Missing frequencies in conversation
Depending on the cause, nature, and severity of hearing loss, not only the sensitivity of the sound intensity can be affected, but also the perception of certain tone pitches. These are measured as frequencies and indicated in the physical unit hertz.
Healthy ears hear a frequency range up to approximately 16.000 hertz, at most 20.000 hertz. Frequencies above this value don’t trigger any sound sensation in the inner ear. We hear the frequency range between 500 and 6.000 hertz best. This range is exactly consistent with the range of the tone pitches of the human speech.
Those who perceive high tones merely to a limited extend are subject to typical misunderstandings in conversations. Especially breathed consonants with a high noise fraction, such as S, F, and SCH, are confused. Sometimes, this misrepresents the sense of the spoken word significantly.
Examples for the confusions due to hearing loss are, amongst others, “bread” and “red”, “sand” and “hand” as well as “house” and “mouse”.