This was a study of the effect of prolonged maintenance of a rotated head position on the apparent frontal plane, as determined by using a rotating-plane apparatus, Measurements of the apparent frontal plane were obtained before and after a forty-five minute adaptation period in which the subject's head was restrained in a rotated position, by means of a surgical collar. Stereoscopic information was withheld during this time by covering the dominant eye with a white patch. In both test and re-test conditions the plane of the subject's face was congruent with the frontal plane of his body, Results showed that relative to the "before" settings the apparent frontal plane was rotated toward the subject on the side toward which his head had been rotated.
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