Perceived length depends on exposure duration: Straight lines and Muller-Lyer stimuli.

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Abstract
In 2 experiments with a total of 53 undergraduates, brief exposure reduced the apparent length of a straight line. Thereafter, apparent length increased linearly with log exposure duration. The perceived length of 2 parts of the Muller-Lyer illusion was also measured. The apparent length of the tails-inward Muller-Lyer figure increased with duration; the apparent length of the tails-outward figure was unaffected by duration. This is further evidence that the Muller-Lyer illusion consists of 2 functionally different component illusions. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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