Midreach correction in 7-month-olds

N E Berthier1, D J Robin

  • 1Department of Psychology, University of Massachusetts, Amherst.

Journal of Motor Behavior
|December 29, 2009
PubMed

Insights

Seven-month-old infants can adjust their reaching movements in mid-flight. This study shows infants correct their hand

Area of Science:

  • Developmental Psychology
  • Motor Control
  • Infant Perception-Action

Background:

  • Infant reaching is theorized to involve perception-action cycles.
  • These cycles involve assessing hand and target positions to guide movement.

Purpose of the Study:

  • To investigate if 7-month-old infants can correct their reaching movements mid-flight.
  • To determine the latency of such corrections when a target's location is shifted.

Main Methods:

  • Observing 12 seven-month-old infants as they reached for a target.
  • Shifting the target's location during the infants' reaches.
  • Analyzing the infants' ability to adjust hand direction mid-reach.

Main Results:

  • Infants successfully corrected their reaching direction in the majority of trials where the target was shifted.
  • The latency for these mid-flight corrections ranged between 200 and 400 milliseconds.

Conclusions:

  • The findings support the hypothesis that infants actively monitor hand and target positions during reaching.
  • Infants demonstrate an ability to adjust their movements in response to perceived errors during the reach cycle.