The occipital The occipital lobes Occipital lobe - Mahidol University

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23/06/54Color agnosiaA defect of color recognition which has avariety of forms, primarily an inability toname or discriminate between colors.The color name may be given in a qualified orconcrete form or a confabulation may occur.It sometimes accompanies alexia and aphasia.Usually results from a left occipital or occipitotemporallesion.Color agnosia (cont)It sometimes accompanies alexia andaphasia.Usually results from a left occipital oroccipitotemporal p lesion.NEUROPSYCHIATRY 139NEUROPSYCHIATRY 140Color agnosia (cont)Test:Matching names to colors and colorsto names, color sorting, arrangingshades of a color by intensity, coloringpictures appropriately,identificationof inappropriatelycolored objects.SimultanagnosiaThe inability to absorb more than one objector aspect of a visual stimulus at a time.This condition occurs with bilateral lesionsof the occipitoparietal region.When accompanied by incoordination ofocular movements, this defect is known asBalint's syndrome.NEUROPSYCHIATRY 141NEUROPSYCHIATRY 142Simultanagnosia (cont)TestHave patient attempt to draw a linearound shapes (circle, square,triangle),or write with eyes open, thenclosed (with Balint's syndrome, closingeyes improves handwriting)MetamorphopsiaObjects are correctly recognized but aresubjectively distorted.Lesions of the occipital lobe produce simplerdeficits, while parietal lesions tend toproduce intermediate effects, , and temporallesions are associated with more complexdisorders.Teleopsia objects appear small and at adistance.NEUROPSYCHIATRY 143NEUROPSYCHIATRY 14424
23/06/54Metamorphopsia (cont)Teleopsia objects appear small and at adistancePelopsia objects appear to loom up close.Loss of stereoscopic vision.Palinopsia (paliopsia) -- perseveratoryillusions which are superimposed uponobjects currently in the visual field. Thisdefect usually occurs in the presence of aright occipitotemporal lesion.Metamorphopsia (cont)TestAssess qualitative visual changes viapatient report and tasks tapping visualdisorientation, i ti inattention, ti fluctuation,tidelayed recognition of forms, imperfectsynthesis of moving objects, and alteredrate of flicker-fusion.NEUROPSYCHIATRY 145NEUROPSYCHIATRY 146D. Integrative FunctionNEUROPSYCHIATRY 147NEUROPSYCHIATRY 148OpticKinesthetic motor organization. Sincemovement entails a number of systems, itis necessary to check all components of themovement function in assessing a dfiit deficitIntegrity of the visual-spatial basis ofmovement.Impairment of this component is due to alesionin the inferior parietal and/orparietoccipital region, especially on theright.Test -- have patient reproduce theexaminer's hand and pencil movementswith examiner sitting beside, thenopposite, the patientNEUROPSYCHIATRY 149NEUROPSYCHIATRY 15025
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Page 17 and 18: 23/06/54Occipital lobe epilepsy•
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The occipital The occipital lobes Occipital lobe - Mahidol University

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