Sixty years ago, scientists were trying to regrow hair on rats using red and near-infrared light. What they found instead changed the future of brain therapy.

Erinn Askin explains how transcranial photobiomodulation was accidentally discovered when researchers noticed decreased ADHD-like symptoms in the rats they were studying, and how the field has grown from there. She also breaks down BDNF (brain-derived neurotrophic factor).

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