This study was concerned wiht the manner ih which perceived depth and perceived frontoparallel size varied with phusical distance and hence with each other.An equation expressing the the relation between perceived sizen and physical depth was developed and applied to size judgments determined with four observers under tow viewing conditions.By use of that equa- tion and an expression of the size-distance invariance hy- pothesis, and additional equation was deveoped which related perceived and ph,A.sic&l depthoThe additional equation,when ap- plied to judgments of perceived depth from the same obeervers under the same viewing conditions-produced result not in agreement with those expected from the size-distance invariance hypothesisoThis is interpreted as evidence against the validity of the size-distance invariance hypotheeis in its ususal f.rmo ihe data from the apparent depth judgments also were applied to the problem of the discrepancies in results that have been found
Abstract