Physiological synchrony in psychotherapy sessions

Area of Science:

• Psychophysiology
• Clinical Psychology
• Human-Computer Interaction

Background:

• Physiological synchrony, or the coordination of bodily processes between individuals, is increasingly recognized in social interactions.
• Understanding synchrony in therapeutic settings may offer insights into the mechanisms of change in psychotherapy.
• Previous research has explored synchrony in various interpersonal contexts, but less is known about its presence and impact within naturalistic psychotherapy.

Purpose of the Study:

• To investigate the existence of physiological synchrony between a therapist and clients during dyadic psychotherapy sessions.
• To explore the association between physiological synchrony and client self-report ratings of the therapy process, including alliance.
• To assess the feasibility of using physiological signal analysis to detect synchrony in a naturalistic clinical setting.

Main Methods:

• Simultaneous monitoring of therapist and client electrocardiograms (ECG) and respiration during 55 psychotherapy sessions.
• Derivation of heart rate (HR) and heart rate variability (HRV) from ECG in 15-second intervals.
• Application of windowed cross-correlation and concordance methods to assess synchrony in respiration, ECG, HR, and HRV, with surrogate controls.

Main Results:

• Significant physiological synchrony was detected in respiration, HR, and HRV, but not in ECG measures.
• Regression analyses revealed associations between observed synchronies and client-reported alliance and other self-report variables.
• The methodology proved feasible for deriving signatures of physiological synchrony in psychotherapy.

Conclusions:

• The findings support the presence of physiological synchrony in psychotherapy sessions, suggesting sympathetic and parasympathetic nervous system coupling between therapist and clients.
• Physiological synchrony appears linked to the quality of the therapeutic process and alliance ratings.
• Further research is needed to generalize these findings across diverse therapeutic dyads and contexts.