TiC-MuFormer: Time-Aware Caption-Integrated Multimodal Transformers for User-Level Mental Health Modeling
Summary
Inferring mental health risk from a person's social media history means combining text, images and post timing. These signals are hard to merge for three reasons: emotionally revealing posts are rare, people post at irregular intervals, and an image often carries meaning that its short caption-free text does not. The authors propose TiC-MuFormer, a multimodal transformer that addresses this in two steps. First, an instruction-tuned captioning model describes each picture in words, and that description is attached to the post text. Second, temporal embeddings are added before cross-modal attention, so posting rhythm can shape how the modalities are aligned. Each user is represented by a sampled window of consecutive posts. On the Twitter depression benchmark of Shen et al. (2017), the model reportedly outperforms earlier text-only and multimodal systems on every user-level metric. Ablations examine window length, batch size and text encoder. The study suggests that verbalising images and modelling time explicitly improve user-level risk detection. The authors caution that the system is not a clinical tool and has only been tested on one demographically narrow dataset.
Key points
- Data and setup: experiments are run on the Twitter-based mental health corpus released by Shen et al. (2017). The ablation configuration combines CLIP image embeddings, Time2Vec temporal encoding and a RoBERTa or EmoBERTa text encoder.
- Window size: longer post windows help steadily. F1 rises from 0.887 at K=32 to 0.971 at K=512 (RoBERTa, B=128).
- Batch size: B=128 beats B=256. At K=512, F1 drops to 0.964 for RoBERTa and 0.927 for EmoBERTa with the larger batch.
- Text encoder: general-purpose RoBERTa (0.971) outperforms emotion-tuned EmoBERTa (0.955). The authors attribute this to captions already bringing affective cues into the text stream.
- Limitations:
- The data over-represents young US users.
- Labels are self-reported rather than clinically verified.
- Generated captions may introduce bias or hallucinated content.
Cite
@inproceedings{tsoumplekas2026tic,
title = {{TiC-MuFormer: Time-Aware Caption-Integrated Multimodal Transformers for User-Level Mental Health Modeling}},
author = {Tsoumplekas, Georgios and Spyridis, Yannis and Argyriou, Vasileios},
booktitle = {Proceedings of the Fifteenth Language Resources and Evaluation Conference},
year = {2026},
doi = {10.63317/4pyjbjj5hsvt},
url = {https://doi.org/10.63317/4pyjbjj5hsvt}
}References
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