What is the occlusion effect in relation to earplugs?

The occlusion effect refers to the phenomenon where certain sounds, particularly one's own voice, are perceived differently when the ear is blocked or covered, such as when wearing earplugs. When the ear canal is occluded, the vibrations of sound, including vibrations from the user's own vocal cords, remain trapped in the ear canal. This results in a deeper and more resonant sound of the voice, as the lower frequencies are enhanced due to the physical blockage, making it seem fuller or richer.

This effect can be particularly noticeable with certain types of earplugs that create a tighter seal in the ear canal. While the occlusion effect does not facilitate better hearing of ambient sounds or reduce comfort with earplugs, it is mostly characterized by changes in the perception of one's own voice, which is why this choice is considered correct.