Prompt-Based Modeling of Moments of Change and Change Summaries in Mental Health Timelines

Duc Do, Tin Pham, Vu Tran, Minh Nguyen


Abstract
This paper presents our prompt-based approach for modeling mental health timelines from Reddit user posts. We address two tasks: identifying moments of change and generating summaries of clinically meaningful changes across post sequences. Our framework uses large language models with in-context learning to analyze self-states and mental health indicators without task-specific fine-tuning. We build an inference pipeline with vLLM and Qwen2.5-72B-Instruct-GPTQ-Int8, and experiment with few-shot prompting, and balanced few-shot sampling. We also examine how the number of visible posts affects the model’s ability to capture temporal changes. Our results suggest that prompt-based methods provide a practical and competitive baseline in low-resource and sensitive mental health settings, particularly for modeling self-state dynamics and generating summaries of psychological change over time.
Anthology ID:
2026.clpsych-1.40
Volume:
Proceedings of the 10th Workshop on Computational Linguistics and Clinical Psychology (CLPsych 2026)
Month:
July
Year:
2026
Address:
San Diego, California, USA
Editors:
Aya Zirikly, Kfir Bar, Sean MacAvaney, Molly Ireland, Yaakov Ophir, Dana Atzil-Slonim, Vasudha Varadarajan, Steven Bedrick, Bart Desmet
Venues:
CLPsych | WS
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
504–509
Language:
URL:
https://preview.aclanthology.org/ingest-acl-workshops/2026.clpsych-1.40/
DOI:
Bibkey:
Cite (ACL):
Duc Do, Tin Pham, Vu Tran, and Minh Nguyen. 2026. Prompt-Based Modeling of Moments of Change and Change Summaries in Mental Health Timelines. In Proceedings of the 10th Workshop on Computational Linguistics and Clinical Psychology (CLPsych 2026), pages 504–509, San Diego, California, USA. Association for Computational Linguistics.
Cite (Informal):
Prompt-Based Modeling of Moments of Change and Change Summaries in Mental Health Timelines (Do et al., CLPsych 2026)
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PDF:
https://preview.aclanthology.org/ingest-acl-workshops/2026.clpsych-1.40.pdf