Shimojo S, Held R
Vision Res. 1987;27(1):77-86. doi: 10.1016/0042-6989(87)90144-1.
Vernier acuity and grating acuity were measured longitudinally starting at 1 or 2 months of age in 22 infants, using a two-alternative, forced-choice preferential looking technique. For vernier acuity, the motion-sound display was employed. For grating acuity, a preferential looking method was employed. Steps of the stimulus (vernier offset and spatial frequency of the grating) and procedures were basically identical between the two acuity tests. The range of stimuli was set so as to compare the two acuities at younger ages. Results show: vernier acuity is less than grating acuity at 11-12 weeks of age or younger, and the developmental rate of vernier acuity is greater than that of grating acuity in the first half-year of life. To interpret the data, it was speculated that: the mean sampling distance (center-to-center distance between receptive fields) may influence vernier acuity more than grating acuity, whereas the size of the receptive field may influence grating acuity more than vernier acuity: when the mean sampling distance is large relative to the size of the receptive field, vernier acuity may be less than grating acuity. Thus, the neonatal visual system, just as the visual system in the periphery and in strabismic amblyopia, may be characterized by spatial undersampling.
使用二选一、强迫选择优先注视技术，对22名婴儿从1或2个月大开始纵向测量游标视力和光栅视力。对于游标视力，采用运动-声音显示。对于光栅视力，采用优先注视法。两种视力测试中刺激的步长（游标偏移和光栅的空间频率）和程序基本相同。设置刺激范围以便在较小年龄比较两种视力。结果显示：在11至12周龄及更小的时候，游标视力低于光栅视力，并且在生命的上半年游标视力的发育速度大于光栅视力。为了解释这些数据，推测如下：平均采样距离（感受野之间的中心距）对游标视力的影响可能大于对光栅视力的影响，而感受野的大小对光栅视力的影响可能大于对游标视力的影响：当平均采样距离相对于感受野的大小较大时，游标视力可能低于光栅视力。因此，新生儿视觉系统，就像周边视觉系统和斜视性弱视中的视觉系统一样，可能具有空间欠采样的特征。
