DISCUSSION: Dr. Charles Fisher commented that Dr. Silverman attempts to classify types of stimuli that make up the 'environmental condition' chiefly by whether they are subliminal or supraliminal, and to delineate real life analogues to laboratory subliminal manipulations. He suggested that the real life analogue of the laboratory subliminal stimulus is the naturally occurring subliminal stimulus rather than the supraliminal stimulus, the drive relevance of which is unconscious. He stated that there is no good laboratory analogue of the latter. The