Classification of intended phoneme production from chronic intracortical microelectrode recordings in speech-motor cortex
Open accessAbstract
We conducted a neurophysiological study of attempted speech production in a paralyzed human volunteer using chronic microelectrode recordings. The volunteer suffers from locked-in syndrome leaving him in a state of near-total paralysis, though he maintains good cognition and sensation. In this study, we investigated the feasibility of supervised classification techniques for prediction of intended phoneme production in the absence of any overt movements including speech. Such classification or decoding ability has the potential to greatly improve the quality-of-life of many people who are otherwise unable to speak by providing a direct communicative link to the general community. We examined the performance of three classifiers on a multi-class discrimination problem in which the items were 38 American English phonemes including monophthong and diphthong vowels and consonants. The three classifiers differed in performance, but averaged between 16 and 21% overall accuracy (chance-level is 1/38 or 2.6%). Further, the distribution of phonemes classified statistically above chance was non-uniform though 20 of 38 phonemes were classified with statistical significance for all three classifiers. These preliminary results suggest supervised classification techniques are capable of performing large scale multi-class discrimination for attempted speech production and may provide the basis for future communication prostheses.
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First efforts towards a speech neuroprosthesis for an individual with vocal-tract paralysis used an intracortical neurotrophic microelectrode placed in the precentral gyrus, allowing above-chance synthesis of vowel formants and decoding of phonemes.
“The first efforts towards a speech neuroprosthesis for an individual with vocal-tract paralysis, developed by Phil Kennedy and Frank Guenther, used an intracortical neurotrophic microelectrode placed in the precentral gyrus, which allowed above-chance synthesis of vowel formants84 and decoding of phonemes85 (Fig. 1; Guenther et al. 2009 and Brumberg et al. 2011).”
From The speech neuroprosthesis (2024) · cites this paper as [85]
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- Authors
- Brumberg
- Venue
- Frontiers in Neuroscience
- Publisher
- Frontiers Media SA
- Published
- 2011-05-12
- Volume
- 5
- Pages
- 65-65
- ISSN
- 1662-453X (ISSN-L)
- PMC
- PMC3096823
- OpenAlex
- W2118949016
- Cited by
- 114
- References
- 67
- Citations by year
- 2026: 1 · 2025: 9 · 2024: 10 · 2023: 5 · 2022: 10 · 2021: 9 · 2020: 9 · 2019: 7 · 2018: 15 · 2017: 10 · 2016: 8 · 2015: 6 · 2014: 4 · 2013: 4 · 2012: 6
- FWCI
- 2.43
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Frontiers in Neuroscience (publishedVersion, cc-by)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- KU ScholarWorks (University of Kansas) (submittedVersion, other-oa)
- OpenBU (Boston University) (submittedVersion, other-oa)
- Funders
- National Science Foundation
- Center of Excellence for Learning in Education, Science and Technology
- National Institute on Deafness and Other Communication Disorders (R44DC007050, R01DC002852)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › EEG and Brain-Computer Interfaces
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neural Engineering
- Health Sciences › Medicine › Physiology › Voice and Speech Disorders
- Keywords
- phoneme classification, intracortical microelectrodes, locked-in syndrome, brain-computer interface, paralysis
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