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In this review, we discuss clinical and pathophysiological aspects of several motor phenomena including mirror movements, dystonic overflow, synkinesia, entrainment and mirror dystonia, focusing on their similarities and differences. These phenomena share some common clinical and pathophysiological features, which often leads to confusion in their definition. However, they differ in several aspects, such as the body part showing the undesired movement, the type of this movement (identical or not to the intentional movement), the underlying neurological condition, and the role of primary motor areas, descending pathways and inhibitory circuits involved, suggesting that these are distinct phenomena. We summarize the main features of these fascinating clinical signs aiming to improve the clinical recognition and standardize the terminology in research studies. We also suggest that the term \u201cmirror dystonia\u201d may be not appropriate to describe this peculiar phenomenon which may be closer to dystonic overflow rather than to the classical mirror movements.<\/jats:p>","DOI":"10.1002\/mdc3.13798","type":"journal-article","created":{"date-parts":[[2023,5,30]],"date-time":"2023-05-30T08:44:56Z","timestamp":1685436296000},"page":"1243-1252","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["A Reflection on Motor Overflow, Mirror Phenomena, Synkinesia and Entrainment"],"prefix":"10.1002","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2071-2083","authenticated-orcid":false,"given":"Andrea","family":"Quattrone","sequence":"first","affiliation":[{"name":"Institute of Neurology University \u201cMagna Graecia\u201d  Catanzaro Italy"},{"name":"Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7103-5209","authenticated-orcid":false,"given":"Anna","family":"Latorre","sequence":"additional","affiliation":[{"name":"Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4706-6245","authenticated-orcid":false,"given":"Francesca","family":"Magrinelli","sequence":"additional","affiliation":[{"name":"Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology University College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eoin","family":"Mulroy","sequence":"additional","affiliation":[{"name":"Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology University College London  London 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