Neural Representations of Speech at the Cocktail Party in Human Auditory Cortex
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1 Neural Representations of Speech at the Cocktail Party in Human Auditory Cortex Jonathan Z. Simon Department of Electrical & Computer Engineering Department of Biology Institute for Systems Research University of Maryland Peking University / NYU Shanghai / Zhejiang University 2016
2 Acknowledgements Current (Simon Lab & Affiliates) Christian Brodbeck Francisco Cervantes David Nahmias Mahshid Najafi Krishna Puvvada Peng Zan Past (Simon Lab & Affiliate Labs) Nayef Ahmar Murat Aytekin Claudia Bonin Maria Chait Marisel Villafane Delgado Kim Drnec Nai Ding Victor Grau-Serrat Julian Jenkins Natalia Lapinskaya Kai Sum Li Huan Luo Ling Ma Alex Presacco Raul Rodriguez Ben Walsh Juanjuan Xiang Jiachen Zhuo Collaborators Pamela Abshire Samira Anderson Behtash Babadi Catherine Carr Monita Chatterjee Alain de Cheveigné Didier Depireux Mounya Elhilali Bernhard Englitz Jonathan Fritz Stefanie Kuchinsky Cindy Moss David Poeppel Shihab Shamma Aline Gesualdi Manhães Dan Hertz Jonas Vanthornhout Yadong Wang Undergraduate Students Abdulaziz Al-Turki Nicholas Asendorf Sonja Bohr Elizabeth Camenga Corinne Cameron Julien Dagenais Katya Dombrowski Kevin Hogan Kevin Kahn Alexandria Miller Andrea Shome Sandra Soltz Madeleine Varmer James Williams Past Postdocs & Visitors Sahar Akram Funding NIH (NIDCD, NIA, NIBIB); USDA; UMD
3 Outline Cortical Representations of Speech (via MEG) Encoding vs. Decoding Cortical Representations of the Cocktail Party Recent Results Attentional Dynamics Aging & Cortical Representations of Speech Higher Level Interference & Noise
4 Functional Brain Imaging Functional Brain Imaging = Non-invasive recording from human brain Hemodynamic techniques Electromagnetic techniques fmri functional magnetic resonance imaging PET positron emission tomography fmri & MEG can capture effects in single subjects EEG electroencephalography MEG magnetoencephalography Excellent Spatial Resolution ( ~ 1 mm) Poor Temporal Resolution ( ~ 1 s) Poor Spatial Resolution ( ~ 1 cm) Excellent Temporal Resolution ( ~ 1 ms)
5 MEG & Auditory Cortex Non-invasive, Passive, Silent Neural Recordings MEG Response Patterns Time-Locked to Stimulus Events Robust Strongly Lateralized Cortical Origin Only Pure Tone time (ms) Broadband Noise time (ms)
6 MEG Responses to Speech Modulations Auditory Model
7 MEG Responses Predicted by STRF Model Long duration speech: ~60 s (up to ~10 Hz) Linear Kernel = STRF Ding & Simon, J Neurophysiol (2012) Spectro-Temporal Response Function
8 MEG Responses Predicted by STRF Model Long duration speech: ~60 s (up to ~10 Hz) Linear Kernel = STRF Ding & Simon, J Neurophysiol (2012) Spectro-Temporal Response Function
9 Neural Reconstruction of Speech Envelope Speech Envelope Decoder MEG Responses. (up to ~ 10 Hz) stimulus speech envelope reconstructed stimulus speech envelope 2 s Ding & Simon, J Neurophysiol (2012) Zion-Golumbic et al., Neuron (2013) Reconstruction accuracy comparable to single unit & ECoG recordings
10 Neural Reconstruction of Speech Envelope Speech Envelope Decoder MEG Responses. (up to ~ 10 Hz) stimulus speech envelope reconstructed stimulus speech envelope 2 s Ding & Simon, J Neurophysiol (2012) Zion-Golumbic et al., Neuron (2013) Reconstruction accuracy comparable to single unit & ECoG recordings
11 Neural Reconstruction of Speech Envelope Speech Envelope Decoder MEG Responses. (up to ~ 10 Hz) stimulus speech envelope reconstructed stimulus speech envelope 2 s Ding & Simon, J Neurophysiol (2012) Zion-Golumbic et al., Neuron (2013) Reconstruction accuracy comparable to single unit & ECoG recordings
12 Neural Representation of Speech: Temporal
13 Speech in Stationary Noise Ding & Simon, J Neuroscience (2013)
14 Speech in Stationary Noise Ding & Simon, J Neuroscience (2013)
15 Ding & Simon, J Neuroscience (2013) Speech in Noise: Results Neural Reconstruction of Underlying Speech Envelope +6 db 1 s -6 db
16 Speech in Noise: Results Neural Reconstruction of Underlying Speech Envelope +6 db 1 s -6 db B Reconstruction Accuracy.2 correlation.1 0 Q SNR (db) Ding & Simon, J Neuroscience (2013)
17 Speech in Noise: Results Neural Reconstruction of Underlying Speech Envelope +6 db 1 s -6 db C Correlation with Intelligiblity B correlation Reconstruction Accuracy Q SNR (db) reconstruction accuracy intelligiblity (%) across Subjects Ding & Simon, J Neuroscience (2013)
18 Noise-Vocoded Speech Intelligibility Reflected only in Delta Band (1 4 Hz) Ding, Chatterjee & Simon, NeuroImage (2014)
19 Multiple Cortical Speech Representations? Di Liberto, et al. (2015) Low-Frequency Cortical Entrainment to Speech Reflects Phoneme-Level Processing Kayser et al. (2015) Irregular Speech Rate Dissociates Auditory Cortical Entrainment, Evoked Responses, and Frontal Alpha Ding et al. (2015) Cortical tracking of hierarchical linguistic structures in connected speech
20 Cortical Speech Representations Neural Representations: Encoding & Decoding Linear models: Useful & Robust Speech Envelope only (as seen in MEG) Envelope Rates: ~ 1-10 Hz Intelligibility linked to lower range of frequencies (Delta)
21 Listening to Speech at the Cocktail Party Alex Katz, The Cocktail Party
22 Listening to Speech at the Cocktail Party Alex Katz, The Cocktail Party
23 Listening to Speech at the Cocktail Party Alex Katz, The Cocktail Party
24 Listening to Speech at the Cocktail Party Alex Katz, The Cocktail Party
25 Competing Speech Streams speech competing speech
26 Selective Neural Encoding
27 Selective Neural Encoding
28 Unselective vs. Selective Neural Encoding
29 Selective Neural Encoding
30 Selective Encoding: Results representative subject attending to speaker 1 attending to speaker 2 reconstructed from MEG attended speech envelopes reconstructed from MEG Ding & Simon, PNAS (2012) Identical Stimuli!
31 Single Trial Speech Reconstruction Ding & Simon, PNAS (2012)
32 Single Trial Speech Reconstruction Ding & Simon, PNAS (2012)
33 STRF Results frequency (khz) Attended time (ms) Background time (ms) TRF background STRF separable (time, frequency) 300 Hz - 2 khz dominant carriers M50STRF positive peak M100STRF negative peak M100STRF strongly modulated by attention, but not M50STRF attended
34 Neural Sources M100STRF source near (same as?) M100 source: Planum Temporale anterior Left M50STRF M100STRF Right M50STRF source is anterior and medial to M100 (same as M50?): Heschl s Gyrus posterior PT strongly modulated by attention, but not HG M100 medial 5 mm
35 Recent Results Attentional Dynamics Aging & Cortical Representations of Speech High Level Interference & Noise
36 Recent Results Attentional Dynamics Aging & Cortical Representations of Speech High Level Interference & Noise
37 Attentional Dynamics Attend to Speaker 1 Probability of attending Speaker 1 Attend to Speaker 2 Akram et al., NeuroImage (2016)
38 Attentional Dynamics Attend to Speaker 1 Probability of attending Speaker 1 Attend to Speaker 2 Switch Attention Akram et al., NeuroImage (2016)
39 Recent Results Attentional Dynamics Aging & Cortical Representations of Speech High Level Interference & Noise
40 Aging & Auditory Cortex Standardized amplitude (ft) * Younger Older Older Younger -3-5 * Time (ms) Average Responses to Pure Tone
41 Aging & Auditory Cortex Standardized amplitude (ft) * Younger Older Older Younger -3-5 * Over-Representation Time (ms) Average Responses to Pure Tone
42 Aging & Auditory Cortex 3 * Younger Older Older Younger Older Younger Standardized amplitude (ft) z-score 4 2 Over- Representation -5 * Over-Representation Time (ms) Average Responses to Pure Tone 0 M100 Power by Subject
43 Speech Over-Representation Reconstruction Accuracy Presacco et al., J Neurophysiol (2016a) Speech Reconstruction by Subject
44 Reconstruction Accuracy Speech Over-Representation Older Younger *** 0.4 ** 0.3 ** *** * Quiet +3 db 0 db -3 db -6 db Speech Reconstruction by SNR Reconstruction Accuracy Presacco et al., J Neurophysiol (2016a) Speech Reconstruction by Subject
45 Reconstruction Accuracy Aging & Integration Time Younger Adults Older Adults In Quiet In Quiet with Competing Speaker with Competing Speaker Integration window (ms) Presacco et al., J Neurophysiol (2016a)
46 Reconstruction Accuracy Neural vs Inhibitory Control Older ρ = 0.62 Younger ρ = 0.43 Presacco et al., J Neurophysiol (2016b) Flanker Score
47 Recent Results Attentional Dynamics Aging & Cortical Representations of Speech High Level Interference & Noise
48 Reconstruction Accuracy High Level Interference Effects In Quiet Presacco et al., J Neurophysiol (2016b) Speech Reconstruction by SNR
49 Reconstruction Accuracy High Level Interference Effects In Quiet Unfamiliarity of Background - Boosts Intelligibility of Attended Speech Speech Reconstruction by SNR Presacco et al., J Neurophysiol (2016b)
50 Reconstruction Accuracy High Level Interference Effects In Quiet Unfamiliarity of Background - Boosts Intelligibility of Attended Speech Speech Reconstruction by SNR Presacco et al., J Neurophysiol (2016b)
51 Reconstruction Accuracy High Level Interference Effects In Quiet Unfamiliar Unfamiliar Unfamiliarity of Background - Boosts Intelligibility of Attended Speech Presacco et al., J Neurophysiol (2016b) Speech Reconstruction by SNR
52 Reconstruction Accuracy High Level Interference Effects In Quiet Unfamiliar Unfamiliar Unfamiliarity of Background - Boosts Intelligibility of Attended Speech - Also Boosts Cortical Reconstruction of Attended Speech Presacco et al., J Neurophysiol (2016b) Speech Reconstruction by SNR
53 Summary Cortical representations of speech - representation of envelope (up to ~10 Hz) - robust against a variety of noise types - neural representation of perceptual object Object-based representation at 100 ms latency (PT), but not by 50 ms (HG) Robust Dynamical Foreground Monitoring Over-Representation with Aging - Reconstruction depends on integration time - Over-Representation tracks inhibitory control Background familiarity: neural tracks behavior
54 Thank You
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