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Brain section multitasks, handling phonetics and decision-making
Date:6/30/2009

PROVIDENCE, R.I. [Brown University] A front portion of the brain that handles tasks like decision-making also helps decipher different phonetic sounds, according to new Brown University research.

This section of the brain the left inferior frontal sulcus treats different pronunciations of the same speech sound (such as a 'd' sound) the same way.

In determining this, scientists have solved a mystery.

"No two pronunciations of the same speech sound are exactly alike. Listeners have to figure out whether these two different pronunciations are the same speech sound such as a 'd' or two different sounds such as a 'd' sound and a 't' sound," said Emily Myers, assistant professor (research) of cognitive and linguistic sciences at Brown University. "No one has shown before what areas of the brain are involved in these decisions."

Sheila Blumstein, the study's principal investigator, said the findings provide a window into how the brain processes speech.

"As human beings we spend much of our lives categorizing the world, and it appears as though we use the same brain areas for language that we use for categorizing non-language things like objects, said Blumstein, the Albert D. Mead Professor of Cognitive and Linguistic Sciences at Brown.

Researchers from Brown University's Department of Neuroscience and from the Department of Psychiatry at the University of Cincinnati also took part in the study. Details will be published in the July issue of the journal Psychological Science.

To conduct the research, scientists studied 13 women and five men, ages 19 to 29. All were brought into an MRI scanner at Brown University's Magnetic Resonance Facility. An MRI machine, with its powerful magnet, allows technicians to measure blood flow in response to different types of stimuli.

Subjects were asked to listen to repetitive syllables in a row as they lay in the scanner. The sounds were derived from re
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Contact: Mark Hollmer
Mark_Hollmer@brown.edu
401-863-1862
Brown University
Source:Eurekalert  

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