Hess R F, McCarthy J
Department of Ophthalmology McGill University, Montreal, Quebec, Canada.
Vis Neurosci. 1994 Sep-Oct;11(5):1033-6. doi: 10.1017/s0952523800003977.
One of the most striking properties of the mammalian visual system is that it is only the central part of the visual field, the fovea, where vision is most acute. The superiority of the fovea is particularly evident in tasks requiring accurate spatial localization. It is currently thought that peripheral spatial uncertainty is a simple consequence of the decreased sampling grain of the peripheral field. We show that the topological fidelity of the afferent projection declines with eccentricity away from the fovea and that it is this rather than the sampling grain that underlies the poorer performance of the periphery in tasks involving spatial localization. The combination of normal sampling and a disordered topology results in the periphery having good sensitivity for detection but poor sensitivity for object recognition.
哺乳动物视觉系统最显著的特性之一是，只有视野的中央部分，即中央凹，具有最敏锐的视觉。中央凹的优越性在需要精确空间定位的任务中尤为明显。目前认为，周边空间不确定性是周边视野采样粒度降低的简单结果。我们表明，传入投射的拓扑保真度随着远离中央凹的离心率而下降，并且正是这一点而非采样粒度导致周边在涉及空间定位的任务中表现较差。正常采样和无序拓扑的结合导致周边对检测具有良好的敏感性，但对物体识别的敏感性较差。
