Music cognition and broken brains

A reader sent me this New York Times article about music cognition that had a section on how people with Autism process music differently from everyone else, less emotionally:

Daniel J. Levitin, director of the laboratory for music perception, cognition and expertise at McGill University in Montreal, began puzzling over musical expression in 2002, after hearing a live performance of one of his favorite pieces, Mozart’s Piano Concerto No. 27.

“It just left me flat,” Dr. Levitin, who wrote the best seller “This Is Your Brain on Music” (Dutton, 2006), recalled in a video describing the project. “I thought, well, how can that be? It’s got this beautiful set of notes. The composer wrote this beautiful piece. What is the pianist doing to mess this up?”

To decipher the contribution of different musical flavorings, [Levitan and a graduate student a pianist] perform snatches of several Chopin nocturnes on a Disklavier, a piano with sensors under each key recording how long he held each note and how hard he struck each key (a measure of how loud each note sounded). The note-by-note data was useful because musicians rarely perform exactly the way the music is written on the page — rather, they add interpretation and personality to a piece by lingering on some notes and quickly releasing others, playing some louder, others softer.

The pianist’s recording became a blueprint, what researchers considered to be the 100 percent musical rendition. Then they started tinkering. A computer calculated the average loudness and length of each note Professor Plaunt played. The researchers created a version using those average values so that the music sounded homogeneous and evenly paced, with every eighth note held for an identical amount of time, each quarter note precisely double the length of an eighth note.

Study subjects listened to them in random order, rating how emotional each sounded. Musicians and nonmusicians alike found the original pianist’s performance most emotional and the averaged version least emotional.
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[T]he Levitin team found that children with autism essentially rated each nocturne rendition equally emotional, finding the original no more emotionally expressive than the mechanical version. But in other research, the team found that children with autism could label music as happy, sad or scary, suggesting, Dr. Levitin said, that “their recognition of musical emotions may be intact without necessarily having those emotions evoked, and without them necessarily experiencing those emotions themselves.”