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Distorted interactions reportedly affect infant attachment and socioemotional development and may be associated with maternal early adversity and trauma. Limited measures are available that could be used as screening tools of DMRs. The aims of this study were to (a) describe the development of the Mother\u2013Infant Relationship Scale (MIRS) and (b) to evaluate its psychometric properties. The development and validation of the MIRS closely followed standard guidelines for the development of psychometric tests. Psychometric properties were examined across two samples: 78 adult psychiatric patients with features of borderline personality and 86 individuals from a nonclinical sample (<jats:italic>N<\/jats:italic>\u00a0=\u00a0164). The scale demonstrated excellent internal consistency (Cronbach's \u03b1\u00a0=\u00a0.91) for the clinical sample and adequate internal consistency (.78) for the nonclinical sample, excellent test\u2010retest reliability (intraclass correlation coefficient\u00a0=\u00a0.81), and good concurrent validity with an observational (Pearson's correlation coefficients\u00a0=\u00a0\u2212.35 to \u2212.54) and a representational measure (.53). Factor analysis revealed three components: DMRs specific to (a) maternal hostility\/rejection of the infant, (b) issues about parenting\/attachment, and (c) anxiety\/helplessness about infant care. Findings suggest that the MIRS is a reliable and valid screening tool of DMRs. Potential uses in clinical and research settings are discussed.<\/jats:p>","DOI":"10.1002\/imhj.21826","type":"journal-article","created":{"date-parts":[[2019,11,8]],"date-time":"2019-11-08T06:24:15Z","timestamp":1573194255000},"page":"40-55","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Development and initial reliability and validity of a new measure of distorted maternal representations: The Mother\u2013Infant Relationship Scale"],"prefix":"10.1002","volume":"41","author":[{"given":"Vesna","family":"Newman\u2010Morris","sequence":"first","affiliation":[{"name":"School of Psychological Sciences Monash University  Melbourne Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kylie M.","family":"Gray","sequence":"additional","affiliation":[{"name":"Centre for Developmental Psychiatry &amp; Psychology Department of Psychiatry School of Clinical Sciences Monash University  Melbourne Australia"},{"name":"Centre for Educational Development Appraisal and Research University of Warwick  Coventry United Kingdom"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katrina","family":"Simpson","sequence":"additional","affiliation":[{"name":"School of Psychological Sciences Monash University  Melbourne Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Louise K.","family":"Newman","sequence":"additional","affiliation":[{"name":"Centre for Women's Mental Health Royal Women's Hospital  Melbourne Australia"},{"name":"Department of Psychiatry University of Melbourne  Melbourne Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,11,7]]},"reference":[{"issue":"4","key":"e_1_2_7_2_1","first-page":"1038","article-title":"Stability and change in mothers\u2019 representations of their relationship with their toddlers","volume":"35","author":"Aber J. 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