The possible value of monocular motion parallax for improving distance perception underwater was investigated. Submerged Ss either kept their heads stationary or rotated their heads about a vertical axis while judging the distance of objects placed 4 to 15 ft. away. Both before and after training with feedback to increase accuracy of judgment, head movement did not significantly improve performance. Water turbidity and loss of position constancy are two probable reasons for the failure to replicate the positive results previously obtained in air.
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