The healthy brain enables vision through a complex process involving both hemispheres. First, certain receptors are activated in the retina, and information passes through the eye and visual pathways until it reaches the primary visual cortex, located at the back of the brain, where it becomes one single perception, which the parietal and temporal lobes then process. The parietal lobes provide the person with the “where and when” of the image, situating us in time and space. The temporal lobe supplies the “who, what, and why,” governing our ability to recognize names, feelings, and memories.
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