{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T20:53:00Z","timestamp":1775076780697,"version":"3.50.1"},"reference-count":74,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T00:00:00Z","timestamp":1703635200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Digital health applications using Artificial Intelligence (AI) are a promising opportunity to address the widening gap between available resources and mental health needs globally. Increasingly, passively acquired data from wearables are augmented with carefully selected active data from depressed individuals to develop Machine Learning (ML) models of depression based on mood scores. However, most ML models are black box in nature, and hence the outputs are not explainable. Depression is also multimodal, and the reasons for depression may vary significantly between individuals. Explainable and personalised models will thus be beneficial to clinicians to determine the main features that lead to a decline in the mood state of a depressed individual, thus enabling suitable personalised therapy. This is currently lacking. Therefore, this study presents a methodology for developing personalised and accurate Deep Learning (DL)-based predictive mood models for depression, along with novel methods for identifying the key facets that lead to the exacerbation of depressive symptoms. We illustrate our approach by using an existing multimodal dataset containing longitudinal Ecological Momentary Assessments of depression, lifestyle data from wearables and neurocognitive assessments for 14 mild to moderately depressed participants over one month. We develop classification- and regression-based DL models to predict participants\u2019 current mood scores\u2014a discrete score given to a participant based on the severity of their depressive symptoms. The models are trained inside eight different evolutionary-algorithm-based optimisation schemes that optimise the model parameters for a maximum predictive performance. A five-fold cross-validation scheme is used to verify the DL model\u2019s predictive performance against 10 classical ML-based models, with a model error as low as 6% for some participants. We use the best model from the optimisation process to extract indicators, using SHAP, ALE and Anchors from explainable AI literature to explain why certain predictions are made and how they affect mood. These feature insights can assist health professionals in incorporating personalised interventions into a depressed individual\u2019s treatment regimen.<\/jats:p>","DOI":"10.3390\/s24010164","type":"journal-article","created":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T10:23:54Z","timestamp":1703672634000},"page":"164","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Towards Personalised Mood Prediction and Explanation for Depression from Biophysical Data"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7180-7333","authenticated-orcid":false,"given":"Sobhan","family":"Chatterjee","sequence":"first","affiliation":[{"name":"Department of Electrical, Computer and Software Engineering, Faculty of Engineering, University of Auckland, Auckland 1010, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6612-4557","authenticated-orcid":false,"given":"Jyoti","family":"Mishra","sequence":"additional","affiliation":[{"name":"Neural Engineering and Translation Labs, Department of Psychiatry, University of California, San Diego, CA 92093, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6311-9856","authenticated-orcid":false,"given":"Frederick","family":"Sundram","sequence":"additional","affiliation":[{"name":"Department of Psychological Medicine, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1023, New Zealand"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9654-5678","authenticated-orcid":false,"given":"Partha","family":"Roop","sequence":"additional","affiliation":[{"name":"Department of Electrical, Computer and Software Engineering, Faculty of Engineering, University of Auckland, Auckland 1010, New Zealand"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,27]]},"reference":[{"key":"ref_1","unstructured":"National Collaborating Centre for Mental Health (UK) (2010). 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