Phonological awareness and sinusoidal amplitude modulation in phonological dislexia.
OBJECTIVE
Dyslexia is the difficulty of children in learning to read and write as results of neurological deficiencies. The objective was to test the Phonological awareness (PA) and Sinusoidal amplitude modulation (SAM) threshold in children with Phonological dyslexia (PD).


METHODS
We performed a case-control, analytic, cross sectional study. We studied 14 children with PD and 14 control children from 7 to 11 years of age, by means of PA measurement and by SAM test. The mean age of dyslexic children was 8.39 years and in the control group was 8.15.


RESULTS
Children with PD exhibited inadequate skills in PA, and SAM. We found significant correlations between PA and SAM at 4 Hertz frequency, and calculated regression equations that predicts between one-fourth and one-third of variance of measurements.


CONCLUSIONS
Alterations in PA and SAM found can help to explain basis of deficient language processing exhibited by children with PD.
Laboratory of Central Auditory Alterations Research, National Institute of Rehabilitation, Mexico City, México.
Yolanda
Y
Peñaloza-López
Laboratory of Central Auditory Alterations Research, National Institute of Rehabilitation, Mexico City, México.
Aline
A
Herrera-Rangel
Laboratory of Acoustics, Center of Applied Sciences and Technological Development, National University of Mexico, Mexico City, México.
Santiago J
SJ
Pérez-Ruiz
Laboratory of Cognitive Neurophysiology, National Institute of Rehabilitation, Mexico City, México.
Adrián
A
Poblano
D000161:Acoustic Stimulation / Q000379:methods; D000293:Adolescent; D001364:Awareness / Q000502:physiology*; D016022:Case-Control Studies; D002648:Child; D003430:Cross-Sectional Studies; D004410:Dyslexia / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007807:Language Tests; D008297:Male; D009483:Neuropsychological Tests; D010700:Phonetics; D013068:Speech Production Measurement / Q000379:methods; D066229:Speech Sound Disorder / Q000503:physiopathology*; D013997:Time Factors