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Klopfer, Dale; Doherty, Michael E. – Teaching of Psychology, 1992
Describes a perceptual illusion, the Janus mask, for use in introductory psychology demonstrations. Suggests using a motor or videotaped image to rotate the mask, giving the impression that the mask is following a moving observer or oscillating. Recommends the illusion to show that perception is usefully conceptualized as hypothesis testing. (DK)
Descriptors: Demonstrations (Educational), Experiments, Higher Education, Introductory Courses