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Can You “Hear” Movement?

August 7th, 2008 Medgadget Editors News


Melissa Saenz, Ph.D., a postdoc at Caltech, has discovered that the video above can identify people with auditory synesthesia, a condition that can make some people hear music, even though there is no music being played. Are you one? Let us know!
From the press statement by Caltech:

“While I was running an experiment at the Caltech Brain Imaging Center, a group of students happened to pass by on a tour, and I volunteered to explain what I was doing,” explains Saenz, who, along with Christof Koch, the Lois and Victor Troendle Professor of Cognitive and Behavioral Biology at Caltech and professor of computation and neural systems, reports the finding in the August 5 issue of the journal Current Biology.
“As part of the experiment, a moving display was running on my computer screen with dots rapidly expanding out, somewhat like the opening scene of Star Wars. Out of the blue, one of the students asked, “Does anyone else hear something when you look at that?” After talking to him further, I realized that his experience had all the characteristics of a synesthesia: an automatic sensory cross-activation that he had experienced all of his life,” says Saenz.
A search of the synesthesia literature revealed that auditory synesthesia–of any kind–had never been reported. Intrigued, Saenz began to look for other individuals with the same ability, using the original movie seen by the student as a test. “I queried a few hundred people and three more individuals turned up,” she says. “Having that specific example made it easy to find more people. That movie just happens to be quite “noisy” to the synesthetes and was a great screening tool. When asked if it made a sound, one of the individuals responded, “how could it not?” I would have been less successful had I just generally asked, “Do you hear sounds when you see things move or flash?” because in the real environment, things that move often really do make a sound,” for example, a buzzing bee.
This may be why auditory synesthesia hadn’t been detected by neurobiologists. “People with auditory synesthesia may be even less likely than people with other synesthetic associations to fully realize that their experience is unusual. These individuals have an enhanced soundtrack in life, rather than a dramatically different experience, compared to others,” says Saenz. However, when asked, all of the synesthetes could name examples of daily visual events that caused sounds that they logically knew to be only in their minds, such as seeing a fluttering butterfly or watching television with the sound turned off.

Press release: Caltech Neurobiologists Discover Individuals Who “Hear” Movement…
"Hearing-motion" Demo…

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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