Can pulsing light on the scalp boost brain performance?

This trial explores whether shining low-level light on the scalp—a technique called transcranial photobiomodulation—can change brain activity and improve fine motor skills like finger tapping. Twenty healthy young adults will receive different light pulse frequencies (continuous, 10 Hz, 40 Hz, 100 Hz) and a sham control, with a week between sessions. Researchers will measure brain excitability using transcranial magnetic stimulation and assess motor speed and dexterity. The goal is to see if specific frequencies have distinct effects on brain function.