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Visual illusions involve experiences of perceiving visual stimuli in ways that do not align with reality. These illusions take many forms, including illusions of numerosity, movement, and size. These illusions as experienced by humans are often also experienced by nonhuman animals. The comparative perspective on visual illusions has provided a wealth of information about how visual processing works across species, highlighting potentially conserved and evolutionarily ancient mechanisms that represent the visual world incorrectly. These illusions are valuable also as a means to understanding how visual perception works.
- Parrish, A. E., Brosnan, S. F., & Beran, M. J. (2015). Do you see what I see? A comparative investigation of the Delboeuf illusion in humans (Homo sapiens), rhesus monkeys (Macaca mulatta), and capuchin monkeys (Cebus apella). Journal of Experimental Psychology: Animal Learning and Cognition, 41, 395–405.Google Scholar