Conscious vision in blindness: A new perceptual phenomenon implemented on the "wrong" side of the brain.

IF 1.3 4区 心理学 Q3 PSYCHOLOGY, MULTIDISCIPLINARY
PsyCh journal Pub Date : 2024-12-01 Epub Date: 2024-07-17 DOI:10.1002/pchj.787
Yan Bao, Bin Zhou, Xinchi Yu, Lihua Mao, Evgeny Gutyrchik, Marco Paolini, Nikos Logothetis, Ernst Pöppel
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引用次数: 0

Abstract

Patients with lesions in the visual cortex are blind in corresponding regions of the visual field, but they still may process visual information, a phenomenon referred to as residual vision or "blindsight". Here we report behavioral and fMRI observations with a patient who reports conscious vision across an extended area of blindness for moving, but not for stationary stimuli. This completion effect is shown to be of perceptual and not of conceptual origin, most likely mediated by spared representations of the visual field in the striate cortex. The neural output to extra-striate areas from regions of the deafferented striate cortex is apparently still intact; this is, for instance, indicated by preserved size constancy of visually completed stimuli. Neural responses as measured with fMRI reveal an activation only for moving stimuli, but importantly on the ipsilateral side of the brain. In a conceptual model this shift of activation to the "wrong" hemisphere is explained on the basis of an imbalance of excitatory and inhibitory interactions within and between the striate cortices due to the brain injury. The observed neuroplasticity indicated by this shift together with the behavioral observations provide important new insights into the functional architecture of the human visual system and provide new insight into the concept of consciousness.

盲人的有意识视觉:在大脑 "错误 "一侧实现的新感知现象。
视觉皮层发生病变的患者在视野的相应区域会失明,但他们仍然可以处理视觉信息,这种现象被称为残余视觉或 "盲视"。在这里,我们报告了对一名患者的行为和 fMRI 观察结果,这名患者报告说,他有意识地看到了移动而非静止刺激的盲区。结果表明,这种完成效应是知觉性的,而不是概念性的,很可能是由纹状体皮层中幸免于难的视野表征介导的。从被剥夺的纹状体皮层区域向纹状体外区域的神经输出显然仍然完好无损;例如,视觉完成刺激的大小不变性就表明了这一点。用核磁共振成像(fMRI)测量的神经反应显示,只有移动刺激才会激活,但重要的是在大脑的同侧。在一个概念模型中,这种向 "错误 "半球的激活转移是基于大脑损伤导致的纹状皮层内部和之间兴奋和抑制相互作用的不平衡。这种转移所显示的神经可塑性以及行为观察结果为人类视觉系统的功能结构提供了重要的新见解,并为意识概念提供了新见解。
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来源期刊
PsyCh journal
PsyCh journal PSYCHOLOGY, MULTIDISCIPLINARY-
CiteScore
2.70
自引率
12.50%
发文量
109
期刊介绍: PsyCh Journal, China''s first international psychology journal, publishes peer‑reviewed research articles, research reports and integrated research reviews spanning the entire spectrum of scientific psychology and its applications. PsyCh Journal is the flagship journal of the Institute of Psychology, Chinese Academy of Sciences – the only national psychology research institute in China – and reflects the high research standards of the nation. Launched in 2012, PsyCh Journal is devoted to the publication of advanced research exploring basic mechanisms of the human mind and behavior, and delivering scientific knowledge to enhance understanding of culture and society. Towards that broader goal, the Journal will provide a forum for academic exchange and a “knowledge bridge” between China and the World by showcasing high-quality, cutting-edge research related to the science and practice of psychology both within and outside of China. PsyCh Journal features original articles of both empirical and theoretical research in scientific psychology and interdisciplinary sciences, across all levels, from molecular, cellular and system, to individual, group and society. The Journal also publishes evaluative and integrative review papers on any significant research contribution in any area of scientific psychology
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