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Retinotopic mapping of the peripheral visual field to human visual cortex by functional magnetic resonance imaging

机译：通过功能性磁共振成像对周围视野到人类视觉皮层进行视网膜定位

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摘要

Retinotopic mapping is a key property of organization in the human occipital cortex. The retinotopic organization of the central visual field of visual areas V1, V2, and V3 has been well established. We used fMRI to measure the retinotopic map of the peripheral visual field (eccentricity up to 60°). We estimated the sizes of the visual areas between 0° and 60° and obtained results consistent with anatomical studies. We also estimated the cortical distances and magnification factors for reconstruction of the retinotopic map using the peripheral wedge dipole model. By comparing the retinotopic map with the flattened surface, we analyzed the datasets used to reconstruct the map. We found that: (1) the percentage of the striate cortex devoted to peripheral vision in humans is significantly larger than that in the macaque, (2) the estimate of the scaling factor in linear magnification is larger than that found in previous studies focusing on central vision, and (3) the estimate of the peripheral factor in the dipolar model is too large to make the curve direction of the dipolar map in the periphery equivalent to that in the center. On the basis of our results, we revised the dipolar map to fit our conditions. The revised map in humans has a similar elliptical shape to that of macaques, and the central parts of the two species are the same. The different parts of the map are the peripheral regions, for which the peripheral wedge dipole model in humans is reversed compared to that of macaques.
机译：视网膜网状定位是人类枕叶皮质组织的关键属性。视觉区域V1，V2和V3的中央视野的视网膜组织已经很好地建立了。我们使用功能磁共振成像来测量周围视野的视网膜位置图（离心率高达60°）。我们估计了0°和60°之间的视觉区域大小，并获得了与解剖学研究一致的结果。我们还估计了周围的楔形偶极子模型重建视网膜位图的皮层距离和放大倍数。通过比较视网膜平面图和平坦的表面，我们分析了用于重建地图的数据集。我们发现：（1）专门用于人类周边视觉的纹状体皮质的百分比显着大于猕猴，（2）线性放大比例系数的估计值大于先前研究的重点。 （3）偶极子模型中外围因子的估计值太大，无法使偶极子图在外围的曲线方向与中心的曲线方向相等。根据我们的结果，我们修改了偶极子图以适合我们的条件。修改后的人类地图具有与猕猴类似的椭圆形状，并且两个物种的中央部分相同。该图的不同部分是外围区域，与猕猴相比，人类的外围楔形偶极子模型是相反的。

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