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Evaluation of Fidgety Movements of Infants Based on Gestalt Perception Reflects Differences in Limb Movement
Hirotaka Gima1, Koji Shimatani2, Hisako Nakano3
1Child Developmental and Learning Research Center, Faculty of Regional Sciences, Tottori University, 4-101, Koyama-Minami, Tottori, 680-8550, Japan; and Graduate School of Education, The University of Tokyo, Tokyo, Japan.
Insights
The General Movement Assessment (GMA) helps predict neurological issues in infants. This study found that "average curvature" of limb movements is a key feature raters consistently use when evaluating fidgety movements (FMs) in infants.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Movement Science
Background:
- Spontaneous general movements (GMs), including fidgety movements (FMs), are crucial in infants aged 2-5 months.
- General Movement Assessment (GMA) predicts later neurological impairments, but rater consistency in perceiving kinematic information is unclear.
Purpose of the Study:
- To develop a method for identifying movement features linked to rater evaluations of FMs using GMA.
- To explore the relationship between specific kinematic features and rater judgments of FMs.
Main Methods:
- 163 healthy infants (11-16 weeks postterm) underwent GMA and 3D motion analysis.
- Three physical therapists rated FMs (continual, intermittent, sporadic) and kinematic indices (e.g., average curvature, jerk) were calculated for limbs.
Main Results:
- Average curvature of limb movements significantly differed across FM subtypes for all raters.
- Individual raters showed significant differences in average curvature for either arms or legs.
Conclusions:
- A method was developed to reveal commonalities and individual differences in perceived movement features during FM rating.
- Average curvature emerged as a key kinematic feature associated with rater perception of FMs.
Background:
Infants aged 2 to 5 months show spontaneous general movements (GMs) of the whole body, which are referred to as fidgety movements (FMs). Although previous studies have shown that evaluation of GMs by the General Movement Assessment (GMA) has predictive value about later neurological impairments, it remains unknown whether raters consistently perceive and rate such complex kinematic information.
Objective:
The purpose of this study was to construct a method to reveal which movement features are associated with each rater's evaluation of FMs based on the GMA.
Design:
GMA scores of 163 healthy infants aged 11 to 16 weeks postterm were matched with data obtained from a 3-dimensional motion analysis system.
Methods:
Three physical therapists performed the GMA and classified GMs into 9 types, from which we focused on 3 subtypes differing in the temporal organization of FMs (continual, intermittent, and sporadic FMs). We also calculated 6 movement indices (average velocity of limb movements, number of movement units, kurtosis of acceleration, jerk index, average curvature, and correlation between limb velocities) for arms and legs for each infant and analyzed which movement indices were associated with the ratings of the 3 FM subtypes by each rater.
Results:
Only the average curvature differed significantly among the ratings of the 3 FM subtypes for all 3 raters. Each rater showed significant differences in the average curvature in either arms or legs.
Limitations:
It is difficult to generalize the present results to raters with various levels of expertise and experience in using the GMA. This issue calls for further research.
Conclusions:
The method used revealed commonality and individuality about the perceived movement features that can be associated with the rating of FMs.
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