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Related Experiment Video

Updated: Jan 28, 2026

Brain Imaging Investigation of the Neural Correlates of Emotion Regulation
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Selective photobiomodulation for emotion regulation: model-based dosimetry study.

Paolo Cassano1,2, Anh Phong Tran3, Husam Katnani4

  • 1Massachusetts General Hospital, Depression Clinical and Research Program, Center for Anxiety and Traumatic Stress Disorders, Boston, Massachusetts, United States.

Neurophotonics
|February 24, 2019
PubMed
Summary

Transcranial photobiomodulation (t-PBM) effectively delivers light to brain regions crucial for treating major depressive disorder (MDD). Simulations show optimal wavelengths and non-invasive methods for targeting dlPFC and vmPFC, enhancing emotion regulation.

Keywords:
intranasal light therapylow-level light therapynear-infrared laser transmissionnear-infrared radiationphotobiomodulationtranscranial light therapy

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Photomedicine

Background:

  • Major depressive disorder (MDD) involves emotional regulation deficits.
  • Transcranial photobiomodulation (t-PBM) shows promise for treating neuropsychiatric disorders.
  • Targeting prefrontal cortex regions is key for MDD treatment.

Purpose of the Study:

  • To investigate optimal light delivery methods for t-PBM in treating MDD.
  • To compare different illumination approaches and wavelengths for targeting dlPFC and vmPFC.
  • To inform the design of t-PBM systems for improved brain emotion regulation.

Main Methods:

  • Hardware-accelerated Monte Carlo simulations used to model light penetration in the brain.
  • Analysis of transcranial and intranasal illumination strategies.
  • Comparison of light energy deposition across various brain regions for wavelengths 670-1064 nm.

Main Results:

  • Transcranial illumination at F3-F4 effectively targets the dlPFC.
  • Intranasal or Fp1-FpZ-Fp2 transcranial illumination can reach the vmPFC.
  • 810 nm wavelength demonstrated the highest energy delivery to targeted regions.

Conclusions:

  • t-PBM offers a viable strategy for enhancing brain emotion regulation.
  • Specific non-invasive and minimally invasive t-PBM approaches can effectively target dlPFC and vmPFC.
  • The study provides foundational data for optimizing t-PBM device design for MDD treatment.