Online reach correction in 6- and 11-month-old infants

IF 2 2区 心理学 Q3 PSYCHOLOGY, DEVELOPMENTAL
Infancy Pub Date : 2023-01-27 DOI:10.1111/infa.12524
Erik Verhaar, W. Pieter Medendorp, Sabine Hunnius, Janny C. Stapel
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Abstract

The current study investigated the development of online reach control. Six- and 11-month-old infants reached for a toy while their hand position was tracked. The toy either remained stationary (baseline trials) or unexpectedly displaced left- or rightward during the reach (perturbation trials). To obtain a measure of online reach correction, we compared reaches in the perturbation trials to reaches in baseline trials using autoregression analysis. Infants of both age groups adjusted their reach trajectories in the direction of the displacement. Moreover, we divided the reaching movements into movement units, defined as the submovements of a reach between local minima in hand speed. Eleven-month-old infants adjusted their reach within the span of a single movement unit; corrections in 6-month-olds spanned multiple movement units. These results suggest that the reach control system has a rudimentary replanning capacity by 6 months of age, which, with age, further develops to a more sophisticated online control mechanism for ongoing reaches.

Abstract Image

在线矫正6个月和11个月大的婴儿
本研究调查了在线到达控制的发展。6个月和11个月大的婴儿伸手去拿玩具,同时跟踪他们的手的位置。玩具要么保持静止(基线试验),要么在到达过程中意外地向左或向右移动(扰动试验)。为了获得在线到达校正的测量,我们使用自回归分析比较了扰动试验和基线试验的到达。两个年龄组的婴儿在位移的方向上调整了他们的到达轨迹。此外,我们将到达动作划分为动作单元,定义为手速度局部最小值之间到达的子动作。11个月大的婴儿在一个运动单元的范围内调整他们的伸手范围;6个月大的婴儿的纠正跨越了多个运动单元。这些结果表明,到6个月大时,河段控制系统具有初步的重新规划能力,随着年龄的增长,进一步发展为更复杂的持续河段在线控制机制。
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来源期刊
Infancy
Infancy PSYCHOLOGY, DEVELOPMENTAL-
CiteScore
4.00
自引率
7.70%
发文量
72
期刊介绍: Infancy, the official journal of the International Society on Infant Studies, emphasizes the highest quality original research on normal and aberrant infant development during the first two years. Both human and animal research are included. In addition to regular length research articles and brief reports (3000-word maximum), the journal includes solicited target articles along with a series of commentaries; debates, in which different theoretical positions are presented along with a series of commentaries; and thematic collections, a group of three to five reports or summaries of research on the same issue, conducted independently at different laboratories, with invited commentaries.
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