Robust and Explainable Depression Identification from Speech Using Vowel-Based Ensemble Learning Approaches

Published: 25 Sept 2024, Last Modified: 21 Oct 2024IEEE BHI'24EveryoneRevisionsBibTeXCC BY 4.0
Keywords: Mental Health, Depression Diagnosis/ Screening, Ensemble Learning, Explainable AI, Speech
Abstract: This study investigates explainable machine learning algorithms for identifying depression from speech. Grounded in evidence from speech production that depression affects motor control and vowel generation, pre-trained vowel-based embeddings, that integrate semantically meaningful linguistic units, are used. Following that, an ensemble learning approach decomposes the problem into constituent parts characterized by specific depression symptoms and severity levels. Two methods are explored: a "bottom-up" approach with 8 models predicting individual Patient Health Questionnaire-8 (PHQ-8) item scores, and a "top-down" approach using a Mixture of Experts (MoE) with a router module for assessing depression severity. Both methods depict performance comparable to state-of-the-art baselines, demonstrating robustness and reduced susceptibility to dataset mean/median values. System explainability benefits are discussed highlighting their potential to assist clinicians in depression diagnosis and screening.
Track: 4. AI-based clinical decision support systems
Registration Id: DZNFRLMZ9ZR
Submission Number: 53
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