The author presents the analysis of a 23-year-old, obese, psychotic man who was dominated by sensations and unable to work through the different levels of psychic elaboration. He could not discriminate between words and concrete objects or between the perceptual functions of sense organs and the oral-cannibalistic level of instinct. Following the working through of these inabilities, it became possible to understand the patient's use of sensation and to make him aware of his emotions and conflicts. The author's discussion of this material emphasizes the role of the body-mind conflict and how this can be confronted in the analytic relationship. Possible links with neuroscience are also indicated.