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We gain information about the world through many senses simultaneously, and part of the information we gain is available through more than one sense. Imagine holding a lemon in your hands and gently exploring it. You both see and feel the shape of the lemon as well as its nubbled texture. If you squeeze the lemon, you feel its resistance and see its shape deform. These kinds of information are available both visually and haptically (through touch). Other senses can participate as well. If we scratch the lemon, we sense its pungent odor. If we drop it, we hear its impact with the floor. The perceptual system combines disparate sources of information into a unified picture of the environment around us. This entry is primarily ...

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