1. A method of assessing psychobiological responses to verbal stimuli, the responses being in the form of evoked potentials obtained from a subject's scalp, the method comprising the steps of: selecting a first verbal input formed of a first group of words, each group having a pleasant connotation; selecting a second verbal input formed of a second group of words, each word having an unpleasant connotation; selecting a third verbal input formed of a third group of words, each word having a connotation relating to a diagnosed conscious pathological condition of the subject; selecting a fourth verbal input formed of a fourth group of words, each word having a connotation related to a diagnosed unconscious pathological condition of the subject; subliminally stimulating the subject using at least selected ones said first, second, third, and fourth groups of words; supraliminally stimulating the subject using at least selected ones of said first, second, third, and fourth groups of words; collecting the responses resulting from said steps of subliminally stimulating and supraliminally stimulating; and analyzing mathematically said collected responses using transinformation techniques for producing at least one probabilistic value corresponding to an amount of information in the responses.