The blog of Xeno, a slightly mad scientist
… People classified with perfect pitch may not actually be as in tune with the notes they hear as they think.
Played a long piece of music, a study group failed to notice when scientists turned the tones ever so slightly flat. They then misidentified in-tune sounds as being sharp.
Researchers say it demonstrates the adaptability of the mind even for those skills thought to be fixed at birth.
They have published the work in the journal Psychological Science.
Only around one in 10,000 people has the ability to correctly classify a note simply by hearing it. This phenomenon is called perfect, or absolute, pitch, and has been made famous by the well-known composers who are believed to have possessed such talents, such as Mozart and Beethoven.
Graduate student Stephen Hedger, from the University of Chicago, US, had perfect pitch identified by objective tests. He explained what it meant.
“I’m able to name any musical note in isolation without the aid of a reference note. Someone with perfect pitch would be able to tell you a car alarm is honking in F sharp, for example. Generally it enables people to identify notes across a wide variety of octaves.”
Mr Hedger was tricked by his colleague who secretly adjusted the pitch on an electronic keyboard as he was playing a tune. The notes were made flat by 33 cents – which is one-third of the distance between adjacent keys on a piano.
When the note was shifted back to its original correct key, it sounded drastically sharp to Hedger, who explained he found it “shocking” that he had not noticed the change.
A similar model was tested on 27 students with perfect pitch. They were played a piece of music for 45 minutes which was gradually changed over time to become flatter.
The subjects then perceived the flattened music as in tune, while the in-tune notes were perceived as slightly sharp.
“In the literature, perfect pitch is talked about as a fixed ability, so it was quite surprising to find that as little as 45 minutes of de-tuned music could temporarily shift note categories,” Mr Hedger told BBC News….