Riddoch M Jane, Humphreys Glyn W, Akhtar Nabeela, Allen Harriet, Bracewell R Martyn, Schofield Andrew J
School of Psychology, University of Birmingham, Birmingham, UK.
Cogn Neuropsychol. 2008 Feb;25(1):56-92. doi: 10.1080/02643290701848901.
The performance of two patients with visual agnosia was compared across a number of tests examining visual processing. The patients were distinguished by having dorsal and medial ventral extrastriate lesions. While inanimate objects were disadvantaged for the patient with a dorsal extrastriate lesion, animate items are disadvantaged for the patient with the medial ventral extrastriate lesion. The patients also showed contrasting patterns of performance on the Navon Test: The patient with a dorsal extrastriate lesion demonstrated a local bias while the patient with a medial ventral extrastriate lesion had a global bias. We propose that the dorsal and medial ventral visual pathways may be characterized at an extrastriate level by differences in local relative to more global visual processing and that this can link to visually based category-specific deficits in processing.
对两名患有视觉失认症的患者在多项视觉处理测试中的表现进行了比较。这两名患者的区别在于背侧和内侧腹侧纹外区有病变。对于患有背侧纹外区病变的患者，无生命物体处于劣势，而对于患有内侧腹侧纹外区病变的患者，有生命物体处于劣势。这两名患者在纳冯测试中的表现模式也形成了对比：患有背侧纹外区病变的患者表现出局部偏向，而患有内侧腹侧纹外区病变的患者则表现出整体偏向。我们提出，背侧和内侧腹侧视觉通路在纹外水平上可能以局部视觉处理与更整体视觉处理的差异为特征，并且这可能与基于视觉的特定类别处理缺陷相关联。
