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Production and perception of contralateral reaching: a close link by 12 months of age
Anne Melzer1, Wolfgang Prinz, Moritz M Daum
1Max Planck Institute for Human Cognitive and Brain Sciences, 04103 Leipzig, Germany. melzera@cbs.mpg.de
Insights
Twelve-month-old infants anticipate action goals, unlike 6-month-olds. This study shows that developing action perception and production requires experience for infants to link observed movements with their own reaching actions.
Area of Science:
- Developmental Psychology
- Cognitive Neuroscience
- Infant Motor Development
Background:
- Infants develop complex motor skills and perceptual abilities over time.
- Understanding the interplay between action production and perception is crucial for cognitive development.
Purpose of the Study:
- To measure and compare action production and perception skills in 6- and 12-month-old infants.
- To investigate goal anticipation in both action production and perception tasks.
- To determine the developmental link between action production and perception in infancy.
Main Methods:
- A within-subject design was used, examining infants in both production and perception tasks.
- Production task: Measured frequency of contralateral reaching movements in infants.
- Perception task: Analyzed infants' anticipatory eye movements while viewing contralateral movements.
Main Results:
- Twelve-month-olds demonstrated more frequent contralateral reaching than 6-month-olds.
- Twelve-month-olds anticipated action goals, while 6-month-olds primarily followed actions.
- A significant link between action production and perception was found at 12 months, but not at 6 months.
Conclusions:
- Anticipatory eye movements in infants do not immediately mirror their reaching production.
- Infants require a period of experience to develop a unified representation of producing and perceiving reaching movements.
- This developmental progression highlights the maturation of sensorimotor integration in early infancy.
Abstract:
The goal of the present study was to measure infants' action production and perception skills with tasks that both include goal anticipation, in a within-subject design. In the production task, the frequency of 6- and 12-month-old infants' contralateral reaching movements was examined. In the perception task, videos of contralateral movements being performed were presented to the same infants and anticipatory eye movements were analysed. The main findings were: (1) 12-month-olds used their contralateral hand more frequently than 6-month-olds; (2) 12-month-olds mainly anticipated the goals of observed actions, whereas 6-month-olds mainly followed the action; finally, and most importantly, (3) at 12 months, production and perception were linked, but at 6 months, this was not yet the case. Our results show that anticipatory eye movements do not instantly reflect infants' reaching production. A certain amount of experience is required to establish a common representation of the production and the perception of reaching movements.
