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首页> 外文期刊>Journal of Neuroscience Methods >Development of a method to present wide-view visual stimuli in MRI for peripheral visual studies
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Development of a method to present wide-view visual stimuli in MRI for peripheral visual studies

机译：开发一种用于在MRI中呈现宽视野视觉刺激的方法以用于周边视觉研究

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We developed a novel wide-view visual presentation system for fMRI studies. Computer-generated images were projected onto a hemispheric, translucent screen inside the MRI bore and were then back-projected onto a 52. mm diameter screen. To achieve a wide field view, a spherical screen with a curvature radius of 30. mm was placed 30. mm away from the subjects' eyes. The subjects wore contact lenses that enabled them to focus on the screen, and the resulting visual field reached 120??. To evaluate the clarity and quality of the MRI images, a signal-to-noise ratio valuation experiment was performed. In addition, we successfully applied this visual presentation system to studies of visual retinotopic mapping and object perception neural function in the peripheral visual field. Our study demonstrated that the system is compatible with the MRI environment. Based on the wide-field mapping results, this system was more effective at mapping a checkerboard stimuli in V1-V3 from the central to peripheral visual fields. In higher-level visual areas, we successfully located several classical category-selective areas, including the face-selective area (FFA), occipital face area (OFA), house-selective area (PPA), transverse occipital sulcus (TOS), lateral occipital complex (LOC) and posterior fusiform area (pFs). In these areas, we found that the response amplitudes exhibited different decreasing trends with increasing eccentricity. In conclusion, we developed a simple, effective method for presenting wide-view visual stimuli within the MRI environment that can be applied to many kinds of fMRI studies of peripheral vision. ? 2013 Elsevier B.V.
机译：我们为功能磁共振成像研究开发了一种新颖的宽视角视觉呈现系统。将计算机生成的图像投影到MRI孔内的半球形半透明屏幕上，然后反投影到直径52.mm的屏幕上。为了获得宽视野，将曲率半径为30. mm的球形屏幕放置在距受试者眼睛30. mm处。受试者戴着隐形眼镜，使他们能够聚焦在屏幕上，并且最终的视野达到120。为了评估MRI图像的清晰度和质量，进行了信噪比评估实验。此外，我们成功地将此视觉呈现系统应用于周边视场中的视觉视网膜定位映射和对象感知神经功能的研究。我们的研究表明，该系统与MRI环境兼容。基于广域映射结果，该系统在将V1-V3中的棋盘刺激从中央视野映射到外围视野方面更加有效。在较高级别的视觉区域中，我们成功地定位了几个经典的类别选择区域，包括面部选择区域（FFA），枕面部区域（OFA），房屋选择区域（PPA），枕后横沟（TOS），外侧枕骨复合体（LOC）和后梭形区域（pFs）。在这些区域中，我们发现响应幅度随着偏心率的增加而呈现出不同的下降趋势。总之，我们开发了一种简单有效的方法来呈现MRI环境中的宽视场视觉刺激，该方法可应用于多种周围视野的fMRI研究。 ？ 2013年Elsevier B.V.

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