Machine translation of cortical activity to text with an encoder-decoder framework

A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurre...

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Published in:Nature neuroscience Vol. 23; no. 4; pp. 575 - 582
Main Authors: Makin, Joseph G, Moses, David A, Chang, Edward F
Format: Journal Article
Language:English
Published: United States Nature Publishing Group 01.04.2020
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ISSN:1097-6256, 1546-1726, 1546-1726
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Abstract A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurrent neural network to encode each sentence-length sequence of neural activity into an abstract representation, and then to decode this representation, word by word, into an English sentence. For each participant, data consist of several spoken repeats of a set of 30-50 sentences, along with the contemporaneous signals from ~250 electrodes distributed over peri-Sylvian cortices. Average word error rates across a held-out repeat set are as low as 3%. Finally, we show how decoding with limited data can be improved with transfer learning, by training certain layers of the network under multiple participants' data.
AbstractList A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurrent neural network to encode each sentence-length sequence of neural activity into an abstract representation, and then to decode this representation, word by word, into an English sentence. For each participant, data consist of several spoken repeats of a set of 30-50 sentences, along with the contemporaneous signals from ~250 electrodes distributed over peri-Sylvian cortices. Average word error rates across a held-out repeat set are as low as 3%. Finally, we show how decoding with limited data can be improved with transfer learning, by training certain layers of the network under multiple participants' data.A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurrent neural network to encode each sentence-length sequence of neural activity into an abstract representation, and then to decode this representation, word by word, into an English sentence. For each participant, data consist of several spoken repeats of a set of 30-50 sentences, along with the contemporaneous signals from ~250 electrodes distributed over peri-Sylvian cortices. Average word error rates across a held-out repeat set are as low as 3%. Finally, we show how decoding with limited data can be improved with transfer learning, by training certain layers of the network under multiple participants' data.
A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurrent neural network to encode each sentence-length sequence of neural activity into an abstract representation, and then to decode this representation, word by word, into an English sentence. For each participant, data consist of several spoken repeats of a set of 30–50 sentences, along with the contemporaneous signals from ~250 electrodes distributed over peri-Sylvian cortices. Average word error rates across a held-out repeat set are as low as 3%. Finally, we show how decoding with limited data can be improved with transfer learning, by training certain layers of the network under multiple participants’ data.Makin and colleagues decode speech from neural signals recorded during a preoperative procedure, using an algorithm inspired by machine translation. For one participant reading from a closed set of 50 sentences, decoding accuracy is nearly perfect.
A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the electrocorticogram with high accuracy and at natural-speech rates. Taking a cue from recent advances in machine translation, we train a recurrent neural network to encode each sentence-length sequence of neural activity into an abstract representation, and then to decode this representation, word by word, into an English sentence. For each participant, data consist of several spoken repeats of a set of 30-50 sentences, along with the contemporaneous signals from ~250 electrodes distributed over peri-Sylvian cortices. Average word error rates across a held-out repeat set are as low as 3%. Finally, we show how decoding with limited data can be improved with transfer learning, by training certain layers of the network under multiple participants' data.
Author Makin, Joseph G
Chang, Edward F
Moses, David A
Author_xml – sequence: 1
  givenname: Joseph G
  orcidid: 0000-0002-0053-7006
  surname: Makin
  fullname: Makin, Joseph G
  email: makin@phy.ucsf.edu, makin@phy.ucsf.edu
  organization: Department of Neurological Surgery, UCSF, San Francisco, CA, USA. makin@phy.ucsf.edu
– sequence: 2
  givenname: David A
  surname: Moses
  fullname: Moses, David A
  organization: Department of Neurological Surgery, UCSF, San Francisco, CA, USA
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  givenname: Edward F
  orcidid: 0000-0003-2480-4700
  surname: Chang
  fullname: Chang, Edward F
  email: edward.chang@ucsf.edu, edward.chang@ucsf.edu
  organization: Department of Neurological Surgery, UCSF, San Francisco, CA, USA. edward.chang@ucsf.edu
BackLink https://www.ncbi.nlm.nih.gov/pubmed/32231340$$D View this record in MEDLINE/PubMed
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Snippet A decade after speech was first decoded from human brain signals, accuracy and speed remain far below that of natural speech. Here we show how to decode the...
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StartPage 575
SubjectTerms Accuracy
Adult
Algorithms
Brain - physiology
Brain-Computer Interfaces
Cerebral cortex
Coders
Decoding
Electrocorticography
Female
Humans
Machine translation
Middle Aged
Neural networks
Neural Networks, Computer
Recurrent neural networks
Representations
Speech
Speech Perception
Transfer learning
Translation
Words (language)
Title Machine translation of cortical activity to text with an encoder-decoder framework
URI https://www.ncbi.nlm.nih.gov/pubmed/32231340
https://www.proquest.com/docview/2386355442
https://www.proquest.com/docview/2385280679
Volume 23
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