It is very difficult to correctly detect the hearing of deaf children at an early stage.For the early hearing detection of deaf children, although there are currently more advanced objective detection methods and a variety of behavior and game audiometry, it is still an important issue that has not been resolved in the world today to accurately and objectively reflect the residual hearing of deaf children. Invention project.There are two main reasons: 2. The limitations of various electrical response audiometry.For example, the auditory brainstem response (ABR) is limited by the frequency of short sounds, and the energy of short sounds is concentrated in 4-2kHz, which cannot well reflect the low-frequency auditory state.Although there is also a frequency-divided ABR (Toneburst) with a certain frequency specificity, it is time-consuming in clinical application, and the waveform differentiation is not obvious, and it is difficult to determine the position of the “V” wave.In children, the auditory system is not fully developed before the age of 1, and the incubation period and amplitude of each wave of ABR are different from those of adults; the ABR waveform of infants will change after a period of time, which will affect the identification of the threshold.85. A variety of behavior and game audiometry measures the residual hearing of deaf children in the original non-developmental state, that is, the residual hearing that has never been exploited or effectively stimulated.After a period of rehabilitation training, after the residual hearing has been effectively developed, it is obviously not very suitable to still use the previously selected and adjusted hearing aids.There was a child who was more than 35 year old and couldn’t speak. His mother took her to the hospital for examination.Through the ABR test results, it can be seen that the hearing loss of children is 2 dBnHL, and the ABR threshold of normal people is below 4 dBnHL.My mother said in disbelief that my children could hear the sound.For example, when the door is closed, children will turn their heads to look at it.Do you know why?In fact, it is very simple. The ABR result mainly reflects the sound of XNUMXK-XNUMXKHz, and it cannot reflect the sound of low frequency.The closing sound is mainly concentrated in the low frequency.Therefore, children’s residual hearing is better at low frequencies, but poor at mid-to-high frequencies.This is the limitation of the detection process.
