1.   Cells in the auditory system are listening for information from teammates on what to do next.

2.   Instead of involving simply the auditory system, the study found, tinnitus may also be caused by those parts of the brain involved in vision.

3.   Our auditory system, says Nahamoo, has filters that focus on frequencies most critical for understanding speech.

4.   Walsh and McGee study the genesis of congenital deafness and, until PETA investigated them, did studies in cats, animals whose auditory system has been extensively studied.