Changes in perceptual function after isolation.

IN AN EARLIER preliminary report (4) we desribed some of the gross effects of perceptual isolation on visual perception, based on the subjective reports of three sophisticated subjects. In the present paper we provide data from a systematically administered battery of objective tests of visual perception given to thirteen subjects after four days of isolation, and data from a series of tests of somaesthetic perception and spatial orientation. In addition, we include results from a group of ambulatory subjects who underwent visual isolation, but were not restricted in any other way.