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Effects of Combining a Brief Cognitive Intervention with Transcranial Direct Current Stimulation on Pain Tolerance: A

Abigail Powers1, Alok Madan2,3, Megan Hilbert4

  • 1Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia.

Pain Medicine (Malden, Mass.)
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Combining cathodal transcranial direct current stimulation (tDCS) with a brief cognitive intervention (BCI) showed the greatest pain relief. This pilot study suggests potential for combined therapies in pain management.

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Area of Science:

  • Neuroscience
  • Pain Management
  • Psychology

Background:

  • Cognitive behavioral therapy (CBT) is effective for chronic pain.
  • Minimally invasive brain stimulation shows analgesic potential.
  • Few studies combine these approaches for pain relief.

Purpose of the Study:

  • To investigate the combined effects of cognitive restructuring and transcranial direct current stimulation (tDCS) on pain tolerance.
  • To explore different tDCS polarities (anodal/cathodal) and cognitive interventions.
  • To assess the analgesic effects of combined interventions in a controlled laboratory setting.

Main Methods:

  • A randomized, double-blind, placebo-controlled pilot study with 79 healthy adults.
  • Participants were assigned to six groups: anodal tDCS + brief cognitive intervention (BCI), anodal tDCS + pain education, cathodal tDCS + BCI, cathodal tDCS + pain education, sham tDCS + BCI, or sham tDCS + pain education.
  • Thermal pain tolerance was measured pre- and post-intervention using the Method of Limits.

Main Results:

  • A significant interaction effect between time and group was observed for thermal pain tolerance.
  • Five active intervention groups showed improved pain tolerance compared to the control group (sham tDCS + pain education).
  • Cathodal tDCS combined with BCI demonstrated the most significant analgesic effect.

Conclusions:

  • Combining cathodal tDCS with a brief cognitive intervention produced the largest analgesic effect.
  • Future research could explore enhanced interactive effects with higher doses of tDCS and cognitive interventions.
  • Implications for chronic pain management require further investigation due to the use of an acute pain model and a non-CBT cognitive intervention.