Synesthesia (3.5e Trait)
From D&D Wiki
Your body mixes up your senses, generally a person with synesthesia is able to see sounds, hear with their eyes.
Benefit: When asked to make a listen check, you may make a spot check instead.
Drawback: Due to the over stimulation of the mind, you take a -1 penalty on all will saves.
Special: A character who cannot see or cannot hear may not take this trait
Roleplaying Ideas: People with synesthesia tend to be very creative. They tend to be composers or artists, but don't have to be.