Cortical Correlates of Visuospatial Switching Processes Between Egocentric and Allocentric Frames of Reference: A fNIRS Study

IF 2.3 3区医学 Q3 CLINICAL NEUROLOGY Brain Topography Pub Date : 2024-02-05 DOI:10.1007/s10548-023-01032-0

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Abstract

Human beings represent spatial information according to egocentric (body-to-object) and allocentric (object-to-object) frames of reference. In everyday life, we constantly switch from one frame of reference to another in order to react effectively to the specific needs of the environment and task demands. However, to the best of our knowledge, no study to date has investigated the cortical activity of switching and non-switching processes between egocentric and allocentric spatial encodings. To this aim, a custom-designed visuo-spatial memory task was administered and the cortical activities underlying switching vs non-switching spatial processes were investigated. Changes in concentrations of oxygenated and deoxygenated haemoglobin were measured using functional near-infrared spectroscopy (fNIRS). Participants were asked to memorize triads of geometric objects and then make two consecutive judgments about the same triad. In the non-switching condition, both spatial judgments considered the same frame of reference: only egocentric or only allocentric. In the switching condition, if the first judgment was egocentric, the second one was allocentric (or vice versa). The results showed a generalized activation of the frontal regions during the switching compared to the non-switching condition. Additionally, increased cortical activity was found in the temporo-parietal junction during the switching condition compared to the non-switching condition. Overall, these results illustrate the cortical activity underlying the processing of switching between body position and environmental stimuli, showing an important role of the temporo-parietal junction and frontal regions in the preparation and switching between egocentric and allocentric reference frames.

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视觉空间参照系在 "以我为中心 "和 "以他为中心 "之间切换过程的皮层相关性：fNIRS 研究

摘要人类根据以自我为中心（身体到物体）和以分配为中心（物体到物体）的参照系来表示空间信息。在日常生活中，我们不断地从一种参照系切换到另一种参照系，以便对环境和任务的特定需求做出有效反应。然而，据我们所知，迄今为止还没有研究调查过在自我中心和分配中心空间编码之间切换和非切换过程的大脑皮层活动。为此，我们进行了一项专门设计的视觉空间记忆任务，并调查了切换与非切换空间过程的大脑皮层活动。使用功能性近红外光谱（fNIRS）测量了氧合血红蛋白和脱氧血红蛋白浓度的变化。参与者被要求记忆几何物体的三元组，然后对同一三元组做出两个连续的判断。在非转换条件下，两次空间判断均考虑同一参照系：仅以自我为中心或仅以分配为中心。在转换条件下，如果第一个判断是以自我为中心，那么第二个判断就是以分配为中心（反之亦然）。结果表明，与非转换条件相比，在转换条件下，额叶区域被普遍激活。此外，与非转换条件相比，转换条件下颞顶交界处的皮层活动有所增加。总之，这些结果说明了在身体位置和环境刺激之间进行切换时的大脑皮层活动，显示了颞顶交界处和额叶区在准备和切换以自我为中心的参照框架和以分配为中心的参照框架中的重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Brain Topography 医学-临床神经学

CiteScore

4.70

自引率

7.40%

发文量

审稿时长

3 months

期刊介绍： Brain Topography publishes clinical and basic research on cognitive neuroscience and functional neurophysiology using the full range of imaging techniques including EEG, MEG, fMRI, TMS, diffusion imaging, spectroscopy, intracranial recordings, lesion studies, and related methods. Submissions combining multiple techniques are particularly encouraged, as well as reports of new and innovative methodologies.