Wattam-Bell J
Department of Psychology, University College London, U.K.
Vision Res. 1996 Jun;36(11):1671-7. doi: 10.1016/0042-6989(95)00236-7.
The ability of infants to discriminate between opposite directions of motion was assessed using forced-choice preferential looking between a random-dot pattern which was segregated into regions which moved in opposite directions, and a uniform pattern in which all the dots moved in the same direction. The first experiment measured velocity thresholds (Vmin and Vmax) for direction discrimination; between 10 and 13 weeks Vmin decreased, while at the same time Vmax increased. The second experiment explored possible implications of this expanding velocity range for direction discrimination by younger infants. One-month-olds showed no evidence for direction discrimination at any of a number of test velocities in the range 1-43 deg/sec. The 1-month-olds were also tested with two additional conditions: they could discriminate between moving and static patterns at velocities of 10 deg/sec or above, and they could also discriminate between coherent and incoherent motion at velocities of 21 deg/sec or below. Neither of these discriminations depends on sensitivity to the direction of the coherent motion. The results suggest that 1-month-olds may not be sensitive to the direction of visual motion.
通过强制选择优先注视法，利用随机点模式（该模式被分割成朝相反方向移动的区域）与所有点朝同一方向移动的均匀模式之间的对比，评估了婴儿区分相反运动方向的能力。第一个实验测量了方向辨别速度阈值（Vmin和Vmax）；在10至13周龄之间，Vmin降低，而与此同时Vmax升高。第二个实验探究了这种不断扩大的速度范围对年幼儿童方向辨别的可能影响。1月龄婴儿在1至43度/秒范围内的多个测试速度下，均未表现出方向辨别能力。1月龄婴儿还在另外两种条件下接受了测试：他们能够在速度为10度/秒及以上时区分移动模式和静态模式，并且在速度为21度/秒及以下时也能够区分连贯运动和不连贯运动。这两种辨别均不依赖于对连贯运动方向的敏感度。结果表明，1月龄婴儿可能对视觉运动的方向不敏感。
