INTERHEMISPHERIC-TRANSFER OF VISUAL INFORMATION IN HUMANS - SPATIAL CHARACTERISTICS
INTERHEMISPHERIC-TRANSFER OF VISUAL INFORMATION IN HUMANS - SPATIAL CHARACTERISTICS
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DOI：
10.1113/jphysiol.1987.sp016474
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发表时间：
1987-03-01
影响因子：
5.5
通讯作者：
FIORENTINI, A
中科院分区：
文献类型：
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作者：
BERARDI, N;FIORENTINI, A
1.人类大脑半球间的视觉信息传递问题是利用视觉辨别任务从心理生理的角度进行探讨的，该任务具有明显的左野优势，易受知觉学习现象的影响。2.对于这项任务(辨别仅与其谐波分量的相对空间相位不同的复数栅格)，存在左场优势，并且在被测试的所有空间频率上缺乏学习效应的半球间迁移，以寻找从垂直子午线两侧移除至少5°的刺激。3.对于接近垂直经络的刺激，在空间频率为2周/度或更低的情况下，左场优势消失，学习效应完全转移。4.在较高的空间频率下，左野优势保持不变，学习效应不会从一个视域转移到另一个视域，即使在.+-时。垂直子午线0.5度，除非对比度非常高。5.空间频率为2个周期/度或更低时，学习效应的迁移是垂直经络附近对称分布的区域特有的。垂直子午线同一侧的非重叠区域之间不会发生转移。6.这些发现与视觉信息的大脑半球间转移是一致的，优先于低空间频率和高对比度，与在猫身上发现的膝盖体转移一致(Berardi，Bisti和Maffei，1987)。
1. The problem of the interhemisphere transfer of visual information in humans has been approached psychophysically, making use of a visual discrimination task that shows a clear left field advantage and is subject to the phenomenon of perceptual learning. 2. For this task (discrimination of complex gratings differing only by the relative spatial phase of their harmonic components) there is a left field advantage and a lack of interhemispheric transfer of learning effects at all spatial frequencies tested for stimuli removed at least 5 deg from either side of the vertical meridian. 3. For stimuli close to the vertical meridian, the left field advantage disappears and there is a complete transfer of learning effects, provided the fundamental spatial frequency is 2 cycles/deg or lower. 4. At higher spatial frequencies the left field advantage is maintained and the learning effects do not transfer from one visual hemifield to the other, even at .+-. 0.5 deg from the vertical meridian, unless the contrast is very high. 5. The transfer of learning effects obtained for spatial frequencies of 2 cycles/deg or lower is peculiar to regions placed close to the vertical meridian and symmetrically located on either side of it. No transfer is obtained between non-overlapping regions on the same side of the vertical meridian. 6. These findings are consistent with an interhemispheric transfer of visual information, preferential for low spatial frequencies and high contrasts, in agreement with that found for callosal transfer in the cat (Berardi, Bisti and Maffei, 1987).