Nijboer Tanja C W, Nys Gudrun M S, van der Smagt Maarten J, de Haan Edward H F
Department of Experimental Psychology, Helmholtz Institute, Utrecht University, The Netherlands.
Cortex. 2009 Jul-Aug;45(7):816-24. doi: 10.1016/j.cortex.2008.12.007. Epub 2009 Jan 31.
We report a patient with extensive brain damage in the right hemisphere who demonstrated a severe impairment in the appreciation of brightness. Acuity, contrast sensitivity as well as luminance discrimination were normal, suggesting her brightness impairment is not a mere consequence of low-level sensory impairments. The patient was not able to indicate the darker or the lighter of two grey squares, even though she was able to see that they differed. In addition, she could not indicate whether the lights in a room were switched on or off, nor was she able to differentiate between normal greyscale images and inverted greyscale images. As the patient recognised objects, colours, and shapes correctly, the impairment is specific for brightness. As low-level, sensory processing is normal, this specific deficit in the recognition and appreciation of brightness appears to be of a higher, cognitive level, the level of semantic knowledge. This appears to be the first report of 'brightness agnosia'.
我们报告了一名右半球广泛脑损伤的患者，该患者在亮度感知方面表现出严重受损。视力、对比敏感度以及亮度辨别能力均正常，这表明她的亮度损伤并非仅仅是低水平感觉损伤的结果。尽管患者能够看出两个灰色方块不同，但她无法指出哪个更暗或更亮。此外，她无法判断房间里的灯是开着还是关着，也无法区分正常灰度图像和反转灰度图像。由于患者能够正确识别物体、颜色和形状，所以这种损伤是特定于亮度的。由于低水平的感觉处理是正常的，这种在亮度识别和感知方面的特定缺陷似乎处于更高的认知水平，即语义知识水平。这似乎是关于“亮度失认症”的首例报告。
