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While this has been observed with the actual body, little is known about the mental representation of supernumerary body parts. Recently, it was demonstrated in HC that illusions of supernumerary fingers are not constrained by posture congruency. The current study aimed to evaluate the differences in the malleability of body representation for supernumerary body parts comparing 30 participants with AN and 30 HC using the sixth finger illusion which is a body illusion based on conflicting visual and tactile signals that lead to create the illusory perception of having an extra finger (i.e. a sixth finger). Synchronous visual\u2013tactile stroking was delivered at four abduction orientations: 0\u00b0, 90\u00b0, 135\u00b0 and 180\u00b0, plus a control condition. Participants were asked to complete an ownership questionnaire to judge the little finger\u2019s perceived orientation and the sixth finger\u2019s felt orientation when they agreed to feel six fingers. Both groups experienced the sixth finger in all orientations, despite biomechanical constraints. However, AN participants perceived the sixth finger closer to the hand\u2019s position. Previous studies in AN report higher flexibility of some body representation domains, such as embodiment and motor imagery. Interestingly, our study highlights that this higher flexibility does not seem to apply to all domains of the representation of the bodily self: AN participants showed reduced flexibility for the perceived orientation of the extra finger.<\/jats:p>","DOI":"10.1177\/17470218251390500","type":"journal-article","created":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T12:15:31Z","timestamp":1760616931000},"page":"1330-1347","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["The Sixth Finger Illusion in Anorexia Nervosa"],"prefix":"10.1177","volume":"79","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5353-7296","authenticated-orcid":false,"given":"Federico","family":"Brusa","sequence":"first","affiliation":[{"name":"Laboratorio Sperimentale di Ricerche di Neuroscienze Metaboliche e U.O. di Riabilitazione dei Disturbi Alimentari e della Nutrizione, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0511-3357","authenticated-orcid":false,"given":"Denise","family":"Cadete","sequence":"additional","affiliation":[{"name":"School of Psychological Sciences, Faculty of Science, Birkbeck, University of London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Sedda","sequence":"additional","affiliation":[{"name":"Psychology Department, School of Social Sciences, Heriot-Watt University, Edinburgh, UK"},{"name":"Centre for Applied Behavioural Sciences, School of Social Sciences, Heriot-Watt University, Edinburgh, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentina","family":"Villa","sequence":"additional","affiliation":[{"name":"Laboratorio di Psicologia Clinica, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emanuela","family":"Apicella","sequence":"additional","affiliation":[{"name":"Laboratorio Sperimentale di Ricerche di Neuroscienze Metaboliche e U.O. di Riabilitazione dei Disturbi Alimentari e della Nutrizione, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enrica","family":"Ventura","sequence":"additional","affiliation":[{"name":"Laboratorio Sperimentale di Ricerche di Neuroscienze Metaboliche e U.O. di Riabilitazione dei Disturbi Alimentari e della Nutrizione, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gianluca","family":"Castelnuovo","sequence":"additional","affiliation":[{"name":"Laboratorio di Psicologia Clinica, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"},{"name":"Dipartimento di Psicologia, Universit\u00e0 Cattolica del Sacro Cuore, Milan, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Leonardo","family":"Mendolicchio","sequence":"additional","affiliation":[{"name":"Laboratorio Sperimentale di Ricerche di Neuroscienze Metaboliche e U.O. di Riabilitazione dei Disturbi Alimentari e della Nutrizione, IRCCS Istituto Auxologico Italiano, Ospedale San Giuseppe, Piancavallo, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2450-4903","authenticated-orcid":false,"given":"Matthew R.","family":"Longo","sequence":"additional","affiliation":[{"name":"School of Psychological Sciences, Faculty of Science, Birkbeck, University of London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2025,11,21]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"crossref","unstructured":"Ambron E. 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