Abstract
Hemispheric effects for mental rotation were assessed with letters and polygons presented in their normal or mirror-image form at various degrees of rotation from upright to the center, left, and right visual fields. Mean reaction times and error rates for center-field processing were shorter than for those for either the left or right visual-field presentations. No evidence was found of any hemispheric differences for either the letter (verbal) or polygon (spatial) stimuli. These results suggest that the cognitive processes underlying mental rotation are not hemisphere-specific.
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