Functional hearing, sometimes referred to as peripheral hearing, is typically assessed individually for each ear using headphones that have been properly calibrated. Various frequencies, denoted in Hertz (Hz), are measured at varying intensity levels, denoted in decibels (dB). In a healthy human ear, the frequency range that can be detected is normally 20–20,000 Hz, with an intensity range of 0–120 dB. Humans primarily use their hearing to perceive speech in the context of our daily lives. Depending on the speaker, speech sound components can be rendered between 125 and 8000 Hz. As a result, pure tone audiometry testing typically focuses on the 250–8000 Hz frequency range that corresponds to the frequencies found in both male and female human voices. Depending on the test subject's age, the number of specific frequencies checked may change.
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