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Timing variability in children with early-treated congenital hypothyroidism
L Kooistra1, T A Snijders, J M Schellekens
1Laboratory of Experimental Clinical Psychology, University of Groningen, The Netherlands. kooistra@cardiff.ac.uk
Insights
Children with early-treated congenital hypothyroidism (CH) exhibit motor timing issues. These timing problems stem from peripheral motor delays, not central clock deficiencies, indicating motor execution challenges.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Motor Control
Background:
- Congenital hypothyroidism (CH) can impact cerebellar development, potentially affecting motor timing.
- The Wing and Kristofferson model provides a framework for analyzing timing variability in repetitive movements.
- Understanding central (timekeeper) and peripheral (motor delay) timing is crucial for assessing motor deficits.
Purpose of the Study:
- To investigate central and peripheral timing variability in children with early-treated CH using a refined Wing and Kristofferson model.
- To determine if timing deficits in CH are primarily related to central timekeeper function or peripheral motor execution.
- To compare timing variability between children with early-treated CH (varying severity) and normal controls.
Main Methods:
- Applied a refined Wing and Kristofferson model to analyze self-paced tapping tasks.
- Estimated central clock variance and peripheral motor delay variance from response interval variability.
- Included 46 children with early-treated CH (21 severe, 25 mild) and 34 healthy controls.
Main Results:
- Children with early-treated CH showed a fourfold increase in motor delay variance compared to controls.
- No significant difference in central clock variance was found between children with CH and controls.
- Severity of CH (mild vs. severe) did not appear to influence the observed timing deficits.
Conclusions:
- Motor timing problems in early-treated CH are predominantly linked to peripheral motor execution deficits.
- Central timekeeper function appears unaffected by early-treated CH, suggesting preserved cognitive timing mechanisms.
- Findings highlight the importance of addressing peripheral motor control in the rehabilitation of children with CH.
Abstract:
This study reports on central and peripheral determinants of timing variability in self-paced tapping by children with early-treated congenital hypothyroidism (CH). A theoretical model of the timing of repetitive movements developed by Wing and Kristofferson was applied to estimate the central timekeeper (clock) and peripheral implementation (motor delay) variances from the variability in the response intervals. Before it is diagnosed and treated, CH is known to affect proper development of the cerebellum. If this would affect the time-keeper function of the cerebellum, it should be reflected by an increased central clock variability rather than by an increased peripheral motor-delay variability in terms of the Wing and Kristofferson model. Results of 46 children with early-treated CH, differing in severity (21 severe, 25 mild), and 34 normal controls are reported. A refinement of the Wing and Kristofferson model is applied to estimate central clock and peripheral motor delay timing variability more precisely than has been done before. Results show that for children with early-treated CH the estimate of the motor delay variance is four times higher than for the controls, while the estimate of the clock variance does not differ between the groups. It is concluded that motor problems in early-treated CH are associated with peripheral rather than with central timing deficiencies.