Abstract
It was predicted that, due to the optical distortion produced by wearing a face mask, the constancy of visual position would not be maintained underwater, i.e., stationary objects should appear to move when the head is moved. Ss rotated their heads about a vertical axis and made magnitude estimates of object movement in both air and water. Twice as much movement occurred in water as in air. Two underwater activities, head rotation while observing vertical stripes and practice in hand-eye coordination, produced a small reduction in the loss of position constancy.
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