HOWARD SHEVRIN, PHD
Psychologist at Commonwealth, Ann Arbor, MI

4699153, Oct 13, 1987

Apr 23, 1985

6/726056

Howard Shevrin - Ann Arbor MI
William J. Williams - Ann Arbor MI
Robert E. Marshall - Ann Arbor MI

The University of Michigan - Ann Arbor MI

A61B 504

128731

A system for assessing psychobiological conditions of a subject utilizes a plurality of words which are selected to be in four categories as critical stimuli. The words are presented by a tachistoscope to the subject in subliminal and supraliminal modes of operation. Subliminal stimulation of the subject is achieved by presenting the selected words for an exposure period of approximately one millisecond. The supraliminal exposure time is approximately thirty milliseconds. Prior to stimulation, the subject is diagnosed in accordance with conventional psychoanalytical techniques to establish the presence and nature of a pathological condition. The words are selected and categorized in four groups: pleasant words, unpleasant words, words related to a diagnosed conscious pathological condition, and words related to a diagnosed unconscious pathological condition. The brain wave responses which are evoked by the stimulation are collected via electrodes and analyzed in accordance with a transinformation technique which is based on information signal theory for establishing a probabilistic value which corresponds to the information content of the evoked responses.