{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T15:48:10Z","timestamp":1785167290191,"version":"3.55.0"},"reference-count":39,"publisher":"American Academy of Audiology","issue":"9","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["j am acad audiol"],"published-print":{"date-parts":[[2020,10,1]]},"abstract":"<jats:p><jats:bold>Abstract<\/jats:bold>  <jats:bold>Background<\/jats:bold>\u2003Patients with dementia commonly have problems processing speech in the presence of competing background speech or noise. This difficulty can be present from the very early stages of dementia, and may be a preclinical feature of Alzheimer's\n disease. <jats:bold>Purpose<\/jats:bold>\u2003This study investigates whether people with dementia perform worse on the dichotic digit test (DDT), an experimental probe of speech processing in the presence of competing speech, and whether test performance may predict dementia onset. <jats:bold>Research Design<\/jats:bold>\u2003Systematic\n review and meta-analysis. <jats:bold>Data Collection and Analysis<\/jats:bold>\u2003A literature search was conducted in Medline, Embase, Scopus, and Psycinfo. We included (1) studies that included people with a diagnosis of dementia and a healthy control group with no cognitive impairment; (2) studies\n that reported results from a DDT in a free-recall response task; and (3) studies that had the dichotic digit mean correct percentage score or right-ear advantage, as outcome measurements. <jats:bold>Results<\/jats:bold>\u2003People with dementia had a lower DDT total score, with a pooled mean difference\n of 18.6% (95% confidence interval [CI]: 21.2\u201015.9). Patients with dementia had an increased right-ear advantage relative to controls with a pooled difference of 24.4% (95% CI: 21.8\u201027.0). <jats:bold>Conclusion<\/jats:bold>\u2003The DDT total scores are lower and the right-ear advantage increased\n in cognitively impaired versus normal control participants. The findings also suggest that the reduction of dichotic digit total score and increase of right-ear advantage progress as cognitive impairment increases. Whether abnormalities in dichotic digit scores could predict subsequent dementia\n onset should be examined in further longitudinal studies.<\/jats:p>","DOI":"10.1055\/s-0040-1718700","type":"journal-article","created":{"date-parts":[[2020,12,9]],"date-time":"2020-12-09T23:53:46Z","timestamp":1607558026000},"page":"646-655","source":"Crossref","is-referenced-by-count":23,"title":["\u201cThe Dichotic Digit Test\u201d as an Index Indicator for Hearing Problem in Dementia: Systematic Review and Meta-Analysis"],"prefix":"10.3766","volume":"31","author":[{"given":"Nattawan","family":"Utoomprurkporn","sequence":"first","affiliation":[{"name":"UCL Ear Institute, Faculty of Brain Science, University College London, London, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chris J.D.","family":"Hardy","sequence":"additional","affiliation":[{"name":"Dementia Research Centre, Faculty of Brain Science, University College London, London, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joshua","family":"Stott","sequence":"additional","affiliation":[{"name":"Division of Psychology and Language Science, Faculty of Brain Sciences, University College London, Gower Street, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergi G.","family":"Costafreda","sequence":"additional","affiliation":[{"name":"Division of Psychiatry, Faculty of Brain Sciences, University College London, Gower Street, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason","family":"Warren","sequence":"additional","affiliation":[{"name":"Dementia Research Centre, Faculty of Brain Science, University College London, London, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Doris Eva","family":"Bamiou","sequence":"additional","affiliation":[{"name":"UCL Ear Institute, Faculty of Brain Science, University College London, London, United 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