The occipital The occipital lobes Occipital lobe - Mahidol University
The occipital The occipital lobes Occipital lobe - Mahidol University
The occipital The occipital lobes Occipital lobe - Mahidol University
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23/06/54Alexia• Alexia = inability to read– Alexia with agraphia• Sites of lesion: parieto‐temporal junction area,particularly the angular gyrus– Alexia without agraphia• Sites of lesion: dominant visual cortex and spleniumof the corpus callosum (posterior cerebral arterylesion)Agraphia = inability to write<strong>The</strong> <strong>Occipital</strong> Lobes Are the Center of OurVisual Perception System<strong>The</strong> Peristriate region of the <strong>occipital</strong> <strong>lobe</strong> isinvolved in visuospatial processing,discrimination of movement and colordiscrimination.Damage to one side of the <strong>occipital</strong> <strong>lobe</strong>causes homonymous loss of vision withexactly the same "field cut" in both eyes.Disorders of the <strong>Occipital</strong> Lobe Can CauseVisual Hallucinations and IllusionsVisual hallucinations (visual images withno external stimuli) can be caused bylesions to the <strong>occipital</strong> region or temporal<strong>lobe</strong> seizures.Visual illusions (distorted perceptions)can take the form of objects appearinglarger or smaller than they actually are,objects lacking color or objects havingabnormal coloring.Disorders of the <strong>Occipital</strong> Lobe Can CauseVisual Hallucinations and IllusionsLesions in the parietal-temporal<strong>occipital</strong>association area can causeword blindness with writingimpairments.NEUROPSYCHIATRY 11319
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