Differential impact of parvocellular and magnocellular pathways on visual impairment in apperceptive agnosia? Export

@article{citeulike:3397534, abstract = {The term "visual form agnosia" describes a disorder characterized by problems recognizing objects, poor copying,and distinguishing between simple geometric shapes despite normal intellectual abilities. Visual agnosia has been interpreted as a disorder of the magnocellular visual system, caused by an inability to separate figure from ground by sampling information from extended regions of space and to integrate it with fine-grain local information. However,this interpretation has hardly been tested with neuropsychological or functional brain imaging methods, mainly because the magnocellular and parvocellular structures are highly interconnected in the visual system.We studied a patient (AM) who had suffered a sudden heart arrest, causing hypoxic brain damage. He was/is severely agnosic, as apparent in both the Birmingham Object Recognition Battery and the Visual Object and Space Battery. First- and especially second-order motion perception was also impaired, but AM experienced no problems in grasping and navigating through space. The patient revealed a normal P100 in visual evoked potentials both with colored and fine-grained achromatic checkerboards. But the amplitude of the P100 was clearly decreased if a coarse achromatic checkerboard was presented.The physiological and neuropsychological findings indicate that AM experienced problems integrating information over extended regions of space and in detecting second-order motion. This may be interpreted as a disorder of the magnocellular system, with intact parvocellular system and therefore preserved ability to detect both local features and colors.}, author = {Hildebrandt, H. and Sch\"{u}tze, C. and Ebke, M. and Spang, K.}, citeulike-article-id = {3397534}, citeulike-linkout-0 = {http://dx.doi.org/10.1080/13554790490495168}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/15788258}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=15788258}, doi = {10.1080/13554790490495168}, issn = {1355-4794}, journal = {Neurocase : case studies in neuropsychology, neuropsychiatry, and behavioural neurology}, keywords = {agnosia, and, apperceptive, differential, impact, impairment, in, magnocellular, of, on, parvocellular, pathways, visual}, month = {June}, number = {3}, pages = {207--214}, posted-at = {2008-10-12 07:10:20}, priority = {2}, title = {Differential impact of parvocellular and magnocellular pathways on visual impairment in apperceptive agnosia?}, url = {http://dx.doi.org/10.1080/13554790490495168}, volume = {10}, year = {2004} }

TY - JOUR ID - citeulike:3397534 L3 - citeulike-article-id:3397534 N2 - The term "visual form agnosia" describes a disorder characterized by problems recognizing objects, poor copying,and distinguishing between simple geometric shapes despite normal intellectual abilities. Visual agnosia has been interpreted as a disorder of the magnocellular visual system, caused by an inability to separate figure from ground by sampling information from extended regions of space and to integrate it with fine-grain local information. However,this interpretation has hardly been tested with neuropsychological or functional brain imaging methods, mainly because the magnocellular and parvocellular structures are highly interconnected in the visual system.We studied a patient (AM) who had suffered a sudden heart arrest, causing hypoxic brain damage. He was/is severely agnosic, as apparent in both the Birmingham Object Recognition Battery and the Visual Object and Space Battery. First- and especially second-order motion perception was also impaired, but AM experienced no problems in grasping and navigating through space. The patient revealed a normal P100 in visual evoked potentials both with colored and fine-grained achromatic checkerboards. But the amplitude of the P100 was clearly decreased if a coarse achromatic checkerboard was presented.The physiological and neuropsychological findings indicate that AM experienced problems integrating information over extended regions of space and in detecting second-order motion. This may be interpreted as a disorder of the magnocellular system, with intact parvocellular system and therefore preserved ability to detect both local features and colors. IS - 3 JF - Neurocase : case studies in neuropsychology, neuropsychiatry, and behavioural neurology SN - 1355-4794 EP - 214 TI - Differential impact of parvocellular and magnocellular pathways on visual impairment in apperceptive agnosia? VL - 10 SP - 207 KW - agnosia KW - and KW - apperceptive KW - differential KW - impact KW - impairment KW - in KW - magnocellular KW - of KW - on KW - parvocellular KW - pathways KW - visual AU - Hildebrandt, H AU - Schütze, C AU - Ebke, M AU - Spang, K PY - 2004/06// UR - http://dx.doi.org/10.1080/13554790490495168 ER -