Clark School Home UMD

ISR News Story

Simon, Ding publish auditory cortex research in PNAS

ISR-affiliated Associate Professor Jonathan Simon (ECE/Biology) and his Ph.D. student Nai Ding are co-authors of a paper published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS). The online version of the article was published July 2, 2012.

“Emergence of neural encoding of auditory objects while listening to competing speakers” addresses the neural underpinnings of auditory scene analysis.

A visual scene is perceived in terms of visual objects. Similar ideas have been proposed for the analogous case of auditory scene analysis, although their hypothesized neural underpinnings have not yet been established. Ding and Simon address this question by recording from subjects selectively listening to one of two competing speakers, either of different or the same sex, using magnetoencephalography.

Individual neural representations are seen for the speech of the two speakers, with each being selectively phase locked to the rhythm of the corresponding speech stream and from which can be exclusively reconstructed the temporal envelope of that speech stream. The neural representation of the attended speech dominates responses (with latency near 100 ms) in posterior auditory cortex. Furthermore, when the intensity of the attended and background speakers is separately varied over an 8-dB range, the neural representation of the attended speech adapts only to the intensity of that speaker but not to the intensity of the background speaker, suggesting an object-level intensity gain control.

Their results indicate that concurrent auditory objects, even if spectrotemporally overlapping and not resolvable at the auditory periphery, are neurally encoded individually in auditory cortex and emerge as fundamental representational units for top-down attentional modulation and bottom-up neural adaptation.

| view the abstract | download the PDF |

Related Articles:
Simon and Alumnus Ding Publish Research in NeuroImage
Simon delivers three invited lectures in China
Jonathan Simon gives keynote speech at SPIRE workshop
Jonathan Simon is invited speaker at Paris Workshop on Decoding of Sound and Brain
Jonathan Simon is invited speaker at CHScom 2015
Jonathan Simon wins $1.5M NIH NIDCD grant for 'auditory scene' research
Presacco, Heffner, Smith to represent Maryland at Universitas 21
Simon, Ding, Chatterjee publish paper in NeuroImage
Simon is co-editor of new Springer auditory research book
NSF Science Now video features 'aging brain' research of Anderson, Simon and Presacco

July 2, 2012


Prev   Next

 

 

Current Headlines

Nima Ghalichechian begins Ohio State tenure-track position 

UMD Takes Second Place in NASA RASC-AL Competition

Coelho, Austin and Blackburn win best paper award at ICONS 2017

Ryzhov promoted, granted ISR/Smith School joint appointment

Miao Yu named Maryland Robotics Center director

Decade of TMV research leads to never-before-seen microsystems for energy storage, biosensors and self-sustaining systems

Former ISR postdoc Matthew McCarthy earns tenure at Drexel University

New TMV supercapacitor work featured in Nanotechweb article

Jonathan Fritz promoted to Research Scientist

ISR postdoc helps develop 'nanosponge' that erases and repairs incredibly small errors

News Resources

Return to Newsroom

Search News

Archived News

Events Resources

Events Calendar