During a hearing test, the doctor presented a series of tones to Ann through earphones. The tones were all identical, but varied from quiet to loud. The doctor asked Ann to raise her hand whenever she started to hear a sound. The doctor was testing Ann's

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The doctor is testing Ann's absolute threshold, which is the minimum amount of stimulation needed for her to detect a particular sound at least 50% of the time. The varying levels of tone intensity presented to Ann help the doctor determine her threshold for hearing a sound.

During a Hearing Test, the Doctor Presented a Series of Tones