Passive hearing abilities of dyslexia children: Investigating the rumble frequency of skull bones

Dyslexia is a specific learning disorder characterized with impairment of auditory frequency discrimination, impaired perception of amplitude, and modulation. The relation between sound discrimination and the passive hearing and sound conduction through the skull bone resonance cavities is still unclear. Methodology: 31 children diagnosed by dsm-5 as Dyslexia, sample collected from the dyslexia unit in( snsc) affiliated to, Asu.,along July 2022 to July 2023 with age range from 6 to 14 years, and both sexes were included. Material and apparatus: A calibrated 8 microphones for record and analysis at 63 Hz to 16 kHz via customised skull bone resonance cavity helmet. while seated in a room with RC25 chamber in a quiet laboratory Results: 31 dyslexic children age range 6_14, 22 males, and 9 females. normal bone resonance resulted in 8 children, while abnormal bone resonance was in 23 children. Two categories of abnormalities of the sound: (a) damping frequency, at a low/mid frequency ranging between 120 and 1000 Hz in 8 children. (b)rumble frequency, damping at a frequency ranging between 120 and 500 Hz, and further increase to range 1000 to 8000 Hz in 15 children. The sinuses sound abnormalities were in frontal and mastoid equally n = 21(67.7%), followed by maxillary n = 19(61.29%), more dominant on the right side. Conclusion: Investigating the skull bone resonance cavities can have good reflection on the sinuses condition, where further investigations will be mandatory and clinical intervention of the sinuses disease is to be essential.