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Decoding Inner Speech Using Electrocorticography: Progress and Challenges Toward a Speech Prosthesis

Stephanie Martin, Iñaki Iturrate, José del R. Millán, Robert T. Knight, Brian N. Pasley
2018 Frontiers in Neuroscience  
Despite intense efforts, investigating how the human cortex encodes inner speech remains an elusive challenge, due to the lack of behavioral and observable measures.  ...  People that cannot communicate due to neurological disorders would benefit from a system that can infer internal speech directly from brain signals.  ...  ACKNOWLEDGMENTS This article is adapted from the following doctorate thesis: Understanding and decoding imagined speech using intracranial recordings in the human brain (Martin, 2017) .  ... 
doi:10.3389/fnins.2018.00422 pmid:29977189 pmcid:PMC6021529 fatcat:s2b7sj7lvnhxnjsu5gviyycrt4

Human intracranial high-frequency activity during memory processing: neural oscillations or stochastic volatility?

John F Burke, Ashwin G Ramayya, Michael J Kahana
2015 Current Opinion in Neurobiology  
Two views have emerged to explain this effect: (1) HFA reflects a synchronous signal, related to underlying gamma oscillations, that plays a mechanistic role in human memory and (2) HFA reflects an asynchronous  ...  Intracranial high-frequency activity (HFA), which refers to fast fluctuations in electrophysiological recordings, increases during memory processing.  ...  We thank Katherine Hurley for her help in editing this manuscript.  ... 
doi:10.1016/j.conb.2014.09.003 pmid:25279772 pmcid:PMC4675136 fatcat:csp6d6yoqbbbvpifl5neug4nc4

Evidence for a deep, distributed and dynamic semantic code in human ventral anterior temporal cortex [article]

Timothy T Rogers, Christopher Cox, Qihong Lu, Akihiro Shimotake, Takayuki Kikuch, Takeharu Kunieda, Susumu Miyamoto, Ryosuke Takahashi, Akio Ikeda, Riki Matsumoto, Matthew A Lambon Ralph
2019 bioRxiv   pre-print
How does the human brain encode the meanings of words and objects? Most theories propose that local neural populations independently encode various semantic features.  ...  We introduce a technique for revealing a dynamically-changing distributed code in simulated neural data, then apply it to neural signals collected from human cortex while participants named line drawings  ...  Martin, GRAPES-Grounding representations in action, perception, and emotion 20 systems: How object properties and categories are represented in the human brain.Psychon.Bull.  ... 
doi:10.1101/695049 fatcat:43kqz7onbrauld74vwsi7qcbgm

Spatial clustering during memory search

Jonathan F. Miller, Eben M. Lazarus, Sean M. Polyn, Michael J. Kahana
2013 Journal of Experimental Psychology. Learning, Memory and Cognition  
In recalling a list of previously experienced items, participants are known to organize their responses on the basis of the items' semantic and temporal similarities.  ...  In Experiment 2, participants played a game in which they delivered objects to landmarks in a virtual environment and later recalled the delivered objects.  ...  Assuming that spatial attributes form an integral part of the item representations encoded in memory, one would expect to see spatial clustering even in tasks where participants are not instructed to encode  ... 
doi:10.1037/a0029684 pmid:22905933 pmcid:PMC8409224 fatcat:hhkcp67vrjaklisbdezc5c42b4

Memory Retrieval in Mice and Men

Aya Ben-Yakov, Yadin Dudai, Mark R. Mayford
2015 Cold Spring Harbor Perspectives in Biology  
These representations are driven largely by the activity patterns shaped during encoding, but are malleable, subject to the influence of time and interaction of the existing memory with novel information  ...  We review selected developments in the study of explicit retrieval in the rodent and human brain.  ...  These representations are driven largely by the activity during encoding, but they are malleable, subject to the influence of time, semantization, and interaction of the existing memory with novel information  ... 
doi:10.1101/cshperspect.a021790 pmid:26438596 pmcid:PMC4665077 fatcat:v2m6lp2lpba6pc3p7uht5xk34m

Uses, misuses, new uses and fundamental limitations of magnetic resonance imaging in cognitive science

Robert Turner
2016 Philosophical Transactions of the Royal Society of London. Biological Sciences  
When blood oxygenation level-dependent (BOLD) contrast functional magnetic resonance imaging (fMRI) was discovered in the early 1990s, it provoked an explosion of interest in exploring human cognition,  ...  The apparent fundamental limitations of all methods based on nuclear magnetic resonance are also discussed.  ...  (c) Sparse encoding versus population encoding ECoG studies in entorhinal cortex [116] show that individual neurons, each responsive to a wide range of visually presented examples of a single object  ... 
doi:10.1098/rstb.2015.0349 pmid:27574303 pmcid:PMC5003851 fatcat:qtcb4xhpj5g3le23ugxub62bzy

Human Intracranial Recordings and Cognitive Neuroscience

Roy Mukamel, Itzhak Fried
2012 Annual Review of Psychology  
Invasive brain recordings performed in patients during various clinical procedures provide a unique opportunity to record high-resolution signals in vivo from the human brain-data that are otherwise unavailable  ...  Of special value are the rare opportunities to record in awake humans the activity of single brain cells and small cellular assemblies.  ...  R.M. is supported by a career development award from the International Human Frontier Science Program Organization (HFSPO), and I.F. is supported by grants from the National Institute of Neurological Disorders  ... 
doi:10.1146/annurev-psych-120709-145401 pmid:21943170 fatcat:ocnk3fi5abaobd7k4tii2e7ro4

Neural mechanisms of selective attention in the somatosensory system

Manuel Gomez-Ramirez, Kristjana Hysaj, Ernst Niebur
2016 Journal of Neurophysiology  
Encoding of object curvature by tactile afferents from human fingers.  ...  Oscillatory sensory selection mechanisms during intersensory attention to rhythmic auditory and visual inputs: a human electrocorticographic investigation. J Neurosci 31: 18556 -18567, 2011.  ...  These two functional pathways are thought to operate in parallel and in concert during natural object grasping, manipulation, and recognition (Hsiao and Gomez-Ramirez 2011).  ... 
doi:10.1152/jn.00637.2015 pmid:27334956 pmcid:PMC5018055 fatcat:wzumgk5tifhhrjy35bucotopl4

Crowding is similar for eye movements and manual responses

F. Yildirim, F. W. Cornelissen
2014 Journal of Vision  
human ventral occipito-temporal cortex for object recognition Alan C -N Wong, Yetta Kwailing Wong 56.578 Decoding visual object representation in human parietal cortex Maryam Vaziri Pashkam, Yaoda Xu 56.579  ...  Kim, Yuka Sasaki, Takeo Watanabe 32.23, 11:15 am Object Representations in Human Visual Cortex are Flexible: an Associative Learning study.  ... 
doi:10.1167/14.10.789 fatcat:uxwzbzfhbjc3ddyfhbs2ilr4qe

Dynamic brain interactions during picture naming

Aram Giahi-Saravani, Kiefer J. Forseth, Nitin Tandon, Xaq Pitkow
2019 eNeuro  
We use an autoregressive Hidden Markov Model (ARHMM) to identify dynamical network states exhibited by electrocorticographic signals recorded from human neurosurgical patients.  ...  Here, we demonstrate that human brains exhibit a reliable sequence of neural interactions during speech production.  ...  This uniquely human ability requires visual processing, lexical semantic activation and selection, phonological encoding, and articulation.  ... 
doi:10.1523/eneuro.0472-18.2019 pmid:31196941 pmcid:PMC6624411 fatcat:6cksiz56gfaihe76qh25qb55mm

Inferior frontal oscillations reveal visuo-motor matching for actions and speech: evidence from human intracranial recordings

Pär Halje, Margitta Seeck, Olaf Blanke, Silvio Ionta
2015 Neuropsychologia  
We used electrocorticography to analyze oscillations recorded from intracranial electrodes in human fronto-parieto-temporal cortex during visuo-motor (executing or visually observing an action) and speech  ...  The neural correspondence between the systems responsible for the execution and recognition of actions has been suggested both in humans and non-human primates.  ...  Compatible with this proposal, it has been shown that properties of objects referring to actions (e.g. tools) are encoded in the motor system (Chao & Martin, 2000) , and that words addressing action-related  ... 
doi:10.1016/j.neuropsychologia.2015.08.015 pmid:26282276 fatcat:jjkcl5pygre6jpedd4mumhozje

EEG, MEG and neuromodulatory approaches to explore cognition: Current status and future directions

Carolina Beppi, Inês Ribeiro Violante, Gregory Scott, Stefano Sandrone
2021 Brain and Cognition  
Methodological challenges, recent developments and translational potential, along with future research avenues, are discussed.  ...  Neural oscillations and their association with brain states and cognitive functions have been object of extensive investigation over the last decades.  ...  Time-frequency EEG/MEG signal attributes are more easily interpretable compared to the ERPs, as the underlying neurophysiological mechanisms are better understood (Cohen, 2014; Helfrich & Knight, 2019  ... 
doi:10.1016/j.bandc.2020.105677 pmid:33486194 fatcat:c46jjqwninfqjnteu3pmngrrb4

Dynamic brain interactions during picture naming [article]

Aram Giahi Saravani, Kiefer J. Forseth, Nitin Tandon, Xaq Pitkow
2018 bioRxiv   pre-print
We use an autoregressive hidden Markov model to identify dynamical network states exhibited by electrocorticographic signals recorded from human neurosurgical patients.  ...  Here we demonstrate that human brains exhibit a reliable sequence of neural interactions during speech production.  ...  Acknowledgements We thank all the patients who participated in this study; laboratory members at the Tandon lab (Patrick Rollo and Jessica Johnson); neurologists at the Texas Comprehen-  ... 
doi:10.1101/478495 fatcat:4sqspvlsgvchxlqsft3h5ii72y

The Molecular and Systems Biology of Memory

Eric R. Kandel, Yadin Dudai, Mark R. Mayford
2014 Cell  
Most of our knowledge of the world and most of our skills are not innate but learned. Thus, we are who we are in large part because of what we have learned and what we remember and forget.  ...  In this Review, we examine the molecular, cellular, and circuit mechanisms that underlie how memories are made, stored, retrieved, and lost.  ...  during encoding.  ... 
doi:10.1016/j.cell.2014.03.001 pmid:24679534 fatcat:mh5q3d4u3rfhfmfz2werbpeap4

Dynamic Encoding of Speech Sequence Probability in Human Temporal Cortex

M. K. Leonard, K. E. Bouchard, C. Tang, E. F. Chang
2015 Journal of Neuroscience  
These statistics are a defining characteristic of one of the most important sequential signals humans encounter: speech.  ...  To address how speech sequence statistics are neurally encoded, we used high-resolution direct cortical recordings from human lateral superior temporal cortex as subjects listened to words and nonwords  ...  ., 2009 ) and that the recognition and encoding of stimuli in a sequence are closely related to the encoding of both prediction error and precision.  ... 
doi:10.1523/jneurosci.4100-14.2015 pmid:25948269 pmcid:PMC4420784 fatcat:atzqw3u4gvakjk77cexeaa4uce
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