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利用超广角神经成像技术在人类视觉皮层中进行沉浸式场景表征

Immersive scene representation in human visual cortex with ultra-wide angle neuroimaging.

作者信息

Park Jeongho, Soucy Edward, Segawa Jennifer, Mair Ross, Konkle Talia

机构信息

Department of Psychology, Harvard University.

Center for Brain Science, Harvard University.

出版信息

bioRxiv. 2024 Feb 16:2023.05.14.540275. doi: 10.1101/2023.05.14.540275.

Abstract

While humans experience the visual environment in a panoramic 220° view, traditional functional MRI setups are limited to display images like postcards in the central 10-15° of the visual field. Thus, it remains unknown how a scene is represented in the brain when perceived across the full visual field. Here, we developed a novel method for ultra-wide angle visual presentation and probed for signatures of immersive scene representation. To accomplish this, we bounced the projected image off angled-mirrors directly onto a custom-built curved screen, creating an unobstructed view of 175°. Scene images were created from custom-built virtual environments with a compatible wide field-of-view to avoid perceptual distortion. We found that immersive scene representation drives medial cortex with far-peripheral preferences, but surprisingly had little effect on classic scene regions. That is, scene regions showed relatively minimal modulation over dramatic changes of visual size. Further, we found that scene and face-selective regions maintain their content preferences even under conditions of central scotoma, when only the extreme far-peripheral visual field is stimulated. These results highlight that not all far-peripheral information is automatically integrated into the computations of scene regions, and that there are routes to high-level visual areas that do not require direct stimulation of the central visual field. Broadly, this work provides new clarifying evidence on content vs. peripheral preferences in scene representation, and opens new neuroimaging research avenues to understand immersive visual representation.

摘要

人类以220°的全景视角体验视觉环境,而传统的功能磁共振成像设置仅限于在视野中央10 - 15°范围内像明信片一样展示图像。因此,当在整个视野中感知场景时,大脑中如何表征该场景仍然未知。在此,我们开发了一种用于超广角视觉呈现的新方法,并探究沉浸式场景表征的特征。为实现这一点,我们将投射的图像通过角镜直接反射到定制的弧形屏幕上,创建了一个175°的无阻碍视野。场景图像由具有兼容宽视野的定制虚拟环境创建,以避免感知失真。我们发现沉浸式场景表征驱动具有远周边偏好的内侧皮质,但令人惊讶的是对经典场景区域影响很小。也就是说,场景区域在视觉大小发生巨大变化时表现出相对最小的调制。此外,我们发现即使在中央暗点的情况下,当仅刺激极端远周边视野时,场景和面孔选择性区域仍保持其内容偏好。这些结果突出表明,并非所有远周边信息都会自动整合到场景区域的计算中,并且存在通向高级视觉区域的路径,这些路径不需要直接刺激中央视野。广泛而言,这项工作为场景表征中的内容与周边偏好提供了新的明确证据,并开辟了新的神经成像研究途径来理解沉浸式视觉表征。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075b/10878588/57de53b02b40/nihpp-2023.05.14.540275v3-f0001.jpg

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