Wimperis Andrew, Wing Alan
School of Psychology, University of Birmingham, UK.
Neuropsychologia. 2007 Jun 11;45(10):2402-6. doi: 10.1016/j.neuropsychologia.2007.02.011. Epub 2007 Feb 21.
Sensory extinction following stroke, manifests as a bias in spatial attention towards ipsilesional spatial locations, which arises when stimuli from other locations compete for pathologically limited attentional resources. In the tactile domain, extinction results in a failure to verbally report tactile stimuli applied to a contralesional body part when they are timed to coincide with ipsilesional tactile contact. While it is typical for research in this area to focus on the verbal report of sensory stimuli as a measure of conscious awareness, work in visual extinction has shown that when contralesional stimuli fail to reach conscious awareness, they may still contribute to the control of actions. We describe the case of a woman with tactile extinction who failed to verbally report contralesional tactile input associated with perturbations to bimanual grasp. Despite this, the same stimulus was sufficient to drive reflexive grip force responses.
中风后的感觉消退表现为空间注意力偏向患侧空间位置，当来自其他位置的刺激争夺病理性受限的注意力资源时就会出现这种情况。在触觉领域，当对侧身体部位施加的触觉刺激与患侧触觉接触同时出现时，感觉消退会导致无法口头报告这些刺激。虽然该领域的研究通常将感觉刺激的口头报告作为意识觉知的一种测量方式，但视觉消退方面的研究表明，当对侧刺激未达到意识觉知时，它们仍可能有助于动作控制。我们描述了一名患有触觉消退的女性病例，她无法口头报告与双手抓握扰动相关的对侧触觉输入。尽管如此，相同的刺激足以驱动反射性握力反应。
