The Moon Illusion, II

Abstract
We have examined the two types of explanations of the moon illusion—the egocentric, in which the differences in direction of the horizon and the zenith moons are thought of in relation to different angles of regard of the observer, and the objective, in which the presence or absence of the terrain is considered crucial. The former type is exemplified chiefly by the eye-elevation hypothesis in the work of Boring and his colleagues; the latter, by the apparent-distance hypothesis based on the superior cues to distance provided by the terrain. Boring had rejected the apparent-distance hypothesis on the grounds that the horizon moon is reported as nearer, not farther away, by most observers. He then performed experiments which supported the eye-elevation hypothesis.

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