Apparatus for enabling severely paralyzed people to communicate with others, namely, light-emitting diodes connected to headbands, photodiode detectors that emit near-infrared rays to detect brain activity and blood volume changes, electrical controllers, USB cables, and computer software available on CD-ROMs and DVDs used to measure brain activity

'activ':30,53 'apparatus':1 'avail':42 'blood':32 'brain':29,52 'cabl':38 'cd':45 'cd-rom':44 'chang':34 'communic':8 'comput':40 'connect':16 'control':36 'detect':28 'detector':20 'diod':15 'dvds':48 'electr':35 'emit':14,22 'enabl':3 'headband':18 'infrar':25 'light':13 'light-emit':12 'measur':51 'name':11 'near':24 'near-infrar':23 'other':10 'paralyz':5 'peopl':6 'photodiod':19 'ray':26 'rom':46 'sever':4 'softwar':41 'usb':37 'use':49 'volum':33

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