Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient
Seeing without Seeing? Degraded Conscious Vision in a Blindsight Patient
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DOI：
10.1371/journal.pone.0003028
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发表时间：
2008-08-21
期刊：
影响因子：
3.7
通讯作者：
Cleeremans, Axel
中科院分区：
文献类型：
--
作者：
Overgaard, Morten;Fehl, Katrin;Cleeremans, Axel
失明患者，其初级视觉皮层受损，表现出保留的能力，以区分视觉刺激呈现在他们的“盲”的领域，但没有报告的视觉意识。失明通常是在对单个患者的实验研究中进行的，因为很少有患者被诊断为“失明”。在我们对GR患者的单一病例研究中，我们询问盲视最好描述为无意识视力，还是有意识但严重退化的视力。在实验1和2中，我们成功地复制了以前关于盲视的研究的典型结果。然而，第三个实验表明，GR区分视觉刺激的能力并不反映无意识的视觉，而是退化的，但有意识的视觉。由于我们的发现是使用一种以前未在盲视研究中使用的方法获得主观报告的结果（但在健康受试者和其他脑损伤患者的研究中得到了验证），我们的结果要求重新考虑盲视，并且可以说也是许多以前对健康受试者无意识感知的研究。
Blindsight patients, whose primary visual cortex is lesioned, exhibit preserved ability to discriminate visual stimuli presented in their "blind'' field, yet report no visual awareness hereof. Blindsight is generally studied in experimental investigations of single patients, as very few patients have been given this "diagnosis''. In our single case study of patient GR, we ask whether blindsight is best described as unconscious vision, or rather as conscious, yet severely degraded vision. In experiment 1 and 2, we successfully replicate the typical findings of previous studies on blindsight. The third experiment, however, suggests that GR's ability to discriminate amongst visual stimuli does not reflect unconscious vision, but rather degraded, yet conscious vision. As our finding results from using a method for obtaining subjective reports that has not previously used in blindsight studies (but validated in studies of healthy subjects and other patients with brain injury), our results call for a reconsideration of blindsight, and, arguably also of many previous studies of unconscious perception in healthy subjects.