早期基于大脑的视觉障碍中的视觉空间处理与背部和腹部视觉流的差异性招募有关
Zahide Pamir1,2, Claire E Manley3, Corinna M Bauer4
1Department of Psychology & Department of Neuroscience, Bilkent University, Üniversiteler, Çankaya/Ankara 06800, Turkey.
Cerebral cortex (New York, N.Y. : 1991)
|May 25, 2024
概括
大脑视力障碍 (CVI) 患者由于背流功能障碍而表现出视觉空间技能受损. 这项研究揭示了CVI中腹部流激活的改变,这表明注意力缺陷有助于视觉处理困难.
科学领域:
- 神经科学是一个神经科学.
- 视觉神经科学是一种神经科学.
- 认知神经科学 认知神经科学
背景情况:
- 大脑视觉障碍 (CVI) 通常涉及视觉空间处理缺陷,归因于背流功能障碍 (DSD).
- 其他大脑区域,如早期视觉皮层 (EVC),额叶皮层和腹部视觉流在CVI视觉空间障碍中的作用尚不清楚.
研究的目的:
- 在CVI患者的视觉搜索任务中调查功能磁共振成像 (fMRI) 在EVC,额叶皮层和腹部视觉流中的活动,与神经类型对照者相比.
- 为了将大脑活动与视觉搜索性能和眼睛运动的行为测量相关联.
主要方法:
- 参与者 (使用CVI和神经类型对照) 在动态的自然场景中执行了视觉搜索任务,包括定位和跟踪行走的人类目标.
- 使用眼睛跟踪收集行为数据,以评估搜索时间,目光准确度和精度.
- 在视觉搜索任务期间,fMRI被用来测量背部流,腹部流,EVC和额叶皮层中的大脑活动.
主要成果:
- 与对照组相比,CVI参与者表现出明显更长的搜索时间和不那么准确/精确的眼睛凝视模式.
- 在CVI参与者的背部流中观察到减少激活,支持DSD假设.
- 相反,在CVI参与者的腹腔流中发现了更大的激活,在EVC或前皮层激活之间没有显著差异.
结论:
- 在CVI中视觉空间处理受损与背部和腹部视觉流的差异性招募有关.
- 这些发现表明,选择性注意力受损可能是CVI观察到的视觉空间缺陷的基础,涉及改变的背部和腹部流相互作用.
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