Rosenstock assumes that the defense mechanism of repression is manifested in perceptual behavior. He hypothesizes that under a sufficiently low degree of illumination, repressible material would not be perceived. 'The experimental material consisted of sentences describing sexual and aggressive attitudes toward parents. A series of control sentences avoided sexual or aggressive connotations. The results showed that the experimental sentences were more difficult to see (under low illumination levels) than the neutral sentences and the former were more easily and frequently distorted. Women found it more difficult to recognize the aggressive material, while men experienced more difficulty in the sexual material.' The author suggests a possible formulation of the dynamics of repression in terms congenial to Gestalt psychological concepts.