Hand Use and Grasp Sensor System in Monitoring Infant Fine Motor Development.
HsinHung Kuo, Jing Wang, Manon M Schladen and 5 others
PMID 36123986WHAT IT FOUND
A sensor-equipped toy system tracked 12 infants at home and captured how their grasping changed as they grew.
Peak force, grasp duration, and bimanual use increased with age, while force variability and hand-use asymmetry decreased, mirroring typical fine motor maturation.
Key findings
01Peak grasp force, average grasp force, and accumulated grasp time increased significantly with infant age when interacting with both the bar and candy toys.
02The percentage of bimanual grasps increased with age, while the coefficient of variation for force decreased, indicating more stable grasping over time.
03Right-hand ratios for peak force, mean force, grasp frequency, and accumulated grasp time all decreased significantly with age, suggesting a reduction in hand-use asymmetry during development.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The sample size was very small (12 infants analyzed), and the longitudinal follow-up was interrupted by the COVID-19 pandemic. The study only included typically developing infants, so it does not yet show how the system performs in infants with known motor or neurological conditions. Situational variables like the infant's mood or alertness were not controlled, which could influence grasp data. The participants were likely from a specific socioeconomic background due to the requirement for daytime home visits and proximity to the lab.
Declared interests
The authors declared no conflicts of interest. The study was approved by the Institutional Review Board of the Catholic University of America.
The easy way to misread this
Do not assume this sensor system is a validated diagnostic tool for developmental delay. This was a small pilot study on typically developing infants that demonstrated feasibility and age-related trends, not a test of the system's ability to detect pathology or predict outcomes.