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This is one component of a solution aimed at extracting possible health outcome measures based on expression, voice acoustics and speech sentiment from video diary data provided by patients. Forty healthy volunteers viewed 21 validated images from the International Affective Picture System database through a mobile app which simultaneously captured video footage of their face using the selfie camera. Images were intended to be associated with the following emotional responses: anger, disgust, sadness, contempt, fear, surprise and happiness. Both valence and arousal scores estimated from the video footage associated with each image were adequate predictors of the IAPS image scores (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001 and <jats:italic>p<\/jats:italic>\u2009=\u20090.04 respectively). 12.2% of images were categorised as containing a positive expression response in line with the target expression; with happiness and sadness responses providing the greatest frequency of responders: 41.0% and 21.4% respectively. 71.2% of images were associated with no change in expression. This proof-of-concept study provides early encouraging findings that changes in facial expression can be detected when they exist. Combined with voice acoustical measures and speech sentiment analysis, this may lead to novel measures of health status in patients using a video diary in indications including depression, schizophrenia, autism spectrum disorder and PTSD amongst other conditions.<\/jats:p>","DOI":"10.1007\/s10916-020-01671-x","type":"journal-article","created":{"date-parts":[[2020,11,11]],"date-time":"2020-11-11T16:02:37Z","timestamp":1605110557000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Proof-of-Concept Study: a Mobile Application to Derive Clinical Outcome Measures from Expression and Speech for Mental Health Status Evaluation"],"prefix":"10.1007","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6908-7365","authenticated-orcid":false,"given":"Francesco Luke","family":"Siena","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9269-9802","authenticated-orcid":false,"given":"Michael","family":"Vernon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0133-6687","authenticated-orcid":false,"given":"Paul","family":"Watts","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9186-4271","authenticated-orcid":false,"given":"Bill","family":"Byrom","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6030-3631","authenticated-orcid":false,"given":"David","family":"Crundall","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1006-0942","authenticated-orcid":false,"given":"Philip","family":"Breedon","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,11,11]]},"reference":[{"key":"1671_CR1","doi-asserted-by":"publisher","first-page":"841","DOI":"10.1016\/S0140-6736(07)61414-7.Worldwide","volume":"370","author":"PS Wang","year":"2007","unstructured":"Wang PS et al. 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