An earworm, sometimes known as a brainworm,sticky music, or stuck song syndrome, is a catchy piece of music that continually repeats through a person's mind after it is no longer playing. Phrases used to describe an earworm include "musical imagery repetition", "involuntary musical imagery", and "stuck song syndrome". The word is possibly a calque from the German . The earliest known usage is in Desmond Bagley's 1978 novel Flyaway.
Researchers who have studied and written about the phenomenon include Theodor Reik, Sean Bennett, Oliver Sacks,Daniel Levitin, James Kellaris, Philip Beaman, Vicky Williamson, and, in a more theoretical perspective, Peter Szendy. The phenomenon is common and should not be confused with palinacousis, a rare medical condition caused by damage to the temporal lobe of the brain that results in auditory hallucinations.
Researcher Vicky Williamson at Goldsmiths, University of London, found in an uncontrolled study that earworms correlated with music exposure (having heard the song recently or frequently), but could also be triggered by experiences that trigger the memory of a song (involuntary memory) such as seeing a word that reminds one of the song, hearing a few notes from the song, or feeling an emotion one associates with the song. The list of songs collected in the study showed no particular pattern, other than popularity.
According to research by James Kellaris, 98% of individuals experience earworms. Women and men experience the phenomenon equally often, but earworms tend to last longer for women and irritate them more. Kellaris produced statistics suggesting that songs with lyrics may account for 73.7% of earworms, whereas instrumental music may cause only 7.7%.
In 2010, published data in the British Journal of Psychology directly addressed the subject, and its results support earlier claims that earworms are usually 15 to 30 seconds in length and are more common in those with an interest in music.