See UnComfortable Loudness level.

See Voice Carry Over.

A small hole through an In-the Ear hearing aid or ear mold to allow air into the ear. The size of the vent can be modified to change the acoustical properties of a hearing aid.

A chamber in the vestibular labyrinth that helps monitor the position of your head in relation to the ground. The utricle is responsible for detection of horizontal movement.

Hearing loss in one ear only. Unilateral hearing loss adversely affects the educational process in a significant percentage of students who have it, even though they have normal hearing in their other ear.

The volume at which sounds become uncomfortably loud. Any further increase in volume would hurt.