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Dynamical analysis of the interaction between object location and hand use in a midline crossing task in children with trisomy 21
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Advisor(s)
Abstract(s)
Objective: The aim of the study was to analyze the
influence of spatial constraints on the hand use in
children with trisomy 21.
Methods: Participants were 31 children with trisomy
(13.35 ± 2.78 years old, 18 girls) (T21) and 38 children
with typical development (8.62±.79 years old, 22 girls)
(TD), with similar APGAR scores at birth (1 mn and
5 mn), but with significantly different mental age in
Goodenough test. Children grasped seven colored
Styrofoam balls in a semi-circumference arraying; in a
pseudorandom condition (R) and in a scaling condition
(increasing sequence [IS]- from left to right hemispace;
decreasing sequence [DS]- from right to left hemispace).
Results: In the R, TD displayed a significantly greater
frequency of midline crossing than T21, as in the DS;
but not in the IS condition. T21 showed significantly
larger hysteresis in the left hemispace, as well as in the midline location, but not in the right hemispace. In R,
IS and DS, no significant differences were observed
between TD and T21 in the frequency of left-hand use.
Conclusion: Spatial constraints highly determined T21
hand-use, as clearly expressed in the pattern of midline
crossing and of hysteresis. In T21, the scaling procedure
permitted the detection of patterns of interaction among
spatial and intrinsic constraints, that the traditional
R procedure would not. This perceptual-motor pattern
of behavior should be considered as criteria in the
planning of perceptual-motor intervention for children
with T21. We propose the “task constraints attunement
hypothesis”, suggesting that T21 children (and, probably
others with developmental problems) reveal more
left-handedness and less asymmetry because they are
compelled to use the hand in accordance with spatial
constraints.
Description
Keywords
prehension laterality trisomy 21 spatial constraints hysteresis midline crossing
Citation
Catela, D. R., & de Abreu, A. M. C. B. (2018). Dynamical analysis of the interaction between object location and hand use in a midline crossing task in children with trisomy 21. Functional Neurology, Rehabilitation, and Ergonomics, 7(3), 20-23.