Phonological awareness and sinusoidal amplitude modulation in phonological dislexia
Yolanda Peñaloza-López1, Aline Herrera-Rangel1, Santiago J Pérez-Ruiz2
1Laboratory of Central Auditory Alterations Research, National Institute of Rehabilitation, Mexico City, México.
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.
Conclusion:
Alterations in PA and SAM found can help to explain basis of deficient language processing exhibited by children with PD.
Related Concept Videos
Learning Disabilities
Dyslexia
Dyslexia is a...
Language and Cognition
Sinusoidal Sources
In homes, the power supplies use sinusoidal sources to provide electricity. These sources generate a voltage that varies sinusoidally...
Graphical and Analytic Representation of Sinusoids
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...


