Inclusion Criteria:  Male or female Aged 9 to 11 or 18 to 40 Affiliated to a health care organism Signed written informed consent (adult subjects) One of the legal guardians of children subjects providing their free, informed and written consent to participate in the study; With the child also giving orally his consent to participate.  For participants with Developmental coordination disorder:  Subjects fulfilling the diagnostic criteria for dyspraxia of DSM-5 (these criteria will be verified by the principal investigator) Total MABC-2 score below the 15th percentile (if this MABC-2 assessment is already available).  Exclusion Criteria:  Prematurity Known neurological pathology (other than dyspraxia) Intellectual disability Visual impairment Surgery or trauma to the upper limbs that has occurred too recently to allow proper testing Subject under tutorship or curatorship Subject deprived of liberty by a judicial or administrative decision  For healthy volunteers only:  - History of developmental coordination disorder in close relatives (parents, children, siblings).