Sahraie A, Weiskrantz L, Trevethan C T, Cruce R, Murray A D
Vision Research Laboratories, Department of Psychology, University of Aberdeen, Aberdeen AB24 2UB, UK,
Exp Brain Res. 2002 Mar;143(2):249-56. doi: 10.1007/s00221-001-0989-1. Epub 2002 Feb 2.
To date no systematic method has been used for characterising the residual capacity of blindsight subjects that would allow comparison and generalisation across all subjects. The detection of isoluminant gratings of varying spatial and temporal frequencies commends itself for detailed between-subject comparison, and for mapping results onto physiological properties in relation to neuronal circuitry. We report the ability of a blindsight subject (CS) to detect suprathreshold sine-wave gratings over a range of spatial and temporal frequencies using psychophysical techniques. A band-pass spatial channel with an upper cutoff below 3.5 cycles/deg is specified. The data also have been analysed to compare differences between two types of blindsight performances, type I and type II. Spatial gratings were also used to elicit a pupillary grating response, offering an objective method that is free of verbal nuances and response bias, and the resulting band-pass channel can be used both for clinical screening and for prediction and comparisons with psychophysical profiles. Finally, we have compared our results with those reported in studies of a well-known subject, GY, which demonstrate remarkable similarities. Implications are discussed in relation to blindsight research.
迄今为止，尚未采用系统的方法来表征盲视受试者的残余能力，以便在所有受试者之间进行比较和归纳。检测不同空间和时间频率的等亮度光栅，有利于进行详细的受试者间比较，并将结果映射到与神经回路相关的生理特性上。我们报告了一名盲视受试者（CS）使用心理物理学技术在一系列空间和时间频率上检测阈上正弦波光栅的能力。确定了一个上限截止频率低于3.5周/度的带通空间通道。还对数据进行了分析，以比较I型和II型两种盲视表现之间的差异。空间光栅也被用于引发瞳孔光栅反应，提供了一种不受语言细微差别和反应偏差影响的客观方法，所得的带通通道可用于临床筛查以及与心理物理学特征进行预测和比较。最后，我们将我们的结果与对著名受试者GY的研究所报告的结果进行了比较，结果显示出显著的相似性。文中讨论了这些结果对盲视研究的意义。
