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Selective cortical representation of attended speaker in multi-talker speech perception


Humans possess a remarkable ability to attend to a single speaker’s voice in a multi-talker background1,2,3. How the auditory system manages to extract intelligible speech under such acoustically complex and adverse listening conditions is not known, and, indeed, it is not clear how attended speech is internally represented4,5. Here, using multi-electrode surface recordings from the cortex of subjects engaged in a listening task with two simultaneous speakers, we demonstrate that population responses in non-primary human auditory cortex encode critical features of attended speech: speech spectrograms reconstructed based on cortical responses to the mixture of speakers reveal the salient spectral and temporal features of the attended speaker, as if subjects were listening to that speaker alone. A simple classifier trained solely on examples of single speakers can decode both attended words and speaker identity. We find that task performance is well predicted by a rapid increase in attention-modulated neural selectivity across both single-electrode and population-level cortical responses. These findings demonstrate that the cortical representation of speech does not merely reflect the external acoustic environment, but instead gives rise to the perceptual aspects relevant for the listener’s intended goal.

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Figure 1: Acoustic and neural reconstructed spectrograms for speech from a single speaker or a mixture of speakers.
Figure 2: Quantifying the attentional modulation of neural responses.
Figure 3: Decoding spoken words and the identity of the attended speaker.
Figure 4: Attentional modulation of individual electrode sites.


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The authors would like to thank A. Ren for technical help, and C. Micheyl, S. Shamma and C. Schreiner for critical discussion and reading of the manuscript. E.F.C. was funded by National Institutes of Health grants R00-NS065120, DP2-OD00862, R01-DC012379, and the Ester A. and Joseph Klingenstein Foundation.

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N.M. and E.F.C. designed the experiment, collected the data, evaluated results and wrote the manuscript.

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Correspondence to Edward F. Chang.

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The authors declare no competing financial interests.

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Mesgarani, N., Chang, E. Selective cortical representation of attended speaker in multi-talker speech perception. Nature 485, 233–236 (2012).

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