Riddoch M J, Humphreys G W
Department of Paramedical Sciences, North East London Polytechnic.
Brain. 1987 Dec;110 ( Pt 6):1431-62. doi: 10.1093/brain/110.6.1431.
A single case study of a patient with visual agnosia is presented. The patient had a marked impairment in visual object recognition along with good tactile object identification and a preserved ability to copy. Detailed investigations demonstrated impaired perceptual processes, with the patient's identification strongly affected by duration of stimulus exposure and by using overlapping figures. However, his stored knowledge of objects was shown to be intact. The results demonstrate that agnosia may be determined by a specific deficit in integrating form information; and that the input description for visual object recognition, disrupted in this patient, is functionally separate from stored object descriptions, which are intact. The implications of the results for understanding visual agnosia and for theories of normal visual object recognition are discussed.
本文呈现了一例视觉失认症患者的个案研究。该患者在视觉物体识别方面存在明显障碍，同时触觉物体识别能力良好且临摹能力保留。详细调查显示其感知过程受损，患者的识别受到刺激暴露持续时间和使用重叠图形的强烈影响。然而，他对物体的存储知识被证明是完整的。结果表明，失认症可能由整合形状信息的特定缺陷所决定；并且该患者中被破坏的视觉物体识别的输入描述在功能上与完整的存储物体描述是分开的。讨论了这些结果对理解视觉失认症以及正常视觉物体识别理论的意义。
