Estimating receptive field size from fMRI data in human striate and extrastriate visual cortex
Estimating receptive field size from fMRI data in human striate and extrastriate visual cortex
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DOI：
10.1093/cercor/11.12.1182
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发表时间：
2001-12-01
期刊：
影响因子：
3.7
通讯作者：
Greenlee, MW
中科院分区：
文献类型：
--
作者：
Smith, AT;Singh, KD;Greenlee, MW
功能磁共振成像（fMRI）用于估计人类大脑皮层的几个纹状和纹外视觉区域中每个神经元的平均感受野大小。视觉区域的边界是通过视网膜专题图程序确定的，并在枕叶皮层的扁平表示上可视化。感受野大小的估计是根据视觉刺激穿过该位置代表的感受野时每个皮质位置的功能激活的时间持续时间得出的。初级视觉皮层 (V1) 的感受野最小。它们在 V2 中更大，在 V3/VP 中再次更大，并且在 V3A 和 V4 区域中最大。在所有这些区域中，感受野的大小随着刺激偏心率的增加而增加。该结果在质量上与其他人使用神经生理学方法在猕猴身上获得的结果一致。
Functional magnetic resonance imaging (fMRI) was used to estimate the average receptive field sizes of neurons in each of several striate and extrastriate visual areas of the human cerebral cortex. The boundaries of the visual areas were determined by retinotopic mapping procedures and were visualized on flattened representations of the occipital cortex. Estimates of receptive field size were derived from the temporal duration of the functional activation at each cortical location as a visual stimulus passed through the receptive fields represented at that location. Receptive fields are smallest in the primary visual cortex (V1). They are larger in V2, larger again in V3/VP and largest of all in areas V3A and V4. In all these areas, receptive fields increase in size with increasing stimulus eccentricity. The results are qualitatively in line with those obtained by others in macaque monkeys using neurophysiological methods.