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Acceptance and Commitment Therapy modules: Differential impact on treatment processes and outcomes.

Jennifer L Villatte1, Roger Vilardaga1, Matthieu Villatte2

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Behaviour Research and Therapy
|December 31, 2015
PubMed
Summary

This study shows that modular components of Acceptance and Commitment Therapy (ACT) effectively improve mental health. Both ACT OPEN and ACT ENGAGED modules demonstrated significant benefits for psychiatric symptoms and quality of life.

Keywords:
AcceptanceAcceptance and commitment therapyComponent analysisMindfulnessModular designSingle case experimental designTherapy processValues

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Area of Science:

  • Psychology
  • Psychiatry
  • Clinical Psychology

Background:

  • Modular, transdiagnostic approaches can enhance the public health impact of psychosocial interventions.
  • Evidence is limited regarding the independent functioning of treatment components in clinical settings.

Purpose of the Study:

  • To demonstrate the specificity of treatment effects for two components of Acceptance and Commitment Therapy (ACT).
  • To evaluate the efficacy of modular ACT components in a clinical service setting.

Main Methods:

  • A randomized, nonconcurrent, multiple-baseline design across 15 adult participants.
  • Examined the effects of ACT OPEN (acceptance, cognitive defusion) and ACT ENGAGED (values-based activation, persistence) modules.
  • Utilized Tau-U analyses to assess changes in therapeutic processes and outcomes.

Main Results:

  • Both ACT modules significantly improved psychiatric symptoms, quality of life, and targeted processes.
  • ACT ENGAGED showed greater improvements in quality of life and values-based activation.
  • ACT OPEN demonstrated greater improvements in symptom severity, acceptance, and defusion.
  • Both modules enhanced awareness and non-reactivity, with high acceptability, completion, and satisfaction.
  • Treatment effects were maintained at 3-month follow-up.

Conclusions:

  • ACT components are effective as standalone modules for improving mental health outcomes.
  • These findings support the integration of modular ACT components into transdiagnostic treatment approaches.
  • Modular interventions offer a promising strategy for increasing the reach of evidence-based psychological treatments.