Mu-rhythm in the brain: The neural mechanism of speech as an audio-vocal perception-action system

Mu-rhythm in the brain: The neural mechanism of speech as an audio-vocal perception-action system

The cortical mechanisms governing speech are not well understood because it is extremely challenging to measure the activity of the brain in action, that is, during speech production. Researchers in Japan have found modulation of mu-rhythms in the cortex related to speech production.

Speech production is one of the most important components in human communication. However, the cortical mechanisms governing speech are not well understood because it is extremely challenging to measure the activity of the brain in action, that is, during speech production.

Now, Takeshi Tamura and Michiteru Kitazaki at Toyohashi University of Technology, Atsuko Gunji and her colleagues at National Institute of Mental Health, Hiroshige Takeichi at RIKEN, and Hiroaki Shigemasu at Kochi University of Technology have found modulation of mu-rhythms in the cortex related to speech production.

Mu-rhythm in the brain: The neural mechanism of speech as an audio-vocal perception-action system
Credit: Michiteru Kitazaki

The researchers measured EEG (electroencephalogram) with pre-amplified electrodes during simulated , simulated vocalization with delayed auditory feedback, simulated vocalization under loud noise, and . The authors define 'mu-rhythm' as a decrease of power in 8-16Hz EEG during the task period.

The mu-rhythm at the sensory-motor cortical area was not only observed under all simulated vocalization conditions, but was also found to be boosted by the delayed feedback and attenuated by loud noises. Since these auditory interferences influence speech production, it supports the premise that audio-vocal monitoring systems play an important role in speech production. The motor-related mu-rhythm is a critical index to clarify of as an audio-vocal perception-action system.

In the future, a neurofeedback method based on monitoring mu-rhythm at the sensory- may facilitate rehabilitation of speech-related deficits.

Provided by Toyohashi University of Technology

not rated yet
add to favorites email to friend print save as pdf

Related Stories

Zeroing in on the brain's speech 'receiver'

Jun 20, 2007

A particular resonance pattern in the brain’s auditory processing region appears to be key to its ability to discriminate speech, researchers have found. They found that the inherent rhythm of neural activity called “theta ...

The auditory cortex adapts agilely with concentration

May 24, 2012

The birth of sensory perception on the human cerebral cortex is yet to be fully explained. The different areas on the cortex function in cooperation, and no perception is the outcome of only one area working alone. In his ...

Recommended for you

Children with autism have extra synapses in brain

4 hours ago

Children and adolescents with autism have a surplus of synapses in the brain, and this excess is due to a slowdown in a normal brain "pruning" process during development, according to a study by neuroscientists ...

Learning to play the piano? Sleep on it!

6 hours ago

According to researchers at the University of Montreal, the regions of the brain below the cortex play an important role as we train our bodies' movements and, critically, they interact more effectively after ...

User comments