Clark School Home UMD

ISR News Story

Researchers publish human auditory system study in PLoS Biology

Participants listened to words (acoustic waveform, top left), while neural signals were recorded from cortical surface electrode arrays (top right, red circles) implanted over superior and middle temporal gyrus (STG, MTG). Speech-induced cortical field potentials (bottom right, gray curves) recorded at multiple electrode sites were used to fit multi-input, multi-output models for offline decoding. The models take as input time-varying neural signals at multiple electrodes and output a spectrogram consisting of time-varying spectral power across a range of acoustic frequencies (180–7,000 Hz, bottom left). To assess decoding accuracy, the reconstructed spectrogram is compared to the spectrogram of the original acoustic waveform. Photo courtesy PLoS Biology.
Participants listened to words (acoustic waveform, top left), while neural signals were recorded from cortical surface electrode arrays (top right, red circles) implanted over superior and middle temporal gyrus (STG, MTG). Speech-induced cortical field potentials (bottom right, gray curves) recorded at multiple electrode sites were used to fit multi-input, multi-output models for offline decoding. The models take as input time-varying neural signals at multiple electrodes and output a spectrogram consisting of time-varying spectral power across a range of acoustic frequencies (180–7,000 Hz, bottom left). To assess decoding accuracy, the reconstructed spectrogram is compared to the spectrogram of the original acoustic waveform. Photo courtesy PLoS Biology.

Professor Shihab Shamma (ECE/ISR), former ISR postdoctoral researcher Stephen David*, and alumnus Nima Mesgarani** (ECE Ph.D. 2008) are three of the authors of a new study on how the human auditory system processes speech published in the Jan. 31, 2012 edition of PLoS Biology.

”Reconstructing Speech from Human Auditory Cortex” details recent progress made in understanding the human brain’s computational mechanisms for decoding speech. The researchers took advantage of rare neurosurgical procedures for the treatment of epilepsy, in which neural activity is measured directly from the brain’s cortical surface—a unique opportunity for characterizing how the human brain performs speech recognition. The recordings helped researchers understand what speech sounds could be reconstructed, or decoded, from higher order brain areas in the human auditory system.

The decoded speech representations allowed readout and identification of individual words directly from brain activity during single trial sound presentations. The results provide insights into higher order neural speech processing and suggest it may be possible to readout intended speech directly from brain activity. Potential applications include devices for those who have lost the ability to speak through illness or injury.

Brian N. Pasley, Helen Wills Neuroscience Institute, University of California Berkeley is the paper’s lead author. In addition to the University of Maryland co-authors, additional co-authors include Robert Knight, University of California San Francisco and University of California Berkeley; Adeen Flinker, University of California Berkeley; Edward Chang, University of California San Francisco; and Nathan Crone, Johns Hopkins University.

* Stephen David is now an assistant professor at Oregon Health & Science University, where he heads the Laboratory of Brain, Hearing, and Behavior in the Oregon Hearing Research Center.

** Nima Mesgarani is currently a postdoctoral researcher in the Neurological Surgery Department of the University of California, San Francisco School of Medicine. He won ISR’s George Harhalakis Outstanding Systems Engineering Graduate Student Award in 2007.

| Read a story about this research in USA Today |

Related Articles:
Presacco, Heffner, Smith to represent Maryland at Universitas 21
Auditory researchers publish sensory processing research in PNAS
Shamma, Kanold receive DURIP funding
Article by auditory researchers appears in Nature Neuroscience
Alumna Mounya Elhilali wins NSF CAREER award
Jonathan Simon is invited speaker at CHScom 2015
Shihab Shamma named to NIH advisory council
Jonathan Simon wins $1.5M NIH NIDCD grant for 'auditory scene' research
Shamma receives NIH grant to study spectro-temporal plasticity in the brain's neuronal networks
UMD neuroscience researchers publish in the journal Neuron

February 2, 2012


Prev   Next

 

 

Current Headlines

UMD Invention Could Make Your Mobile Device Almost Impossible to Break Into

Alumnus Forte Accepts Position at University of Florida

Stuart Antman wins ASME 2015 Lyapunov Award

Khaligh Wins Best Vehicular Electronics Paper Award for Third Time

What an upgrade!

New Battery Demonstrates “Sweet Spot” of Electrolyte Thickness and Composition

Northrop Grumman's R. Eric Reinke joins ISR Strategic Advisory Council

Reza Ghodssi named ASME Fellow

Gabriel's sabbatical year included residencies, keynote addresses

Sensing Drugged Driving: Fischell Researchers Receive SBIR for Roadside Drug Test

News Resources

Return to Newsroom

Search News

Archived News

Events Resources

Events Calendar