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Enhancing Usability in Hybrid Brain-Computer Interfaces: The Impact of Cognitive Fatigue

This presentation by Gérard Derosière explores the relationship between cognitive fatigue and the performance of hybrid brain-computer interfaces (hBCIs). BCIs allow control of electrical systems through cerebral activity, requiring sustained attention. The Time-On-Task (TOT) effect can decrease attentional resources, impacting classification accuracy. The session investigates how simultaneous hBCIs may produce early TOT effects and their implications for mental load. Proposed experiments will measure reaction times and accuracy across different BCI conditions, contributing to improved usability for users with cognitive limitations.

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Enhancing Usability in Hybrid Brain-Computer Interfaces: The Impact of Cognitive Fatigue

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  1. Improving Usability in Human Computer Interfaces: an investigation into cognitive fatigue and its influence on the performance of hybrid brain computer interfaces Presented by Gérard Derosière Directeur : Mr S. PERREY (PR). 06/14/2012

  2. I. Supervisors of the project and partners Codirection in the context of a PhDthesis :

  3. II. Introduction Brain-Computer Interfaces (BCIs): allow the control of an electrical system withoutvoluntarymovementneeded, just by the mean of the cerebralactivity(Gouy-Pailler, 2010). How isit possible? The user have to : - Do mental imagery or mental arithmetic; - Focus his attention to a light. Thesetasksrequiresustained attention. One main characteristic of the sustained attention:  The time-on-task (TOT) effect. Characterized by: - A progressive decrease of the attentional resources with time  measured through the increase of the reaction times (RTs) (Lim et al., 2010); - A modification of the cerebral activation (e.g., Paus et al., 1997)  non-stationarity. Attentionalresources

  4. II. Introduction TOT effect must be reduced during the use of a BCI for 2 reasons: - Decrease of attentional capacities  exhaustion, inability to use the BCI; - Modification of cerebral activation  ↓ of classification accuracy.  Proposed solutions (Baï et al., 2010): to develop BCIs requiring minimal training, and thus, less mental load • Allison et al. (2010): development of a simultaneoushBCI. • Event-RelatedDesynchronization (ERD): mental imagery. • Steady-State Visual EvokedPotential (SSVEP): focalization of attention to a light. Pfurtscheller et al. (2010): the hybridBCIs (hBCIs)  allow to enhance classification accuracy.  Enhancement of the classification accuracy in the simultaneous condition.

  5. III. Definition of the problematic • Summary •  BCIs require sustained attention; •  Sustained attention is characterized by a "Time-On-Task" effect; • TOT effect must be reduced during the use of a BCI; • A new type of BCI to enhance classification accuracy: the simultaneous hBCI; Incompatibility between simultaneous hBCI and the aim to reduce TOT effect. SimultaneoushBCIsrequiredivided attention  the mental load = higherthan a simple condition. Questions: - Does the simultaneous condition generate an early TOT effect? - If so, is it linked to an early modification of the cerebral activation? - Finally, does it generate an early decrease of the classification accuracy?

  6. IV. Proposedprotocol Comments: • Session 1: Mental arithmetic only • PASAT: Paced Auditory Serial Addition Test (mental arithmetic task). • RTs: Reaction times. • Concomitant measurements: • Electroencephalography (EEG), functional NIRS. Subjective aspects of fatigue. • Classification accuracy tested in the three conditions, in a monomadal and multimodal manner. PASAT PASAT PASAT PASAT ... RTs RTs RTs RTs RTs Time Session 2: Steady State Visual Evoked Potential (SSVEP) only SSVEP SSVEP SSVEP SSVEP ... RTs RTs RTs RTs RTs Time Session 3: hybrid condition SSVEP + PASAT SSVEP + PASAT SSVEP + PASAT SSVEP + PASAT ... RTs RTs RTs RTs RTs Time

  7. V. Expectedresults and conclusion Expectedresults: Tested in the threeconditons: Classification accuracy RTs Classification accuracy SSVEP + Mental arithmetic Multimodal (EEG+fNIRS) Mental arithmetic SSVEP Monomodal fNIRS Mental arithmetic SSVEP + Mental arithmetic Monomodal EEG SSVEP TOT TOT TOT Project partlyfinanced by the LABEX NUMEV  thiswillconduct to new development for pathological people.

  8. Thank you for your (sustained) attention. Directeur : Mr S. PERREY (PR).

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