At what decibel level is the acoustic reflex typically triggered in individuals with normal hearing?

The acoustic reflex is typically triggered at sound levels around 85 dB Hearing Threshold Level (HTL) in individuals with normal hearing. This reflex involves the contraction of the stapedius muscle in response to loud sounds, which serves to protect the inner ear from potential damage due to excessive loudness. The reflex is generally initiated at sound intensity levels in the vicinity of 80-100 dB HTL, with 85 dB being a commonly cited threshold.

The other options do not pertain to the decibel level at which the acoustic reflex is triggered. While 1000 Hz and 6500 Hz refer to specific frequencies that may be tested in a hearing assessment, they do not indicate decibel levels. Furthermore, 130 dB HTL represents an intensity level that is above the typical threshold for triggering the reflex in normal hearing and is more indicative of levels that could be damaging or well into the range of discomfort or pain. Therefore, the correct choice is the one that aligns with the established normal range for initiating the acoustic reflex.