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Effect of postural instability on drawing errors in children: a synchronized kinematic analysis of hand drawing and
Motohide Miyahara1, Jan P Piek, Nicholas C Barrett
1School of Physical Education, University of Otago, P.O. Box 56, Dunedin, New Zealand. motohide.miyahara@stonebow.otago.ac.nz
Insights
Children
Area of Science:
- Neuroscience
- Motor Control
- Developmental Psychology
Background:
- Fine motor control is crucial for daily activities.
- Postural stability underpins precise movements.
- Understanding factors affecting drawing accuracy in children is important.
Purpose of the Study:
- To investigate the relationship between postural stability and fine motor control in children's drawing.
- To differentiate between postural instability and behavioral factors (inattention, hyperactivity) as causes of drawing errors.
Main Methods:
- Assessed 3-D kinematics of head, shoulder, and elbow, and 2-D pen movement in 24 children during a drawing task.
- Classified children into accurate (AD) and inaccurate drawing (ID) groups.
- Calculated coincidence rate of body movements with drawing errors.
Main Results:
- The inaccurate drawing (ID) group showed significantly higher coincidence rates of head and shoulder movements with errors compared to elbow movements.
- No significant difference in coincidence rates between body parts was found in the accurate drawing (AD) group.
- Parental ratings of inattention, hyperactivity, and impulsivity did not correlate with movement coincidence rates.
Conclusions:
- Inaccurate drawing in children is primarily linked to postural instability, not fidgeting from inattention or hyperactivity/impulsivity.
- Head and shoulder stability are critical for accurate drawing performance.
- Targeting postural control may improve fine motor skills in children with drawing difficulties.
Abstract:
To investigate the role that postural stability plays in fine motor control, we assessed kinematics of the head, shoulder, elbow, and the pen during an accuracy drawing task in 24 children. Twelve children were classified into an accurate drawing (AD) group and 12 children into an inaccurate drawing (ID) group based on a manual dexterity task from the movement assessment battery for children [Henderson, S. E., & Sugden, D. A. (1992). Movement assessment battery for children. London: Psychological Corporation.]. Their parents completed a questionnaire to assess children's inattention, hyperactivity, and impulsivity. An electromagnetic tracking system was used to monitor 3-D kinematic data of the body parts, while 2-D kinematic data of pen movement was simultaneously collected from a computer digitizer tablet. If a sudden body motion (1cm/s) occurred within a time window from one second prior to the onset of the drawing error to the end of the error, we considered that the error coincided with the extraneous body movement. For each drawing trial, the coincidence rate was computed as (number of coincidences)/(number of errors). The ID group had a significantly higher coincidence rate of head and shoulder movements compared with elbow movements, whereas coincidence rates did not differ between the three body parts in the AD group. Parental ratings of children's behavioral ratings of inattention, hyperactivity, and impulsivity were not correlated with the coincidence rates. The results indicated that inaccurate drawing was a result of postural instability rather than fidgeting caused by inattention or hyperactivity/impulsivity.
