1. A method of stimulating operation of associative powers of a subject person and evoking descriptive or narrative response from the subject comprising: (a) providing a plurality of different, discrete visual representations arrangeable in a matrix-like array comprising a base group of a plurality of said representations and a plurality of additional groups each of a plurality of different discrete visual representations, and said discrete visual representations in said base group displaying examples of the same concept in at least next adjacent discrete representations and showing a concept in sequence, and said discrete representations in said additional groups displaying no example of the same concept as a group but each said representation in each additional group displaying an example of the same concept as a discrete representation relative to at least one other additional group or said base group; (b) manually presenting first to the subject person said base group of discrete and different visual representations from said matrix with members of the base group arranged in a random order, in a format permitting the subject person to arrange the said representations as a first visible pattern sequence elected by the subject as a logical order, and in the said pattern, subsequently at least, to modify said pattern by substituting representations from said additional groups as presented to establish successive visible patterns; (c) requesting the subject person to arrange the base group representations in a logical order as a first visible pattern; (d) requesting the subject person to describe what he has done in establishing the pattern, or the significance of that pattern; (e) manually presenting to the subject, successsively in a predetermined order, said plurality of additional groups of discrete and different visual representations from the matrix, in a format permitting random presentation of the members in each successive additional group, and permitting to the subject at least elective substitution of members from each succeedingly presented group for a visual representation in a prevailing said visible pattern of visual representations, and with removal from the visual field of all unused members of each additionally presented group and of members removed from any previously established visible pattern, before presentation of a further group; (f) requesting the subject person to substitute members from the newly presented groups as presented for members in the prevailing pattern with which there is a logical connection, to establish a new pattern of discrete, visual representations; and when the subject has completed his effort at substitution to remove from view unused members of each additionally presented group and members from the preexisting pattern as a result of the substitution; and (g) requesting the subject to describe each new pattern of visual representations as determined on presentation of each new additional group of a plurality of discrete visual representations, a majority of all said representations being representations of natural persons, animals, or things.