In studies on sensory deprivation three sets of variables are involved relating to the structure of the experimental situation, the subject, and the interaction of observer and subject. Seven subjects were interviewed, subjected to an eight-hour period of isolation, and reinterviewed. Although marked perceptual distortions and imagery were noted, these were not correlated with clinical evaluation of 'ego integrity'. Imagery was more frequent in those disposed to hypnagogic imagery; the less-integrated subjects tended to interact with their imagery in a more emotional way. Subjects respond to the deprivation situation with characteristic adaptive and defensive patterns. The authors believe that limitation of touch and proprioception, as well as of visual patterning, is necessary for imagery in these situations. Further investigation of the relationship of imagery and personality is suggested.