PreprintCited by 49Mindfulness and Compassion InterventionsPain Management and Placebo EffectPain Mechanisms and Treatments

Neural Mechanisms of Acceptance and Commitment Therapy for Chronic Pain: A Network-Based fMRI Approach

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Aytur, Semra A., Ray, Kimberly L., Meier, Sarah K., Campbell, Jenna, Gendron, Barry, Waller, Noah, Robin, Donald A.·2020·Frontiers in Human Neuroscience

Abstract

Over 100 million Americans suffer from chronic pain (CP), which causes more disability than any other medical condition in the U.S. at a cost of $560-$635 billion per year (IOM, 2011). Opioid analgesics are frequently used to treat CP. However, long term use of opioids can cause brain changes such as opioid-induced hyperalgesia that, over time, increase pain sensation. Also, opioids fail to treat complex psychological factors that worsen pain-related disability, including beliefs about and emotional responses to pain. Cognitive behavioral therapy (CBT) can be efficacious for CP. However, CBT generally does not focus on important factors needed for long-term functional improvement, including attainment of personal goals and the psychological flexibility to choose responses to pain. Acceptance and Commitment Therapy (ACT) has been recognized as an effective, non-pharmacologic treatment for a variety of CP conditions. However, little is known about the neurologic mechanisms underlying ACT. We conducted an ACT intervention in women (n=9) with chronic musculoskeletal pain. Functional magnetic resonance imaging (fMRI) data were collected pre- and post-ACT, and changes in functional connectivity (FC) were measured using Network-Based Statistics (NBS). Behavioral outcomes were measured using validated assessments such as the Acceptance & Action Questionnaire (AAQ-II), the Chronic Pain Acceptance Questionnaire (CPAQ), the Center for Epidemiologic Studies Depression Scale (CES-D), and the NIH Toolbox Neuro-QoL™ (Quality of Life in Neurological Disorders) scales. Results suggest that, following the four-week ACT intervention, participants exhibited reductions in brain activation within and between key networks including self-reflection (default mode, DMN), emotion (salience, SN), and cognitive control (frontal parietal, FPN). These changes in connectivity strength were correlated with changes in behavioral outcomes including decreased depression and pain interference, and increased participation in social roles. This study is one of the first to demonstrate that improved function across the DMN, SN, and FPN may drive the positive outcomes associated with ACT. This study contributes to the emerging evidence supporting the use of neurophysiological indices to characterize treatment effects of alternative and complementary mind-body therapies. Perspective: This article identifies neural mechanisms that may mediate behavioral changes associated with Acceptance and Commitment Therapy (ACT) in persons with chronic musculoskeletal pain. This information could potentially help clinicians to determine which mind-body therapies may benefit specific patients as part of an integrative pain management approach.

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Crossref · 10.1101/2020.08.10.20144063

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  • In the initial report, effects were observed in 10 nodes out of 101 triple-network nodes, and those same 10 nodes were used in the following analysis with the seven pain nodes.

    “In our initial report [21] we tested for changes in brain networks underlying ACT-related outcomes in those with CMP using only triple network nodes without the inclusion of pain nodes (t > 2.1 for the 101 nodes of the DMN, FPN, and SN). We observed effects in 10 nodes out of 101 triple network nodes and used those same 10 for the following analysis in conjunction with Waller and colleagues’ [35]”

    From Graph theory analysis of induced neural plasticity post-Acceptance and Commitment Therapy for chronic pain (2020) · cites this paper as [21]

    The Methods (Network Based Statistic; page unavailable) say the initial analysis tested all 101 DMN, FPN, and SN nodes, and the Results identify a network of 10 nodes with ACT-related connectivity changes. The cited paper reports a threshold of t > 2.5, not t > 2.1. It does not document the subsequent analysis combining those 10 nodes with seven pain nodes. (LLM, conf=0.86)

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  • The functional connectivity changes involving regions of the DMN, FPN, SN, and pain network, alongside previously reported positive behavioral outcomes, are convincing underlying reasons for how ACT effectively alleviates chronic pain symptomology.

    “These functional connectivity changes involving regions of the DMN, FPN, SN, and pain network (alongside previously reported positive behavioral outcomes, [21]) are convincing underlying reasons for the way ACT effectively alleviates chronic pain symptomology.”

    From Graph theory analysis of induced neural plasticity post-Acceptance and Commitment Therapy for chronic pain (2020) · cites this paper as [21]

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  • Decreased functional connectivity in the left putamen/right insula and left insula/right thalamus may contribute to enhanced quality of life reported post-ACT.

    “So, decreased functional connectivity in these regions may contribute to enhanced quality of life that is reported post-ACT [21,40].”

    From Graph theory analysis of induced neural plasticity post-Acceptance and Commitment Therapy for chronic pain (2020) · cites this paper as [21]

    The Results (Network Based Statistic and Correlation Analysis; page not available) report decreased functional connectivity after ACT and associations between some connectivity changes and quality-of-life measures. They identify different connections, however, and do not link left putamen–right insula or left insula–right thalamus connectivity to improved quality of life. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Aytur and colleagues' results suggest that heightened connectivity between the triple network returned to a lower, healthier level of connectivity post-ACT.

    “Those results suggest that levels of heightened connectivity between the triple network returned to a lower, healthier level of connectivity post-ACT.”

    From Graph theory analysis of induced neural plasticity post-Acceptance and Commitment Therapy for chronic pain (2020) · cites this paper as [21]

    The Results (Network Based Statistic; page unavailable) report decreased functional connectivity in 10 connections of the triple network after ACT, and the Correlation Analysis links several connectivity changes to behavioral improvements. The paper does not establish that connectivity returned to a previously healthy or normal level; it reports a decrease, not a measured return to such a benchmark. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Available evidence points to neurophysiological brain correlates of clinical improvement after acceptance and commitment therapy in chronic pain, supporting the usefulness of acceptance and commitment therapy in chronic pain populations such as central pain sensitization syndromes.

    “Additionally, available evidence points to the neurophysiological brain correlates of clinical improvement after ACT in chronic pain [88,89], supporting the usefulness of ACT in chronic pain populations such as CPSS.”

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Authors
Aytur, S. A., Ray, K. L., Meier, S. K., Campbell, J., Gendron, B., Waller, N., & Robin, D. A.
Affiliations
  • University of New Hampshire (US)
  • The University of Texas at Austin (US)
  • Wentworth Douglass Hospital (US)
Corresponding author
Aytur, Semra A.
Venue
Frontiers in Human Neuroscience
Publisher
openRxiv
Published
2020-08-13
Volume
15
Pages
587018-587018
ISSN
1662-5161 (ISSN-L)
OpenAlex
W3129133049
Cited by
49
References
117
Citations by year
2026: 4 · 2025: 10 · 2024: 7 · 2023: 12 · 2022: 10 · 2021: 5 · 2020: 1
FWCI
5.80
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Human Neuroscience (publishedVersion, cc-by)
  • medRxiv (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Social Sciences › Psychology › Clinical Psychology › Mindfulness and Compassion Interventions
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Pain Management and Placebo Effect
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
acceptance and commitment therapy, chronic pain, chronic musculoskeletal pain, functional connectivity, default mode network, salience network, frontoparietal network, psychological flexibility, pain interference, depression, quality of life, mind-body interventions, network-based statistics

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