自下而上的视网膜组织支持自上而下的心理意象。

Q4 Medicine
Open Neuroimaging Journal Pub Date : 2013-12-30 eCollection Date: 2013-01-01 DOI:10.2174/1874440001307010058
Ruey-Song Huang, Martin I Sereno
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引用次数: 40

摘要

在不同地点之间寻找路径是日常生活中的例行任务。心理导航通常用于规划到达当前位置不可见的目的地的路线。我们首先使用功能性磁共振成像(fMRI)和基于表面的平均方法来寻找涉及在每个参与者非常熟悉的建筑物中位置之间想象导航的高级大脑区域。这揭示了一个心理导航网络,包括楔前叶、脾后皮质(RSC)、海马旁位区(PPA)、枕位区(OPA)、辅助运动区(SMA)、运动前皮质以及沿顶内沟内侧和前部的区域。然后,我们在一组单独的功能磁共振成像实验中使用宽视场、自然场景刺激来可视化整个皮层的视网膜定位图。这显示了五个不同的视觉流或“手指”,它们向前延伸到颞叶中部、顶叶上、顶叶内侧、脾后和腹侧枕颞皮层。通过使用球面变形来重叠这两个数据集,我们发现心理导航网络主要占据包含视网膜异位图的区域。具体来说,场景选择区域RSC、PPA和OPA共同强调上视野的远外围。这些结果表明,自下而上的视网膜组织可能有助于在以眼睛为中心的参考框架中有效地编码场景和位置信息,从而实现自上而下、内部生成的心理导航。这项研究将视觉皮层的边界推向比最初预期的更前的位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Bottom-up Retinotopic Organization Supports Top-down Mental Imagery.

Bottom-up Retinotopic Organization Supports Top-down Mental Imagery.

Bottom-up Retinotopic Organization Supports Top-down Mental Imagery.

Bottom-up Retinotopic Organization Supports Top-down Mental Imagery.

Finding a path between locations is a routine task in daily life. Mental navigation is often used to plan a route to a destination that is not visible from the current location. We first used functional magnetic resonance imaging (fMRI) and surface-based averaging methods to find high-level brain regions involved in imagined navigation between locations in a building very familiar to each participant. This revealed a mental navigation network that includes the precuneus, retrosplenial cortex (RSC), parahippocampal place area (PPA), occipital place area (OPA), supplementary motor area (SMA), premotor cortex, and areas along the medial and anterior intraparietal sulcus. We then visualized retinotopic maps in the entire cortex using wide-field, natural scene stimuli in a separate set of fMRI experiments. This revealed five distinct visual streams or 'fingers' that extend anteriorly into middle temporal, superior parietal, medial parietal, retrosplenial and ventral occipitotemporal cortex. By using spherical morphing to overlap these two data sets, we showed that the mental navigation network primarily occupies areas that also contain retinotopic maps. Specifically, scene-selective regions RSC, PPA and OPA have a common emphasis on the far periphery of the upper visual field. These results suggest that bottom-up retinotopic organization may help to efficiently encode scene and location information in an eye-centered reference frame for top-down, internally generated mental navigation. This study pushes the border of visual cortex further anterior than was initially expected.

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来源期刊
Open Neuroimaging Journal
Open Neuroimaging Journal Medicine-Radiology, Nuclear Medicine and Imaging
CiteScore
0.70
自引率
0.00%
发文量
3
期刊介绍: The Open Neuroimaging Journal is an Open Access online journal, which publishes research articles, reviews/mini-reviews, and letters in all important areas of brain function, structure and organization including neuroimaging, neuroradiology, analysis methods, functional MRI acquisition and physics, brain mapping, macroscopic level of brain organization, computational modeling and analysis, structure-function and brain-behavior relationships, anatomy and physiology, psychiatric diseases and disorders of the nervous system, use of imaging to the understanding of brain pathology and brain abnormalities, cognition and aging, social neuroscience, sensorimotor processing, communication and learning.
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