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Algorithms for High-Performance Brain-Computer Interfaces
Algorithms for High-Performance Brain-Computer Interfaces
Algorithms for High-Performance Brain-Computer Interfaces

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자료유형  
 학위논문 서양
최종처리일시  
20260202104857
ISBN  
9798288815935
DDC  
658.3124
저자명  
Wilson, Guy.
서명/저자  
Algorithms for High-Performance Brain-Computer Interfaces
발행사항  
[Sl] : Stanford University, 2023
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2023
형태사항  
118 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Druckmann, Shaul.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2023.
초록/해제  
요약Brain-computer interfaces (BCIs) are a set of technologies that enable people to interact with devices by directly translating neural activity into command signals. Noninvasive methods such as EEG and fMRI allow minimal-risk access to brain signals but are limited by low spatial and temporal resolution, respectively. By contrast, intracortical BCIs (iBCIs) benefit from unparalleled spatial and temporal resolution recordings of local neuronal ensembles, resulting in some of the highest-performance communication systems to date. While promising, several key challenges remain for wider adoption of these technologies. First, iBCIs in particular suffer from signal instability that cause performance degradation across time. A key challenge for clinical translation of these iBCI cursor systems is ensuring robust, long-term control for end users without manual retraining. Second, while these technologies have enabled point-and-click based typing interfaces approaching 8-10 words per minute, an ideal interface would match the bandwidth of conversational speech (roughly 150 words per minute). Third, intracortical systems require brain surgery, which has inherent risks due to the invasive nature of the procedure. Developing noninvasive approaches for silent speech decoding may therefore be more suitable for a subset of patients. In this work, we discuss three advances that tackle these key areas by leveraging modern machine learning methods alongside high signal-to-noise (SNR) recording systems. First, we present an unsupervised recalibration procedure for improving cursor BCI robustness. Using data from our clinical trial participant, we highlight the extent and timescales of neural feature drift. We demonstrate how existing state-of-the-art procedures are seemingly ill-equipped to deal with long-term drift using both offline data as well as simulation models. We then introduce a novel procedure that leverages task structure to recalibrate a system automatically, and demonstrate superior performance in-silico and in closed-loop in our participant. Second, we lay the groundwork for intracortical speech BCI efforts by prototyping a system in an offline manner using microelectrode arrays in dorsal motor cortex. We demonstrate that, despite being located in a nontraditional brain area for speech decoding, our arrays provide high SNR compared to existing approaches. Third, we leverage skin-like flexible electronics and deep learning for silent speech decoding from electromyography (EMG) signals.
일반주제명  
User training
일반주제명  
Electrodes
일반주제명  
Bandwidths
일반주제명  
Signal processing
일반주제명  
Neural networks
일반주제명  
Electroencephalography
일반주제명  
Acoustics
일반주제명  
Speech
일반주제명  
Brain surgery
일반주제명  
Neurosciences
키워드  
Brain-computer interfaces
키워드  
Machine learning
키워드  
Intracortical systems
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aWilson,  Guy.
■24510▼aAlgorithms  for  High-Performance  Brain-Computer  Interfaces
■260    ▼a[Sl]▼bStanford  University▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a118  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Druckmann,  Shaul.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2023.
■520    ▼aBrain-computer  interfaces  (BCIs)  are  a  set  of  technologies  that  enable  people  to  interact  with  devices  by  directly  translating  neural  activity  into  command  signals.  Noninvasive  methods  such  as  EEG  and  fMRI  allow  minimal-risk  access  to  brain  signals  but  are  limited  by  low  spatial  and  temporal  resolution,  respectively.  By  contrast,  intracortical  BCIs  (iBCIs)  benefit  from  unparalleled  spatial  and  temporal  resolution  recordings  of  local  neuronal  ensembles,  resulting  in  some  of  the  highest-performance  communication  systems  to  date.  While  promising,  several  key  challenges  remain  for  wider  adoption  of  these  technologies.  First,  iBCIs  in  particular  suffer  from  signal  instability  that  cause  performance  degradation  across  time.  A  key  challenge  for  clinical  translation  of  these  iBCI  cursor  systems  is  ensuring  robust,  long-term  control  for  end  users  without  manual  retraining.  Second,  while  these  technologies  have  enabled  point-and-click  based  typing  interfaces  approaching  8-10  words  per  minute,  an  ideal  interface  would  match  the  bandwidth  of  conversational  speech  (roughly  150  words  per  minute).  Third,  intracortical  systems  require  brain  surgery,  which  has  inherent  risks  due  to  the  invasive  nature  of  the  procedure.  Developing  noninvasive  approaches  for  silent  speech  decoding  may  therefore  be  more  suitable  for  a  subset  of  patients.  In  this  work,  we  discuss  three  advances  that  tackle  these  key  areas  by  leveraging  modern  machine  learning  methods  alongside  high  signal-to-noise  (SNR)  recording  systems.  First,  we  present  an  unsupervised  recalibration  procedure  for  improving  cursor  BCI  robustness.  Using  data  from  our  clinical  trial  participant,  we  highlight  the  extent  and  timescales  of  neural  feature  drift.  We  demonstrate  how  existing  state-of-the-art  procedures  are  seemingly  ill-equipped  to  deal  with  long-term  drift  using  both  offline  data  as  well  as  simulation  models.  We  then  introduce  a  novel  procedure  that  leverages  task  structure  to  recalibrate  a  system  automatically,  and  demonstrate  superior  performance  in-silico  and  in  closed-loop  in  our  participant.  Second,  we  lay  the  groundwork  for  intracortical  speech  BCI  efforts  by  prototyping  a  system  in  an  offline  manner  using  microelectrode  arrays  in  dorsal  motor  cortex.  We  demonstrate  that,  despite  being  located  in  a  nontraditional  brain  area  for  speech  decoding,  our  arrays  provide  high  SNR  compared  to  existing  approaches.  Third,  we  leverage  skin-like  flexible  electronics  and  deep  learning  for  silent  speech  decoding  from  electromyography  (EMG)  signals.
■590    ▼aSchool  code:  0212.
■650  4▼aUser  training
■650  4▼aElectrodes
■650  4▼aBandwidths
■650  4▼aSignal  processing
■650  4▼aNeural  networks
■650  4▼aElectroencephalography
■650  4▼aAcoustics
■650  4▼aSpeech
■650  4▼aBrain  surgery
■650  4▼aNeurosciences
■653    ▼aBrain-computer  interfaces
■653    ▼aMachine  learning
■653    ▼aIntracortical  systems
■690    ▼a0986
■690    ▼a0800
■690    ▼a0317
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359263▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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