
Cognition
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The Brain &/or Psyche
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Perception (from the Latin perceptio, percipio ) is the organization, identification and interpretation of sensory information in order to represent and understand the environment. [ 1 ] All perception involves signals in the nervous system , which in turn result from physical stimulation of the sense organs. [ 2 ] For example, vision involves light striking the retinas of the eyes, smell is mediated by odor molecules and hearing involves pressure waves . Perception is not the passive receipt of these signals, but can be shaped by learning , memory and expectation . [ 3 ] [ 4 ] Perception involves these "top-down" effects as well as the "bottom-up" process of processing sensory input. [ 4 ] The "bottom-up" processing is basically low-level information that's used to build up higher-level information (i.e. - shapes for object recognition). The "top-down" processing refers to a person's concept and expectations (knowledge) that influence perception.
Perception
The human mind is a wonderful thing. Cognition, the act or process of thinking, enables us to process vast amounts of information quickly.
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Gestalt theory first arose in 1890 as a reaction to the prevalent psychological theory of the time - atomism. Atomism examined parts of things with the idea that these parts could then be put back together to make wholes. Atomists believed the nature of things to be absolute and not dependent on context. Gestalt theorists, on the other hand, were intrigued by the way our mind perceives wholes out of incomplete elements [ 1 , 2 ]. "To the Gestaltists, things are affected by where they are and by what surrounds them...so that things are better described as "more than the sum of their parts."" [ 1 , p. 49].

