brain by amplifying brainwave signals it was possible for these subjects to conduct a binary digit system of communications under experimental conditions dewan 39 s preliminary results were documented in nature vol 214 p 975 is an article entitled u201c occipital alpha rhythm eye position and lens accommodation u201d 1967 which is incorporated by reference his principles are put into application here the reader 39 s attention is now directed towards fig1 which depicts a biofeedback sensor system which is worn on the head via a strap hb 1 and uses two sensors sn to detect the emission of alpha waves and drive a communication system or servomechanism 100 fig1 is a perspective view of a two electrode implementation conductive standard eeg electrodes e 1 and e 3 are sewn inside headband hb 1 electrodes e 1 and e 3 are applied in the usual way with electrode paste and contact the user 39 s scalp across the occipital lobes and pick up signals from this area of the brain electrodes e 1 and e 3 are connected via snaps sn to electronics servomechanism communication system 100 in the ear audio biofeedback transducer sk is hard wired to servomechanism 100 servomechanism 100 connects to sense electrodes e 1 and e 3 which contact the scalp across the back of the head over the occipital lobe via snaps sn headband hb 1 is free to slide back and forth through loop shaped.