Corballis M C
Department of Psychology, University of Auckland, New Zealand.
Behav Brain Res. 1994 Oct 20;64(1-2):163-72. doi: 10.1016/0166-4328(94)90128-7.
It has been widely accepted that there is little if any interhemispheric transfer of perceptual information in subjects following section of the forebrain commissures, although there may be diffuse transfer of emotional and connotative information, and an ability to direct spatial attention between hemispheres. However Sergent has recently shown that split-brained subjects can make rapid and accurate perceptual judgments based on visual stimuli presented simultaneously to the two visual fields. These include judgments of alignment, judgments of relative quantity, and higher-order judgments such as lexical decisions about letter strings straddling the visual fields. However it is premature to conclude that these tasks are accomplished by subcortical transfer of perceptual information; at least some of them can be explained in terms of strategies based on information available to just one hemisphere, or on the transfer of rudimentary information, perhaps accomplished through cross-cueing.
人们普遍认为，在前脑连合切断的受试者中，几乎不存在感知信息的半球间传递，尽管可能存在情感和内涵信息的弥散传递，以及在半球间引导空间注意力的能力。然而，塞尔让最近表明，裂脑受试者能够基于同时呈现给两个视野的视觉刺激做出快速准确的感知判断。这些判断包括对齐判断、相对数量判断，以及诸如对跨越视野的字母串进行词汇决策等高级判断。然而，现在就得出这些任务是通过感知信息的皮质下传递来完成的结论还为时过早；其中至少一些可以用基于仅一个半球可用信息的策略，或者用基本信息的传递来解释，这种传递可能是通过交叉提示来完成的。
