“…In 1883, Sir Francis Galton conducted the first and still referenced study of mental imagery which concerned individual differ ences in vividness of imagery. Imagery remained an important part of early psychology until the beginning of the 1900's and the advent of behaviorism (Boring, 1942;Hebb, 1960;Horowitz, 1972;Kessel, 1972;Leibovitz, London, Cooper, & Hart, 1972;McKellar, 1973;McMahon, 1973).…”