Motor control alteration in posturography in learning-disabled children.
BACKGROUND
Some authors have mentioned that intersensory integration is damaged in children with learning disabilities (LDs), and other investigators point to motor control alterations in the same patients. Thus, we decided to study these hypotheses by means of posturographic recordings.


METHODS
A highly selected group of 27 children with LDs was compared with 27 children of control group without LDs. Patients and controls were placed on the Equitest equipment platform. Sensory organization tests evaluated different test conditions that systematically vary visual, vestibular, and foot somatosensory cues available to subjects while they attempt to maintain a stable, quiet stance. Movement coordination test involved sudden posterior and anterior translations of the patient support surface.


RESULTS
No significant correlations between scholastics and posturographic performance were observed. No difference in the six conditions and in sensory organization ratios or in visual preference between both groups was disclosed. Motor control test on children with LDs showed significant higher values in latencies in averages of large translations.


CONCLUSIONS
Our data suggest that vestibular-visual-somatosensory organization for posture control are not abnormal in children with LDs; instead, motor controls show higher latencies with large translation movements, which suggest abnormal rate and timing precision motor coordination.
Poblano
Adrián
A
Laboratorio de Neurofisiología Cognoscitiva, Instituto de la Comunicación Humana, Centro Nacional de Rehabilitación, Mexico City, Mexico. drdyslexia@starmedia.com
Ishiwara
Kioko
K
de Lourdes Arias
Ma
M
García-Pedroza
Felipe
F
Marín
Hildegarda
H
Trujillo
Marla
M
D002648:Child; D005260:Female; D006801:Humans; D007859:Learning Disabilities / Q000150:complications*; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011596:Psychomotor Disorders / Q000150:complications / Q000503:physiopathology*; D011597:Psychomotor Performance; D012027:Reflex, Vestibulo-Ocular