Department of Psychology, Neuroscience and Behaviour, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada.
Neuropsychologia. 2011 Dec;49(14):3863-9. doi: 10.1016/j.neuropsychologia.2011.10.002. Epub 2011 Oct 8.
Converging evidence from animal neurophysiology and human clinical studies has suggested that visual information arising from near versus far space may be mediated predominantly by different visual subsystems in the human brain. In five experiments, healthy observers either detected or identified brief peripheral targets presented in near (peripersonal) versus far (extrapersonal) space. Apparent size (subtended visual angle) and luminance were equated to provide equivalent retinal information across near and far viewing conditions. Peripheral detection accuracy declined more rapidly with increasing target eccentricity in far viewing versus near viewing conditions. Peripheral identification accuracy under similar conditions showed no such dissociation of near versus far processing with eccentricity. These data suggest that retinal information from near versus far space may be preferentially processed by substantially different neural substrates, with active modulation of the relative contributions of involved magnocellular-dorsal and parvocellular-ventral visual pathways, depending on various potential ecological uses of the retinal information.
来自动物神经生理学和人类临床研究的综合证据表明，来自近距和远距空间的视觉信息可能主要由人脑中不同的视觉子系统介导。在五项实验中，健康观察者检测或识别了在近距（个人空间）和远距（人际空间）呈现的短暂外周目标。通过调整视角和亮度，使近距和远距观察条件下的视网膜信息相等。与近距观察条件相比，远距观察条件下，随着目标离中心的距离增加，外周检测的准确性下降得更快。在类似条件下进行的外周识别准确性没有显示出与近距和远距处理的这种与离中心距离的分离。这些数据表明，来自近距和远距空间的视网膜信息可能优先由明显不同的神经基质处理，根据视网膜信息的各种潜在生态用途，对参与的大细胞背侧和小细胞腹侧视觉通路的相对贡献进行主动调节。
