Development of Proprioceptive Acuity in Typically Developing Children: Normative Data on Forearm Position Sense

Area of Science:

• Neuroscience
• Developmental Psychology
• Human Motor Control

Background:

• Proprioception, the sense of self-movement and body position, is crucial for motor control.
• Understanding the developmental trajectory of proprioception in typically developing children is essential for identifying potential deficits in clinical populations.
• Previous research has indicated developmental changes in proprioceptive abilities, but objective, large-scale data in children is limited.

Purpose of the Study:

• To objectively map the development of proprioception in healthy children aged 5-17 years.
• To quantify changes in forearm position sense acuity, including both systematic error (bias) and random error (precision), across childhood and adolescence.
• To establish normative data for proprioceptive development to aid in the assessment of pediatric patient populations.

Main Methods:

• A cross-sectional study involving 308 typically developing children (5-17 years) and 26 healthy adults (18-25 years).
• Objective measurement of forearm position sense acuity using a custom-built bimanual manipulandum.
• Participants actively matched passive displacements of their non-dominant forearm with their dominant forearm, with position error (PE) and standard deviation of position differences (SDPdiff) recorded.

Main Results:

• Systematic error (PE) in position matching did not significantly change with age, remaining relatively consistent from childhood through adulthood.
• Response variability (SDPdiff), indicating precision, significantly decreased with age, showing marked improvement from early childhood to late adolescence.
• These findings demonstrate that proprioceptive development is characterized by enhanced reliability rather than a change in accuracy.

Conclusions:

• Proprioceptive development in typically developing children is primarily an improvement in the precision and reliability of the sensory percept.
• The maturation of somatosensory pathways, including muscle spindle tuning and interhemispheric connections, likely underlies these age-related improvements.
• The normative data generated provide a valuable benchmark for evaluating position sense acuity in pediatric neurological and developmental disorders.