Crawling and walking infants see the world differently

Thirteen-month-old infants crawled or walked over a gridded platform while wearing a head-mounted eye tracker (Positive Science). The head-mounted cameras recorded infants' eye position and field of view. A wheeled camera alongside the platform recorded infants' locomotion from a side view. Caregivers stood at the far end of the walkway and held toys at low, medium, and high elevations to provide targets for infants' gaze. An additional group of 13-month-olds crawled or walked over a gridded platform wearing an electromagnetic motion tracker (Ascension TrakSTAR) to record position and orientation of their heads. In every study, parents provided retrospective reports of infants' locomotor experience and an experimenter measured infants' body dimensions. Additional pilot data include changes in procedure. Videos from a subset of infants were excluded for various reasons.

13个月大的婴儿佩戴头戴式眼动追踪设备（Positive Science），在网格平台上完成爬行或行走动作。该设备的头戴摄像头记录了婴儿的眼位与视野范围。平台旁的轮式摄像机从侧方视角记录婴儿的运动状态。照料者站在通道远端，分别在低、中、高三个高度握持玩具，作为婴儿的注视目标。另有一组13个月大的婴儿佩戴电磁运动追踪设备（Ascension TrakSTAR）在网格平台上爬行或行走，该设备用于采集婴儿头部的位置与姿态数据。每项实验中，家长均需提供婴儿运动经历的回顾性报告，实验人员则会测量婴儿的身体尺寸。额外的预实验数据涵盖了实验流程的调整情况。由于各类原因，部分婴儿的视频数据被排除。