1.   In healthy people, areas of the auditory cortex that respond to different sound frequencies are of similar size.

2.   Neurons that fire in response to the same frequency tend to cluster into little islands, forming a kind of sound frequency map in the auditory cortex.

3.   Other digressions involving sound frequency ranges and Tyndall light scattering are too technical for the lay reader to follow easily.

4.   Since most people with hearing loss have more difficulty with some sound frequencies than others, the tests allow audiologists to adjust the hearing aid for maximum effect.

5.   The knock sensor detects the sound frequency this engine condition produces before the driver hears it.

6.   The knock sensor senses the sound frequency produced by this engine condition before it is audible to the driver.

7.   Then he measured vibrations in the walls of the vocal sacs and other tissues of several frog sepecies in response to a range of sound frequencies.

8.   This part of the brain contains cells, called neurons, which are sensitive to different sound frequencies.

9.   Elephants also have such wide-ranging sound frequencies, including some inaudible to humans, he said.

10.   These patients may hear certain noises, like horns honking, but the sound frequencies of conversation are beyond their reach.