Inner ear Is the ancient part of the ear ... longer than that of reptiles. In mammals, a cartilaginous pinna is usually present about the external opening to amplify and channel sound waves. Evolution ...

The ear can detect a time difference as slight as 30 microseconds ... The first chart (left) shows the delays (in microseconds) caused by reflections from the inner pinna ridge which determine ...

T he brain may play a role in helping the ear regulate its sensitivity to sound and compensate for hearing loss by sending a ...