10 : Electroencephalography (EEG) device for monitoring, measuring and interpreting brain activity for medical diagnostic and medical research purposes; Electronic or electric devices which monitor internal or external electric activity from the brain, namely, EEG (Electroencephalogram) machines, MEG (Magnetoencephalogram) machines, MRI (magnetic Resonance Imaging) machines, fMRI (functional Magnetic Resonance Imaging) machines, EMG (electromyogram) machines, EOG (electrooculogram) machines, PET (Positron Emission Tomography) machines, actigraphy machines, X-ray CT (Computed Tomography) scanners, and piezoelectric sensors in the nature of a piezoelectric head-mounted brain scanner which senses acoustic signals generated from pulsing blood flow, all of the foregoing goods for medical purposes; a brain scanning system for medical purposes, comprising one or more sensors, one or more electronic receivers