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A gradually falling curve on an audiogram indicates that there is a decrease in hearing sensitivity at higher frequencies. This is typically characterized by thresholds that fall incrementally, often near a rate of 15-20 dB per octave. This pattern is associated with certain types of hearing loss, particularly those that affect higher frequencies, leading to a slope on the audiogram where the thresholds gradually increase in dB as the frequency rises.

The mention of a rate of 15-20 dB per octave specifically highlights that for every doubling of frequency, the hearing threshold increases by that amount, illustrating a gradual loss of ability to hear higher pitches. This falling pattern can be used to analyze the nature of an individual's hearing loss and helps audiologists in determining appropriate interventions and strategies for managing hearing difficulties.