have you ever known someone who claims that
he sees colors when listening to music?

this ability is known as Synesthesia

Stedman's Medical Dictionary defines synesthesia as,
"A condition in which one type of stimulation
evokes the sensation of another,
as when the hearing of a sound
produces the visualization of a color."

have you ever wondered how such
an experience is possible?


researcher David Eagleman
is seeking an to answer this question

in the video below,
Dr. Eagleman defines synesthesia and
proposes a neurological basis