Mental rotation is the ability to rotate mental representations of two-dimensional and three-dimensional objects. The ability is somewhat localized to the right cerebral hemisphere, largely in the same areas as perception, and is associated with spatial processing and general intelligence but not verbal skills.
Mental rotation is the brain moving objects in order to understand what they are and where they belong. It has been studied to try to figure out how the mind recognizes objects in the environment. Researchers call these objects stimuli. A stimulus then would be any object or image seen in the person’s environment that has been altered in some way. Mental rotation then takes place for the person to figure out what the altered object is.
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The Daily Omnivore 