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A single session of low-frequency repetitive transcranial magnetic stimulation (rTMS) did not specifically reduce gambling craving in pathological gamblers. A strong placebo effect may explain the lack of specific efficacy for this addiction treatment.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Addiction Medicine

Background:

  • Craving is a central symptom in addictive disorders like pathological gambling.
  • Repetitive transcranial magnetic stimulation (rTMS) targeting the dorsolateral prefrontal cortex (DLPFC) is explored for addiction treatment.
  • Previous research suggests rTMS may reduce craving, but efficacy needs further investigation.

Purpose of the Study:

  • To investigate the efficacy of a single session of low-frequency (1 Hz) rTMS applied to the right DLPFC in reducing cue-induced gambling craving.
  • To assess the impact of rTMS on both subjective craving and physiological responses in pathological gamblers.

Main Methods:

  • A within-subject crossover design involving 30 treatment-seeking pathological gamblers.
  • Participants received both active and sham low-frequency rTMS in a randomized, blinded manner.
  • Outcome measures included Visual Analog Scale (VAS) and Gambling Craving Scale (GCS) for craving, plus heart rate and blood pressure.

Main Results:

  • Both active and sham rTMS sessions significantly decreased gambling urge, indicating a potential placebo effect.
  • No specific reduction in cue-induced craving was observed for active rTMS compared to sham.
  • Repetitive transcranial magnetic stimulation was well-tolerated, and the sham procedure was deemed credible.

Conclusions:

  • A single session of low-frequency rTMS to the right DLPFC did not demonstrate specific efficacy in reducing cue-induced gambling craving.
  • The observed urge reduction was likely due to a strong placebo effect and potentially suboptimal rTMS parameters.
  • Despite negative findings, rTMS remains a promising therapeutic avenue for addiction, warranting further research with refined protocols.