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(a) A picture of experimental setup showing (1) two fiber bundles for tPBM/sham light delivery (source) and detection (detector) on a human forehead and (2) circular area on the forehead under 4‐cm‐diameter laser illumination. Note that the laser aperture shown is more than 2 cm away from the forehead to show a clear illumination spot/area. (b) Experimental protocol of interleaved measurements. tPBM, transcranial photobiomodulation.
