首页> 外文期刊>Brain: A journal of neurology >Unconscious vision: new insights into the neuronal correlate of blindsight using diffusion tractography.
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Unconscious vision: new insights into the neuronal correlate of blindsight using diffusion tractography.

机译:潜意识:使用扩散束摄影术对失明的神经元相关性的新见解。

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The existence of several types of unconscious vision, or 'blindsight', has convincingly been demonstrated in numerous studies, and their neuronal correlates have been hypothesized according to the nature of the residual vision observed. We used diffusion tensor imaging (DTI) tractography to demonstrate an association between the presence of 'Type I'- blindsight or 'attention blindsight' and reconstructed superior colliculi (SC) fibre tracts in hemispherectomized subjects, in support of the hypothesis that this subcortical structure plays a pivotal role in this type of blindsight. Before the DTI study, 'Type I' blindsight was identified in two of four hemispherectomized subjects by using a spatial summation effect paradigm, an indirect behavioural method, in which subjects were unaware of a stimulus presented in their blind visual field and were required to respond to an identical stimulus presented simultaneously in their intact field. SC tracts were then reconstructed in six control subjects, the two hemispherectomized subjects with blindsight and the two hemispherectomized subjects without blindsight. Whereas control subjects demonstrated mainly ipsilateral connections to visual association areas, parietal cortex, prefrontal areas and to an area close to the frontal eye fields, hemispherectomized subjects with blindsight showed ipsi- and contralateral connections from the SC to visual association areas, primary visual areas, parietal areas, prefrontal areas and to the posterior part of the internal capsule. In contrast, no projections from the SC on the hemispherectomized side were observed in hemispherectomized subjects without blindsight, in support of a key role of this structure in 'Type-I' or 'attention blindsight'.
机译:在众多研究中已令人信服地证明了几种类型的无意识视觉或“盲视”的存在,并根据观察到的残余视觉的性质假设了它们的神经元相关性。我们使用弥散张量成像(DTI)束线照相术来证明“ I型”-盲视或“注意力盲视”的存在与半球形切除的受试者中重建的上结肠(SC)纤维束之间的关联,以支持这种皮层下结构的假说在这种视力中起着举足轻重的作用。在进行DTI研究之前,通过使用空间累加效应范式(间接行为方法)在四名被半球形切除的受试者中的两人中识别出“ I型”视力,其中受试者没有意识到在其盲视野中出现的刺激并且需要做出响应到在其完整领域中同时呈现的相同刺激。然后,在6个对照受试者中重建SC束,其中两个具有盲眼的半球形切除的受试者和两个没有盲眼的半球形切除的受试者。对照对象主要表现出同侧与视觉关联区域,顶叶皮层,前额叶区域以及靠近额眼区域的同侧连接,而半球切除的有视力障碍的对象则显示了从SC到视觉关联区域,主要视觉区域的同侧和对侧连接,顶区,前额区和内囊的后部。相比之下,在没有盲目的接受半球切除术的受试者中,未观察到SC的半球切除术侧的投影,以支持这种结构在“ I型”或“注意力盲视”中的关键作用。

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