1. Effects of decreased variation in the sensory environment.
2. Rose Homan Bolin , "An Investigation of Sensory Deprivation in Immobilized Orthopedic Patients," Unpublished Master's Thesis, University of Iowa, 1972 .
3. Charles A. Brownfield , Isolation: Clinical and Experimental Approaches , New York: Random House, 1965 , pp.126 -127 .
4. THE ENVIRONMENT OF THE INTENSIVE CARE UNIT