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Limits of object persistence:young infants perceive continuity of vertical and horizontal trajectories, but not 45-degree oblique trajectories

机译：物体持久性的限制：婴幼儿感知垂直和水平轨迹的连续性，而不是45度倾斜轨迹的连续性

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Previous research indicated that 4-month-old infants perceive continuity of objects moving on horizontal trajectories but appear to have difficulty processing occlusion events involving oblique trajectories. However, because perception of continuity of vertical trajectories has not been tested, it is uncertain whether this indicates a specific deficit for oblique trajectories or a specific advantage for horizontal trajectories. We evaluated the contribution of trajectory orientation and the form of occlusion in three experiments with 144 4-month-olds. Infants perceived continuity of horizontal and vertical trajectories under all conditions presented. However, they did not perceive continuity of an oblique (45˚) trajectory under any condition. Thus 4-month-olds appear unable to process continuity of a 45˚ trajectory. In a fourth experiment with 48 6- and 8-month-old infants, we demonstrated that by 6 months infants' difficulty with oblique trajectories is overcome. We suggest that young infants’ difficulty with oblique trajectories likely relates to immature eye movement control.
机译：先前的研究表明，四个月大的婴儿感知到物体在水平轨迹上移动的连续性，但似乎难以处理涉及倾斜轨迹的闭塞事件。但是，由于尚未测试对垂直轨迹的连续性的感知，因此不确定这是否表示倾斜轨迹存在特定缺陷或水平轨迹存在特定优势。我们在三个144个4个月大的实验中评估了轨迹方向的贡献和闭塞的形式。婴儿在所呈现的所有条件下均能感知水平和垂直轨迹的连续性。但是，他们在任何情况下都无法感知到倾斜（45˚）轨迹的连续性。因此，4个月大的孩子似乎无法处理45°轨迹的连续性。在对48个6个月和8个月大婴儿进行的第四个实验中，我们证明了到6个月时，婴儿克服了倾斜轨迹的困难。我们建议，幼儿倾斜轨迹的困难可能与不成熟的眼球运动控制有关。

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