Size constancy and emmert's law of apparent sizes

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Abstract
Boring asserted that Emmert's law of the apparent size of after‐images held only under conditions of size constancy. In Phase I of the present experiment 28 male Ss made paired‐comparisons judgments of the afterimage size and of the distance of the projection field at 7 distances ranging from 18 to 126 in. In Phase II, 14 male Ss made similar size and distance estimates using direct‐images which subtended the same retinal angle as that subtended by the after‐image inducing stimulus. Although size constancy obtained, the paired‐comparisons scale for apparent afterimage size showed Emmert's law to fail as distance increased beyond 90 in.

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