A method for estimating constancy during motion, described in a previous paper, is used to find the effect of proprioceptive information of O's movement on visual size constancy. Os were carried in darkness backward and forward on a swing, while their constancy was estimated. It was found that constancy was improved when Os received proprioceptive information of their movement. Constancy was greater for binocular than monocular viewing of the self-luminous display; and constancy was greater for forward than backward movement.
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