for incongruent than for congruent postures (significant main effect of POSTURE: F(1, 60) = 25.15, p < 0.001, part. η2 = 0.30 in the 3-way mixed ANOVA of GROUP x LATERALITY x BIOMECHANICAL COMPLEXITY). In B. and C. boxes represent the interquartile range (IQR) (from the 25th (Q1) to the 75th (Q3) percentile); whiskers show the minimum within Q1-1.5*IQR and the maximum within Q3+1.5*IQR; circles are outliers that lie outside Q1/3-/+ 1.5*IQR D. Error rate graphs showing raw error rate in percentage for left and right hands. As indicated by ns, a 3-factor (GROUP x LATERALITY x BIOMECHANICAL COMPLEXITY) mixed ANOVA revealed that there were no significant group differences in ER (F(1, 60) = 0.33, p = 0.57, part. η2 = 0.01). NA = neuralgic amyotrophy; HP = healthy participant; RT = reaction time; ns = not significant; D = delta; ms = milliseconds; * significant difference at p < 0.0125

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