... perceptual set. Perceptual set is a non-intentional mental predisposition that influences how we perceive visual and non-visual information. When a person is given only partial data their brain fills in what it expects the missing information to be.With visual illusions, there is more than one way to view the same image, and our vision will flicker between them, provided that we are able to see both forms of the image. Bugelski and Alampay (1961) did an experiment in which they showed people an image which could either be perceived as a rat or as an old man wearing glasses. Before the participants where shown this image, they were shown either images of human faces or images of animals: Since the participants were either expecting to see another face or another animal, their perception was changed, and consequently 100% of the animal group saw a rat in the last image and between ...

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