Empirical Modeling of Therapist-Client Dynamics in Psychotherapy Using LLM-Based Assessments

• URL: http://arxiv.org/abs/2602.12450v1
• Date: Thu, 12 Feb 2026 22:14:07 GMT
• Title: Empirical Modeling of Therapist-Client Dynamics in Psychotherapy Using LLM-Based Assessments
• Authors: Angela Chen, Siwei Jin, Canwen Wang, Holly Swartz, Tongshuang Wu, Robert E Kraut, Haiyi Zhu,
• Abstract summary: This work advances a computational approach for modeling these moment-to-moment processes.<n>We first developed automated methods to assess therapist behaviors.<n>We then analyzed nearly 2,000 hours of psychotherapy transcripts.
• Score: 26.83728974046223
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Psychotherapy is a primary treatment for many mental health conditions, yet the interplay among therapist behaviors, client responses, and the therapeutic relationship remains difficult to untangle. This work advances a computational approach for modeling these moment-to-moment processes. We first developed automated methods using large language models (LLMs) to assess therapist behaviors (e.g., empathy, exploration), relational qualities (e.g., rapport), and client outcomes (e.g., disclosure, self-directed and outward-directed negative emotions). These measures showed strong alignment with human ratings (mean Pearson $r = .66$). We then analyzed nearly 2,000 hours of psychotherapy transcripts from the Alexander Street corpus using Structural Equation Modeling (SEM). SEM showed that therapist empathy and exploration directly shaped client disclosure and emotional expression, whereas rapport may contribute to reductions in internal emotional distress rather than increased willingness to express it. Together, these findings demonstrate how computational tools can capture core therapeutic processes at scale and offer new opportunities for understanding, modeling, and improving therapist training.

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