Electromagnetic Reflectance Measurements of Human Palms in Sub-THz Frequency Band

Electromagnetic (EM) reflectance measurements of human palms were made for 21 subjects in the frequency range of 426-432 GHz. This range is expected to lie in the vicinity of the axial mode of the coiled sweat ducts, which were triggered by varying levels of stress. The EM measurements were correlated to known indicators of stress and high levels of correlation were observed during mental stress. A paired Student's t-test also showed an intrinsic difference between the rest and mental stress sections. The observations are intriguing and require further inquiry.