20 results on '"Fabien Lotte"'
Search Results
2. Ecological decoding of visual aesthetic preference with oscillatory electroencephalogram features—A mini-review
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Marc Welter and Fabien Lotte
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Electroencephalography (EEG) ,brain-computer-interfaces ,neuroaesthetics ,aesthetic preference ,oscillatory activity ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
In today's digital information age, human exposure to visual artifacts has reached an unprecedented quasi-omnipresence. Some of these cultural artifacts are elevated to the status of artworks which indicates a special appreciation of these objects. For many persons, the perception of such artworks coincides with aesthetic experiences (AE) that can positively affect health and wellbeing. AEs are composed of complex cognitive and affective mental and physiological states. More profound scientific understanding of the neural dynamics behind AEs would allow the development of passive Brain-Computer-Interfaces (BCI) that offer personalized art presentation to improve AE without the necessity of explicit user feedback. However, previous empirical research in visual neuroaesthetics predominantly investigated functional Magnetic Resonance Imaging and Event-Related-Potentials correlates of AE in unnaturalistic laboratory conditions which might not be the best features for practical neuroaesthetic BCIs. Furthermore, AE has, until recently, largely been framed as the experience of beauty or pleasantness. Yet, these concepts do not encompass all types of AE. Thus, the scope of these concepts is too narrow to allow personalized and optimal art experience across individuals and cultures. This narrative mini-review summarizes the state-of-the-art in oscillatory Electroencephalography (EEG) based visual neuroaesthetics and paints a road map toward the development of ecologically valid neuroaesthetic passive BCI systems that could optimize AEs, as well as their beneficial consequences. We detail reported oscillatory EEG correlates of AEs, as well as machine learning approaches to classify AE. We also highlight current limitations in neuroaesthetics and suggest future directions to improve EEG decoding of AE.
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- 2024
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3. A large EEG database with users’ profile information for motor imagery brain-computer interface research
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Pauline Dreyer, Aline Roc, Léa Pillette, Sébastien Rimbert, and Fabien Lotte
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Science - Abstract
Abstract We present and share a large database containing electroencephalographic signals from 87 human participants, collected during a single day of brain-computer interface (BCI) experiments, organized into 3 datasets (A, B, and C) that were all recorded using the same protocol: right and left hand motor imagery (MI). Each session contains 240 trials (120 per class), which represents more than 20,800 trials, or approximately 70 hours of recording time. It includes the performance of the associated BCI users, detailed information about the demographics, personality profile as well as some cognitive traits and the experimental instructions and codes (executed in the open-source platform OpenViBE). Such database could prove useful for various studies, including but not limited to: (1) studying the relationships between BCI users’ profiles and their BCI performances, (2) studying how EEG signals properties varies for different users’ profiles and MI tasks, (3) using the large number of participants to design cross-user BCI machine learning algorithms or (4) incorporating users’ profile information into the design of EEG signal classification algorithms.
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- 2023
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4. Correction: Predicting Mental Imagery-Based BCI Performance from Personality, Cognitive Profile and Neurophysiological Patterns.
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Camille Jeunet, Bernard N'Kaoua, Sriram Subramanian, Martin Hachet, and Fabien Lotte
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Medicine ,Science - Abstract
[This corrects the article DOI: 10.1371/journal.pone.0143962.].
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- 2023
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5. Riemannian Channel Selection for BCI With Between-Session Non-Stationarity Reduction Capabilities
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Khadijeh Sadatnejad and Fabien Lotte
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Brain-computer interfaces ,EEG ,Riemannian manifold ,channel selection ,non-stationarity ,Medical technology ,R855-855.5 ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Objective: Between-session non-stationarity is a major challenge of current Brain-Computer Interfaces (BCIs) that affects system performance. In this paper, we investigate the use of channel selection for reducing between-session non-stationarity with Riemannian BCI classifiers. We use the Riemannian geometry framework of covariance matrices due to its robustness and promising performances. Current Riemannian channel selection methods do not consider between-session non-stationarity and are usually tested on a single session. Here, we propose a new channel selection approach that specifically considers non-stationarity effects and is assessed on multi-session BCI data sets. Methods: We remove the least significant channels using a sequential floating backward selection search strategy. Our contributions include: 1) quantifying the non-stationarity effects on brain activity in multi-class problems by different criteria in a Riemannian framework and 2) a method to predict whether BCI performance can improve using channel selection. Results: We evaluate the proposed approaches on three multi-session and multi-class mental tasks (MT)-based BCI datasets. They could lead to significant improvements in performance as compared to using all channels for datasets affected by between-session non-stationarity and to significant superiority to the state-of-the-art Riemannian channel selection methods over all datasets, notably when selecting small channel set sizes. Conclusion: Reducing non-stationarity by channel selection could significantly improve Riemannian BCI classification accuracy. Significance: Our proposed channel selection approach contributes to make Riemannian BCI classifiers more robust to between-session non-stationarities.
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- 2022
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6. Retrospective on the First Passive Brain-Computer Interface Competition on Cross-Session Workload Estimation
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Raphaëlle N. Roy, Marcel F. Hinss, Ludovic Darmet, Simon Ladouce, Emilie S. Jahanpour, Bertille Somon, Xiaoqi Xu, Nicolas Drougard, Frédéric Dehais, and Fabien Lotte
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benchmarking ,dataset ,passive brain-computer interface ,workload ,EEG ,cross-session variability ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
As is the case in several research domains, data sharing is still scarce in the field of Brain-Computer Interfaces (BCI), and particularly in that of passive BCIs—i.e., systems that enable implicit interaction or task adaptation based on a user's mental state(s) estimated from brain measures. Moreover, research in this field is currently hindered by a major challenge, which is tackling brain signal variability such as cross-session variability. Hence, with a view to develop good research practices in this field and to enable the whole community to join forces in working on cross-session estimation, we created the first passive brain-computer interface competition on cross-session workload estimation. This competition was part of the 3rd International Neuroergonomics conference. The data were electroencephalographic recordings acquired from 15 volunteers (6 females; average 25 y.o.) who performed 3 sessions—separated by 7 days—of the Multi-Attribute Task Battery-II (MATB-II) with 3 levels of difficulty per session (pseudo-randomized order). The data -training and testing sets—were made publicly available on Zenodo along with Matlab and Python toy code (https://doi.org/10.5281/zenodo.5055046). To this day, the database was downloaded more than 900 times (unique downloads of all version on the 10th of December 2021: 911). Eleven teams from 3 continents (31 participants) submitted their work. The best achieving processing pipelines included a Riemannian geometry-based method. Although better than the adjusted chance level (38% with an α at 0.05 for a 3-class classification problem), the results still remained under 60% of accuracy. These results clearly underline the real challenge that is cross-session estimation. Moreover, they confirmed once more the robustness and effectiveness of Riemannian methods for BCI. On the contrary, chance level results were obtained by one third of the methods—4 teams- based on Deep Learning. These methods have not demonstrated superior results in this contest compared to traditional methods, which may be due to severe overfitting. Yet this competition is the first step toward a joint effort to tackle BCI variability and to promote good research practices including reproducibility.
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- 2022
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7. Editorial: Long Term User Training and Preparation to Succeed in a Closed-Loop BCI Competition
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Gernot R. Müller-Putz, Damien Coyle, Fabien Lotte, Jing Jin, and David Steyrl
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Brain-Computer Interface ,electroencephalogram ,transfer learning ,user learning ,user-centered training ,closed-loop learning ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Published
- 2022
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8. Prediction of Motor-Imagery-BCI performance using Median Nerve Stimulation.
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Sébastien Rimbert, Valérie Marissens Cueva, Laurent Bougrain, and Fabien Lotte
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- 2024
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9. Modeling Complex EEG Data Distribution on the Riemannian Manifold Toward Outlier Detection and Multimodal Classification.
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Maria Sayu Yamamoto, Khadijeh Sadatnejad, Toshihisa Tanaka, Md. Rabiul Islam 0003, Frédéric Dehais, Yuichi Tanaka 0001, and Fabien Lotte
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- 2024
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10. Novel SPD Matrix Representations Considering Cross-Frequency Coupling for EEG Classification Using Riemannian Geometry.
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Maria Sayu Yamamoto, Apolline Mellot, Sylvain Chevallier, and Fabien Lotte
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- 2023
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11. Impact of the baseline temporal selection on the ERD/ERS analysis for Motor Imagery-based BCI.
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Sébastien Rimbert, David Trocellier, and Fabien Lotte
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- 2023
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12. ERD modulations during motor imageries relate to users' traits and BCI performances.
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Sébastien Rimbert and Fabien Lotte
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- 2022
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13. Class-distinctiveness-based frequency band selection on the Riemannian manifold for oscillatory activity-based BCIs: preliminary results.
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Maria Sayu Yamamoto, Fabien Lotte, Florian Yger, and Sylvain Chevallier
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- 2022
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14. Identifying factors influencing the outcome of BCI-based post stroke motor rehabilitation towards its personalization with Artificial Intelligence.
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David Trocellier, Bernard N'Kaoua, and Fabien Lotte
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- 2022
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15. Is Event-Related Desynchronization variability correlated with BCI performance?
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Sébastien Rimbert, David Trocellier, and Fabien Lotte
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- 2022
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16. Towards Identifying Optimal Biased Feedback for Various User States and Traits in Motor Imagery BCI.
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Jelena Mladenovic, Jérémy Frey, Smeety Pramij, Jérémie Mattout, and Fabien Lotte
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- 2022
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17. Simple Probabilistic Data-driven Model for Adaptive BCI Feedback
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Jelena Mladenović, Fabien Lotte, Jérémie Mattout, Jérémy Frey, Computer Science Faculty RAFLab, Union University, Belgrade (RAF), Popular interaction with 3d content (Potioc), Laboratoire Bordelais de Recherche en Informatique (LaBRI), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS), Université de Bordeaux (UB), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (CRNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), CIC CHU Lyon (inserm), Université de Lyon-Université de Lyon-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Lyon, Ullo, ERC BrainConquest, European Project: 714567 ,H2020 Pilier ERC,BrainConquest(2017), Mladenovic, Jelena, and Boosting Brain-Computer Communication with high Quality User Training - BrainConquest - - H2020 Pilier ERC2017-07-01 - 2022-06-30 - 714567 - VALID
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[INFO.INFO-AI] Computer Science [cs]/Artificial Intelligence [cs.AI] ,[INFO.INFO-SY] Computer Science [cs]/Systems and Control [cs.SY] ,Dynamic Behaviour ,[INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing ,Adaptive modeling ,EEG Signal ,[SCCO.COMP]Cognitive science/Computer science ,[INFO.INFO-LG] Computer Science [cs]/Machine Learning [cs.LG] ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI] ,[INFO.EIAH] Computer Science [cs]/Technology for Human Learning ,[INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG] ,[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing ,[SCCO.COMP] Cognitive science/Computer science ,[INFO.INFO-SY]Computer Science [cs]/Systems and Control [cs.SY] ,[INFO.EIAH]Computer Science [cs]/Technology for Human Learning ,[INFO.INFO-MO] Computer Science [cs]/Modeling and Simulation ,[INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC] ,[INFO.INFO-HC] Computer Science [cs]/Human-Computer Interaction [cs.HC] ,Brain-computer interfaces BCI - Abstract
International audience; Due to abundant signal and user variability among others, BCIs remain difficult to control. To increase performance, adaptive methods are a necessary means to deal with such a vast spectrum of variable data. Typically, adaptive methods deal with the signal or classification corrections (adaptive spatial filters [1], co-adaptive calibration [2], adaptive classifiers [3]). As such, they do not necessarily account for the implicit alterations they perform on the feedback (in real-time), and in turn, on the user, creating yet another potential source of unpredictable variability. Namely, certain user's personality traits and states have shown to correlate with BCI performance, while feedback can impact user states [4]. For instance, altered (biased) feedback was distorting the participants' perception over their performance, influencing their feeling of control, and online performance [5]. Thus, one can assume that through feedback we might implicitly guide the user towards a desired state beneficial for BCI performance. We propose a novel, simple probabilistic, data-driven dynamic model to provide such feedback that will maximize performance.
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- 2022
18. Riemannian Channel Selection for BCI With Between-Session Non-Stationarity Reduction Capabilities
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Fabien Lotte, Khadijeh Sadatnejad, Popular interaction with 3d content (Potioc), Laboratoire Bordelais de Recherche en Informatique (LaBRI), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), and European Project: 714567 ,H2020 Pilier ERC,BrainConquest(2017)
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General Neuroscience ,MESH: channel selection ,Rehabilitation ,Biomedical Engineering ,Electroencephalography ,[INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI] ,[INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG] ,[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing ,MESH: non-stationarity ,Brain-Computer Interfaces ,MESH: EEG ,MESH: Brain-computer interfaces ,Internal Medicine ,MESH: Riemannian manifold ,Humans ,[MATH.MATH-AG]Mathematics [math]/Algebraic Geometry [math.AG] ,[INFO.INFO-BT]Computer Science [cs]/Biotechnology ,Algorithms - Abstract
L'institution a financé les frais de publication pour que cet article soit en libre accès; International audience; Objective: Between-session non-stationarity is a major challenge of current Brain-Computer Interfaces (BCIs) that affects system performance. In this paper, we investigate the use of channel selection for reducing between-session non-stationarity with Riemannian BCI classifiers. We use the Riemannian geometry framework of covariance matrices due to its robustness and promising performances. Current Riemannian channel selection methods do not consider between-session non-stationarity and are usually tested on a single session. Here, we propose a new channel selection approach that specifically considers non-stationarity effects and is assessed on multi-session BCI data sets. Methods: We remove the least significant channels using a sequential floating backward selection search strategy. Our contributions include: 1) quantifying the non-stationarity effects on brain activity in multi-class problems by different criteria in a Riemannian framework and 2) a method to predict whether BCI performance can improve using channel selection. Results: We evaluate the proposed approaches on three multi-session and multi-class mental tasks (MT)-based BCI datasets. They could lead to significant improvements in performance as compared to using all channels for datasets affected by between-session non-stationarity and to significant superiority to the state-of-the-art Riemannian channel selection methods over all datasets, notably when selecting small channel set sizes. Conclusion: Reducing non-stationarity by channel selection could significantly improve Riemannian BCI classification accuracy. Significance: Our proposed channel selection approach contributes to make Riemannian BCI classifiers more robust to between-session non-stationarities.
- Published
- 2022
19. Les interfaces-cerveau ordinateur
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Fabien Lotte
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03 medical and health sciences ,Behavioral Neuroscience ,0302 clinical medicine ,Neuropsychology and Physiological Psychology ,030228 respiratory system ,Neurology ,Cognitive Neuroscience ,Neurology (clinical) ,030217 neurology & neurosurgery - Published
- 2021
20. Contribution à la compréhension des performances BCI basées sur les tâches mentales à l’aide de modèles computationnels prédictifs
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Benaroch, Camille, Laboratoire Bordelais de Recherche en Informatique (LaBRI), Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS), Inria Bordeaux - Sud-Ouest, Institut National de Recherche en Informatique et en Automatique (Inria), Université de Bordeaux, Fabien Lotte, and Camille Jeunet
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Brain computer interfaces ,Neurophysiologie ,ElectroEncéphaloGraphie ,Traitement de Données ,ElectroEncephaloGraphy ,Neurophysiology ,Computational modeling ,Modélisation Computationnelle ,Classification ,User Training ,Learning ,Interface cerveau ordinateur ,[INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC] ,Entraînement Utilisateur - Abstract
Brain computer interfaces (BCIs) are communication and control tools that enable their users to interact with computer by using brain activity alone (which is measured, most of the time, using electroencephalography - EEG). A prominent type of BCI is mental task (MT) based BCIs, that translate modifications in brain activity induced by MTs performed by the user (e.g., imagination of movements, mental calculation or mental rotation of an object among others) into control commands for a computer. Using an MT-BCI requires dedicated training. Indeed, the user has to generate stable and distinct brain signals for each task otherwise they will not be able to control the system. Indeed, the system will not be able to recognize which task the user is performing. Producing such brain signals is a skill to be acquired and mastered and the more the user practices the better he/she will get at it. The objective of my PhD project is to contribute to the understanding of BCI user training by first doing an experimental study of learning by participating in the CYBATHLON competition. We proposed and evaluated the design of a multi-class MT-based BCI for longitudinal training of a tetraplegic user with a newly designed machine learning pipeline based on adaptive Riemannian classifiers. Using a newly proposed BCI user learning metric, we could show that our user learned to improve his BCI control by producing EEG signals matching increasingly more the BCI classifier training data distribution, rather than by improving his EEG class discrimination. In addition, this study revealed the difficulty of setting up a reliable protocol dedicated to a long term BCI training. The second part of this work is dedicated to the understanding of MT-BCI performances using predictive computational models. We proposed various computational models of BCI user training that could predict the performances of various BCI users over training time, based on BCI systems component. As a BCI is a communication system between a user and a machine such components were related to the user-profile related characteristics but also factors extracted from machine-learning algorithms used to build the system classifier. Our results suggested that is was possible to predict BCI performances using neurophysiological characteristics of a user but also neurophysiological characteristics combined with stable characteristics (i.e., traits) or the user. In addition, our studies revealed that studying features extracted from data-driven methods could be interesting to better understand why some subjects have difficulties controlling a BCI. Indeed, reliable models of BCI performances were revealed using such features.; Les interfaces cerveau-ordinateur (ICO) sont des outils de communication et de contrôle qui permettent à leurs utilisateurs d’interagir avec un ordinateur via leur activité cérébrale (mesurée, généralement, à l’aide de l’électroencéphalographie - EEG). Une catégorie prometteuse d’ICO est l’ICO basée sur les tâches mentales (TM). Les TM-ICO utilisent les modifications de l’activité cérébrale induites par les TM effectuées par l’utilisateur (par exemple, l’imagination de mouvements, le calcul mental ou la rotation mentale d’un objet) pour les transformer en commandes de contrôle. Contrôler une TM-ICO nécessite l’acquisition de compétences et donc un entraînement approprié. En effet, l’utilisateur doit générer des signaux cérébraux stables et distincts pour chaque tâche, faute de quoi il ne sera pas en mesure de contrôler le système. En effet, le système ne sera pas en mesure de reconnaître quelle tâche l’utilisateur est en train d’effectuer. Produire de tels signaux cérébraux est une compétence à acquérir et à maîtriser. L’objectif de cette thèse est de contribuer à la compréhension de l’entraînement des utilisateurs d’ICO en réalisant d’abord une étude expérimentale de l’apprentissage. Dans une première partie, nous avons proposé et évalué la conception d’une TM-ICO multi-classes pour entrainer un utilisateur tétraplégique sur le long terme. Nou avons utilisé une nouvelle méthode de classification: les classifieurs riemanniens adaptatifs. Nous avons également observé que notre pilote a appris à améliorer l’ICO en produisant des signaux EEG correspondant de plus en plus à la distribution des données d’entraînement du classificateur, plutôt qu’en améliorant à discriminer ses signaux. Cette étude nous a également permis de constater la difficulté de la mise en place d’un protocole fiable dédié à un entraînement ICO à long terme. La seconde partie de notre travail est consacrée à la compréhension des performances des TM-ICO à l’aide de modèles computationnels prédictifs. Nous avons proposé différents modèles pouvant prédire les performances de différents utilisateurs de ICO au cours de l’entraînement basés sur des caractéristiques liées aux ICO. Comme une ICO est un système de communication entre un utilisateur et une machine, ces caractéristiques sont liés à la fois au profil de l’utilisateur at aux facteurs extraits d’algorithmes utilisés pour construire/calibrer le système. Nos résultats suggèrent qu’il est possible de prédire les performances des utilisateurs d’ICO en utilisant les caractéristiques neurophysiologiques d’un utilisateur, mais aussi les caractéristiques neurophysiologiques combinées à des caractéristiques stables (des traits) de l’utilisateur. De plus, nos études ont révélé que l’étude des caractéristiques extraites des méthodes utilisées pour construire/calibrer le système pourraient être intéressantes pour mieux comprendre pourquoi certains sujets ont des difficultés à contrôler une ICO. En effet, des modèles fiables de performances ont été révélés en utilisant de telles caractéristiques.
- Published
- 2021
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