The invention provides an apparatus and method for identifying individuals based upon patterns of physiological activity generated in the brain and for distinguishing between normal and impaired brain states in any particular individual. These patterns may be obtained by directly or indirectly recording...http://www.google.com.au/patents/US5325862?utm_source=gb-gplus-sharePatent US5325862 - Method and/or system for personal identification and impairment assessment from brain activity patterns
