Brent P J, Kennard C, Ruddock K H
Department of Neuroscience, Charing Cross Hospital and Westminster Medical School, London, U.K.
Proc Biol Sci. 1994 Jun 22;256(1347):219-25. doi: 10.1098/rspb.1994.0073.
We present data for a patient, GY, with a right hemianopia caused by traumatic damage to the left occipital cortex. Previous studies have established that this patient has residual vision which enables him to detect and localize transient stimuli presented to his 'blind' hemifield. We have now examined spectral responses associated with this residual vision by using two-colour incremental threshold methods to measure II-spectral functions, and a white light background to examine spectral data for 'colour-opponent' characteristics. We report that both methods yield normal spectral response characteristics for GY's 'blind' hemifield. We have also investigated the patient's ability to identify, verbally, coloured stimuli presented to his 'blind' hemifield, and found that, in 'forced choice' experiments, he achieves a high proportion of correct responses to large stimuli. The patient reported that in threshold detection measurements his responses were based on the presence or absence of a percept associated with transient light stimulation of the 'blind' hemifield (residual vision), whereas colour naming was achieved without conscious perception of colour ('blindsight').
我们展示了患者GY的数据，其因左侧枕叶皮质创伤性损伤导致右侧偏盲。先前的研究已证实，该患者存在残余视力，这使他能够检测并定位呈现于其“盲”半视野的短暂刺激。我们现在通过使用双色递增阈值法测量II光谱函数，并利用白色光背景来检测“颜色拮抗”特征的光谱数据，研究了与这种残余视力相关的光谱反应。我们报告称，这两种方法均得出了GY“盲”半视野的正常光谱反应特征。我们还研究了该患者口头识别呈现于其“盲”半视野的有色刺激的能力，发现在“强制选择”实验中，他对大刺激的正确反应比例很高。该患者报告称，在阈值检测测量中，他的反应基于与“盲”半视野（残余视力）短暂光刺激相关的感知的存在或缺失，而颜色命名是在没有对颜色的有意识感知（“盲视”）的情况下完成的。
