کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4335157 1295130 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of a method to present wide-view visual stimuli in MRI for peripheral visual studies
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب (عمومی)
پیش نمایش صفحه اول مقاله
Development of a method to present wide-view visual stimuli in MRI for peripheral visual studies
چکیده انگلیسی

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.


► A novel method for wide-field stimulus presentation in the MRI environment.
► The presented stimuli covered a visual field of 120° with high resolution.
► Neural response to face and house decreased differently with increasing eccentricity.
► The method is compatible with the MRI environment.
► This method can be applied for various fMRI studies on peripheral vision.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Neuroscience Methods - Volume 214, Issue 2, 15 April 2013, Pages 126–136
نویسندگان
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