BACKGROUND Simultanagnosia is a neurological disorder that impairs an individual's ability to perceive more than one object at a time visually.While the individual may acknowledge the presence of multiple objects ...BACKGROUND Simultanagnosia is a neurological disorder that impairs an individual's ability to perceive more than one object at a time visually.While the individual may acknowledge the presence of multiple objects in his field of view,he cannot generally summarize the overall percept.CASE SUMMARY We describe a case of simultanagnosia in Posterior Cortical Atrophy,evidenced by the Ishihara color test.A 54-year-old woman complained of reading problems despite normal visual acuity and a structural eye exam.The patient failed to identify any of the Ishihara color plates in either eye despite adequate naming of colors.Automated visual field testing showed a homonymous hemianopia.Structural and functional neuroimaging and cerebrospinal fluid analysis were consistent with posterior cortical atrophy.CONCLUSION Simultanagnosia can be tested with the Ishihara pseudoisochromatic plates because the recognition of embedded number patterns in the test requires appreciation of a collection of individual stimuli.展开更多
通过测定雅氏山蝉(L ep top sa lta yam ash ita i(E sak i and Ish ihara),com b.nov.)若虫头壳宽度的方法,对雅氏山蝉若虫龄期划分进行了研究。采用标准地调查法,用频次比较法拟合,初步得出雅氏山蝉若虫共4龄。用若虫龄级与头宽均值...通过测定雅氏山蝉(L ep top sa lta yam ash ita i(E sak i and Ish ihara),com b.nov.)若虫头壳宽度的方法,对雅氏山蝉若虫龄期划分进行了研究。采用标准地调查法,用频次比较法拟合,初步得出雅氏山蝉若虫共4龄。用若虫龄级与头宽均值回归进行检验,证实了该蝉若虫共4龄。展开更多
文摘BACKGROUND Simultanagnosia is a neurological disorder that impairs an individual's ability to perceive more than one object at a time visually.While the individual may acknowledge the presence of multiple objects in his field of view,he cannot generally summarize the overall percept.CASE SUMMARY We describe a case of simultanagnosia in Posterior Cortical Atrophy,evidenced by the Ishihara color test.A 54-year-old woman complained of reading problems despite normal visual acuity and a structural eye exam.The patient failed to identify any of the Ishihara color plates in either eye despite adequate naming of colors.Automated visual field testing showed a homonymous hemianopia.Structural and functional neuroimaging and cerebrospinal fluid analysis were consistent with posterior cortical atrophy.CONCLUSION Simultanagnosia can be tested with the Ishihara pseudoisochromatic plates because the recognition of embedded number patterns in the test requires appreciation of a collection of individual stimuli.
文摘通过测定雅氏山蝉(L ep top sa lta yam ash ita i(E sak i and Ish ihara),com b.nov.)若虫头壳宽度的方法,对雅氏山蝉若虫龄期划分进行了研究。采用标准地调查法,用频次比较法拟合,初步得出雅氏山蝉若虫共4龄。用若虫龄级与头宽均值回归进行检验,证实了该蝉若虫共4龄。
