Cross-Modal Alignment and Rectified Flow-Based Latent Representation Synthesis for Enhanced Speech-Driven Alzheimer's Disease Detection.

Overview

1. Department of Artificial Intelligence, Institute of Artificial Intelligence, Xiamen University, Xiamen 361005, China
2. School of Informatics, Xiamen University, 422 Siming South Road, Xiamen 361005, China

Abstract

To address the limited accuracy of speech-based Alzheimer’s Disease (AD) screening and the shortage of paired multimodal data, this paper proposes a detection framework based on feature alignment and Rectified Flow-driven latent representation generation. The EEG dataset consists of 36 AD patients and 29 Healthy Controls (HC). The speech dataset contains 399 samples, which include 114 AD cases, 132 Mild Cognitive Impairment (MCI) cases, and 153 HC cases. We extracted multidimensional features of EEG signals, such as time-domain and frequency-domain characteristics, alongside behavioral representations of speech. A heterogeneous alignment network was used to map these features into a common semantic subspace, where an adaptive interpolation strategy reconstructed the missing pathological trajectories of MCI within the latent space. On this basis, a conditional Rectified Flow model was introduced to learn the optimal transport mapping from speech to EEG. This model generated physiological-information-rich latent representations to compensate for semantic gaps. Experimental results showed that the fused features from speech and latent representations achieved a three-class classification accuracy of 89.08%, a precision of 88.77%, and a recall of 88.71%. This performance represented an accuracy improvement of 9.28% compared with the speech-based baseline system. Our method combines the convenience of speech screening with the high reliability of neurophysiological signals, and it provides a new approach for low-cost early detection of AD.

Reproduced under the paper's license (CC BY), from the paper cited above.

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Data

Datasets cited

• openneuro:ds004504, at OpenNeuro; found in “Data Availability Statement”

Data Availability Statement

The EEG data used in this study are derived from public domain resources. The dataset is available at https://openneuro.org/datasets/ds004504/versions/1.0.8, accessed on 11 September 2024.

Reproduced under the paper's license (CC BY), from the paper cited above.

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Version 1, 30 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 3 authors, 7 keywords, 3 funders, 45 references.

Cite

This paper

Xiang, S., Ling, H., & Wu, M. (2026). Cross-Modal Alignment and Rectified Flow-Based Latent Representation Synthesis for Enhanced Speech-Driven Alzheimer's Disease Detection. Bioengineering (Basel, Switzerland), 13(3), 370. https://doi.org/10.3390/bioengineering13030370

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