| Summary: | In an article on binocular perspective, Verhoff (1925) made passing mention of his observation that if the centre of a bent line were viewed "steadily with one eye for a short time" and the eye then fixed on a straight line, the latter appeared bent in the opposite direction. Verhoff suggested that this effect might be due to “unconscious mental comparison” of the second line with the after-image of the first. Gibson (1933) found that Ss who had worn lenses which made verticals appear curved remarked, on removing the glasses, that verticals now appeared curved in the opposite direction.
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