Sensorineural deafness is heard, and patients who cannot understand the sensorineural hearing loss often complain that “the sound is big enough, but not clear enough”, “the sound is sometimes too light to hear, sometimes too noisy and unbearable”, “quiet environment I heard it well, but I can’t hear it when there is noise.” In fact, these complaints arise because hearing loss has an impact on verbal intelligibility. So, why does hearing loss reduce verbal intelligibility? The decline in verbal intelligibility caused by hearing loss mainly comes from four aspects:
1, audibility degradation, different spectrum information of different voices are different. As the degree of hearing loss continues to increase, patients with sensorineural hearing loss often have a vague feeling of “sound loud enough but not clear enough” because they are unable to recognize certain speech components in speech.
When hearing loss, hearing loss will gradually affect the ability to distinguish sound information above 700Hz
2, the narrower range of the auditory dynamic range The auditory dynamic range is the range of the auditory effective range between the human ear can hear the sound and the perceived sound is unbearable. The normal hearing is generally 100dB HL. As hearing decreases, the range of auditory dynamics of patients with sensorineural hearing loss gradually narrows, thereby losing the ability to perceive different levels of acoustic information.
3, frequency resolution is weakened. The frequency components contained in different sound information are different. Under normal circumstances, these different sound messages can activate different parts of the cochlea, allowing the human ear to distinguish speech from noise.
However, as the degree of hearing loss increases, the sensitivity of the cochlea in patients with sensorineural hearing loss will gradually decrease. When the frequency of the noise is close to the frequency of the speech, the lower cochlear sensitivity will not be able to distinguish between the two frequency components, thereby causing the brain to lose the ability to recognize speech information from the noise.
4, time resolving ability weakens the background noise fluctuation in daily life. When the noise intensity is at a low level, the normal hearing person can use this “short” time interval to extract the speech components in the information, thus obtaining in the noise. The ability to recognize speech.
However, for patients with hearing loss, this ability will gradually disappear as the hearing loss increases. The more difficult the background noise in the environment, the more difficult it is to extract speech information.
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Link：I can’t hear the earREF: Hearing Aids Supplier , BTE Hearing Aids, Hearing Loss
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