Each of 60 male Ss made 20 judgments of the postural vertical in the absence of visual cues. 10 Ss were randomly assigned to each of the 6 experimental conditions defined by left or right lateral tilt in a prone, supine, or sitting body position. In all conditions Ss consistently underestimated the postural vertical. Significantly larger errors were made by Ss tilted in the sitting position than by Ss tilted in the prone or supine positions. Performance in the prone and supine positions did not differ. No differences were obtained between tilting in the left and right quadrants for any of the body positions. Practice led to a significant decrease in error under all conditions.
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