Volume 62, Issue 1 e14742
ORIGINAL ARTICLE

Within- and between therapist variability in movement and physiological synchrony and its effects on symptom change

Jessica Uhl

Corresponding Author

Jessica Uhl

Department of Clinical Psychology and Psychotherapy, University Trier, Trier, Germany

Correspondence

Jessica Uhl, Department of Clinical Psychology and Psychotherapy, University of Trier, 54296 Trier, Germany.

Email: [email protected]

Contribution: Conceptualization, Data curation, Formal analysis, ​Investigation, Methodology, Project administration, Writing - original draft

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Uwe Altmann

Uwe Altmann

Department of Psychology, MSB Medical School Berlin, Berlin, Germany

Contribution: Conceptualization, Formal analysis, Methodology, Writing - review & editing

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Eshkol Rafaeli

Eshkol Rafaeli

Department of Psychology, Bar-Ilan University, Ramat Gan, Israel

Contribution: Project administration, Resources, Supervision, Writing - review & editing

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Patrick Bungart

Patrick Bungart

Department of Clinical Psychology and Psychotherapy, University Trier, Trier, Germany

Contribution: Data curation, Formal analysis, Writing - original draft

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Wolfgang Lutz

Wolfgang Lutz

Department of Clinical Psychology and Psychotherapy, University Trier, Trier, Germany

Contribution: Funding acquisition, Project administration, Resources, Supervision, Writing - review & editing

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First published: 17 December 2024

Abstract

The predictive power of movement and electrodermal activity (EDA) synchrony has been demonstrated in various studies. Although most studies have examined each synchrony modality separately, a growing interest in the simultaneous investigation of multiple modalities has emerged. Previous research has demonstrated the importance of disentangling within and between-dyad effects, however within and between-therapist effects have yet to be investigated. The aim of the present study was to test whether movement and EDA synchrony (measured both within and between therapists) predict across-session symptom change in two types of interventions (emotion-focused vs. cognitive). The results are based on 990 session segments of 90 clients with test anxiety who were treated with a six-session treatment program by 22 therapists, treating 3–15 clients each. Movement synchrony (on the basis of motion energy analysis (MEA) values) and EDA synchrony were quantified using cross-correlations. Symptom severity was assessed before each session using the state test anxiety measure. Movement and EDA synchrony correlated negatively (−0.19, p < .001). Moreover, higher movement synchrony as well as an interaction between movement and EDA synchrony was significantly associated with symptom improvement within, but not between therapists. In addition, an interaction between EDA synchrony and cognitive (versus emotion-focused) interventions was significantly associated with symptom improvement. These results provide initial evidence that therapists' average levels of synchrony may matter less than how synchronous they are with a specific client.

CONFLICT OF INTEREST STATEMENT

We have no conflict of interest to disclose.

DATA AVAILABILITY STATEMENT

The data sets analyzed in the current study are available from the corresponding author on reasonable request.

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