An optical illusion that at their ends. Lines with the commonly tricks the hu-arrowheads pointing inward man brain also seems to appear longer to the human fool horses, according to re- viewer, while those with ar-search from Italy. rowheads pointingoutward Optical illusions occur seem shorter. Previous stud-when the brain misinter- ies have shown that other pri-prets visual information, mates are also fooled by the causing a viewer's percep- illusion, but dogs are not. tion to differ from reality. For the study, 10 horses Researchers believe that if were first tested to see if they animals perceive illusions would consistently select the as people do, the mecha- longer of two otherwise iden-nisms that enable them to tical carrots. In these trials, discern the size, color and pieces of white plastic that shape of objects may be would later form arrowheads similar, too.
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