Pre-movement planning processes in people with congenital mirror movements

Congenital mirrormovements (CMM), a disorder characterised by unintentional mirroring of motor systems on the contralateral side of voluntary movements, usually of the hands and wrists, is regarded as a rare condition of human movement (Schott and Wyke, 1981); its prevalence is unknown. CMM can be difficult to detect due to its isolated occurrence in the distal portions of the upper limbs in most individuals affected, and in particular, because there are no other known comorbidities (Franz, 2003; Franz et al., 2015).

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