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In order to answer this you must first understand the idea of perception Perception refers to the interpretation of what we take in through our senses in terms of optical illusions this means our eyes Optical illusions occur because our brains our trying to interpret what we see and make sense of the world around us Optical illusions simply trick our brains into seeing things which may or may not be real In order to make sense of the world our brains try to see patterns or shapes that we can easily recognise This principle is called grouping Our brains can group things into four types Similarity Proximity Continuity Closure Many cognitive psychologists hold that as we move about in the world we create a model of how the world works That is we sense the objective world but our sensations map to percepts and these percepts are provisional in the same sense that scientific hypotheses are provisional cf in the scientific method As we acquire new information our percepts shift Abraham Pais biography refers to the esemplastic nature of imagination In the case of visual perception some people can actually see the percept shift in their minds eye Others who are not picture thinkers may not necessarily perceive the shape-shifting as their world changes The esemplastic nature has been shown by experiment an ambiguous image has multiple interpretations on the perceptual levelJust as one object can give rise to multiple percepts so an object may fail to give rise to any percept at all if the percept has no grounding in a persons experience the person may literally not perceive it Unlike the structuralism view of perception that used a bottoms up approach by adding up the parts Gestalt stressed the importance of the whole as being more important that the sum of its parts We often hear the phrase The whole is often greater than the sum of individual
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