The ability to predict sensory effects of people's own motor actions is a key component of Human action realization. Recent studies revealed this anticipation process to be involved in early and late stages of voluntary actions. Nevertheless, the question whether the action-effect anticipation is impacted or not by "motor pathologies", such as the Parkinson's disease, remains unclear. The current study is aimed to clarify this issue by using a subliminal priming paradigm in patients with Parkinson's disease and in matched control participants. Indeed, subliminal primes corresponding to visual action-effects are displayed at different time points before the actions' execution. Results should allow to determine whether or not the action-effect prediction is impaired at different stages of voluntary action in patients with Parkinson's disease.

Inclusion Criteria:

• Adults age 18 years and older
• Parkinson's disease

Exclusion Criteria:

• Other pathology or neurological or psychiatric history
• Known pregnancy or breastfeeding
• Absence of affiliation to social security or universal health coverage (CMU)
• Person under legal protection
• Patient's opposition to participate

patients with Parkinson's disease, according to the MDS-UPDRS III (Movement Disorder Society-sponsored revision of the Unified Parkinson's Disease Rating Scale), matched for gender and for age with healthy subjects from a database.

This database has already been constituted by the CNRS (Centre national de la recherche scientifique, Laboratory of Psychology of Perception - UMR8242).