Three hypotheses were tested. (1) Response-produced visual stimuli (RPVS) would yield smaller errors of distance judgments of arm length, a natural unit, than non-RPVS. (2) Errors of judgments of distance in a natural unit would be smaller than those in arbitrary units. (3) Effects of development, if any, would be greatest for judgments of distance in an unnatural unit and judgments based on non-RPVS. The first two hypotheses remained tenable while the third did not.
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