The problem with some studies, including the less formal one going on at Mr. Ciofalo's home, is that even the most sensitive sound-monitoring equipment is often unable to detect the sound people say they hear.
If Joe Biden, for example, says something quietly to the President that's only audible on the most sensitive audio equipment, get sound engineers to amp it up.
The yellow stingray is most sensitive to sounds of 300 600 Hertz, which is fairly typical among sharks and rays that have been investigated thus far.
Most sensitive frequencies and threshold sound pressures at the most sensitive frequencies were obtained from individual hearing curves, and then the values were compared among both sexes of four different populations of O. nubilalis [Z type (Darmstadt) and E type (Paris)] and O. scapulalis [Z type (Matsudo) and E type (Matsudo)].
Comparisons between audiograms and sound spectra revealed that the most sensitive frequencies correlate with the dominant frequencies of stridulation sounds in all S. schoutedeni size groups and that all specimens are able to detect sounds of all size groups.
This resonance enhancement works only for sounds of relatively short wavelength those in the frequency range between 2,000 and 7,000 hertz which helps to determine the frequencies to which the ear is most sensitive, those important for distinguishing the sounds of consonants.
In all tested size groups of S. schoutedeni, the main energies of stridulation sounds correspond to the most sensitive frequency range of hearing.
However, around the onset of hearing at 2 weeks, Myo15 ΔN/ΔN mice did respond to loud sounds of 75 dB of sound pressure level (dB SPL) at 20 kHz, the most sensitive frequency range of mouse hearing.
But even though the most sensitive hair cells are inoperative, the animal can respond to sounds, although with lesser acuity.
The ear is most sensitive to the middle-frequency areas, which is where most of an automobile horn's sounds range.
