ALIAS WP5 Results

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ALIAS WP5 Results

  1. 1. WP 5 PresentationChristoph Hintermüller (g.tec)
  2. 2. Proposed Structure for the Talk• goals• achievements• problems• outlook/ future work• lessons learned• list of publications11.06.2013 WP 5 Presentation 2
  3. 3. Goals• Develop an EEG based brain-computer interface forrobot control• Usage of the BCI system for goal oriented andcontinuous control• Test the BCI system for different applications11.06.2013 WP 5 Presentation 3
  4. 4. Goals11.06.2013 WP 5 Presentation 4• MilestonesM3: First release of BCI (Month 12)M4: First ALIAS pilot (Month 12)M7: Second ALIAS pilot (Month 24)M9: Final ALIAS pilot (Month 35)• DeliverablesD5.1: Rapid Prototyping Environment (Month 6)D5.2: BCI System (Month 12)D5.3: Tests of the BCI System with the Robot (Month 36)• GanttY1 Y2 Y3Task 1 2 1 2 1 2305. Jan Setup Rapid Prototyping D5.105. Feb Development of P100, SSVEP and oscillatroy BCI D5.205. Mrz Interfacing BCI system to robot D5.305. Apr BCI system tests with robot D5.3Milestones M3,4 M7 M9ActivityWP5 Brain Computer Interface
  5. 5. Achievements11.06.2013 WP 5 Presentation 5• 2 x g.MOBIlab 8 channel devices including EEG cap,active electrodes, Matlab Simulink BCI Models(SSVEP, P300), g.BSanalyze, EEG processingtoolboxes• Installed at Fraunhofer FhG, g.tec, Jade
  6. 6. Achievements11.06.2013 WP 5 Presentation 6• First dry electrode system that works for motor imagery, SSVEP andP300 (same accuracies reached for all)• Whole frequency range available: 0.1-40 Hz• First dry electrode system that covers extended 10/20 system onfrontal, central, parietal and occipital sites• More low frequency components in the EEG spectrum below 3 Hz• Careful montage required and more sensitive to surrounding noise• Group studies submitted in March 2011 to Journal of NeuralEngineering and BCI conference in Graz 2011.
  7. 7. Achievements: SSVEP P-Statistics11.06.2013 WP 5 Presentation 7• Rectification of SNR signals tozero sample median.• Soft-Max transformation used to estimate probabilities p• Sample assigned to Virtual Zero Class if 1 – p < Confidence interval
  8. 8. Achievements: P300 decisions using p-statistic• Online selection of # of flashes: p-statistics based• Residual error limits: 0.15% decision, 25% P300 validation• Minimum 2, maximum 15, average 7 flashes11.06.2013 WP 5 Presentation 8min mean max min mean max min mean maxoff 2,33 6,94 14,11 6,00 7,33 9,33 3,17 6,58 9,6730,00 2,44 7,11 14,78 7,67 7,67 7,67 3,56 6,51 10,2225,00 2,44 7,11 14,78 5,00 6,33 9,00 3,78 7,13 10,5620,00 2,44 7,22 14,44 5,00 6,93 9,00 3,44 7,02 10,7815,00 2,44 7,16 14,44 3,33 8,06 12,00 3,44 7,06 10,5610,00 2,44 6,80 14,00 4,33 6,13 8,33 3,33 7,56 12,445,00 3,56 7,33 14,00 5,57 6,43 7,29 4,22 8,64 12,222,50 3,67 7,14 13,67 5,17 8,39 11,67 4,33 9,00 13,561,00 4,11 7,06 12,11 6,71 8,79 10,86 4,22 8,57 13,560,50 3,25 5,71 10,13 5,86 7,93 10,00 4,56 8,22 12,890,10 5,43 6,52 8,57 2,80 5,40 8,00 4,56 8,03 12,56TTPFTPFPTrue positive selectionPositiv selection, false assignmentFalse Positiv selectionTotal spelled 28 charTotal ignored 28 charResidal ErrorProbability [%]ParametersconsideredAverage Values: count(p>1-r) = 1# RepetitionsP3selectionerrorprobability[%]0,15TTP FTP FP
  9. 9. Achievements: BCI ACTOR11.06.2013 WP 5 Presentation 9Network (UDP)CommunicationInterfaceStructure• General structure– UI is controlled with the BCI system( MI BCI, SSVEP BCI, P300 BCI)– AIM: Adaptive Interface Module• Grouping of applications• Receives real time updates• Prepares information for UI– Application group: applications controlled byone network node (e.g. Home Automation)• XML string from UDP message or local file– Mask layout and structure– ICONs– Command Types and Instructions• Initialized via UDP socket
  10. 10. Achievements: BCI ACTOR11.06.2013 WP 5 Presentation 10MaskDescriptionChat MaskContact Mask
  11. 11. Achievements: Integration• with Dialog Manager• with Gui11.06.2013 WP 5 Presentation 11Component/Service Status ParadigmEntertainment YesP300Games YesAudio Books YesTV YesWII Switching to WIICommunication YesSkype outgoing call YesSkype incoming call Yes/SchiedlbergInitiate emergencycallYesWeb-browser Loading browserCall/Dismiss No/2013SSVEPDirect emergency call No/2013Cancel emergency call No/2013Paradigm SOCI BCIprocessingIntegratedP300 singlecharacterYesYes YESP300 rowcolumnNoYes -SSVEPonscreenYesYes -SSVEPLED-Yes No
  12. 12. Achievements: Fieldtrials 201211.06.2013 WP 5 Presentation 12
  13. 13. Problems11.06.2013 WP 5 Presentation 13
  14. 14. Outlook / Future Work• Ongoing developments• Integration signal check module• Combination: accuracy based selection of optimal # of flashesand p-statistics• SOCI multi line text• SOCI icon size independent of mask size and window size• SOCI support for greyscale, color Icons• SOCI elimination shared network drive• ACTOR protocol improvements and speedup• User tests• Munich in coordination with TUM• Only tested with ALIAS members11.06.2013 WP 5 Presentation 14
  15. 15. Lessons Learned11.06.2013 WP 5 Presentation 15
  16. 16. List of Publications• Papers, Book Chapters• C. Guger, G. Krausz, B. Allison, G. Edlinger (2012): Comparison of dry and gel basedelectrodes for P300 brain–computer interfaces. Front. Neurosci. 6 :60. doi:10.3389/fnins.2012.00060.• Fazel-Rezai R, Allison BZ, Guger C, Sellers EW, Kleih SC and Kübler A (2012): P300 braincomputer interface: current challenges and emerging trends. Front. Neuroeng. 5:14. doi:10.3389/fneng.2012.00014• J.A. Wilson; C. Guger, G. Schalk: BCI Hardware and Software. In Jonathan R. Wolpaw,Elizabeth Winter Wolpaw (2012): Brain-Computer Interfaces: Principles and Practice. Edited by:Jonathan R. Wolpaw, Elizabeth Winter Wolpaw. Publisher: Oxford Univ Pr. Publication Date: 1.Edition, January 24, 2012. ISBN: 978-0-195-38885-5.• Lechner, R. Ortner, F. Aloise, R. Prueckl, F. Schettini, V. Putz, J. Scharinger, E. Opisso, U.Costa, J. Medina, C. Guger (2012): Comparing the accuracy of a P300 speller for people withmajor physical disability. In Proceedings of ICCHP. July 11 – 13,2012. Linz, AT.• C. Hintermüller, C. Kapeller, G. Edlinger, C. Guger, BCI Integration: Application Interfaces, InBrain Computer Interface, Edited by: Fazel-Razi, Intech, 2013, ISBN 980-953-307-960-3• Fares/Conferences• IEEE Biorob 2012, Rom, IT. June 24 – 28, 2012.• Measuring Behaviour 2012. Aug 28 – 31, 2012. Utrecht, NL• Joint Annual Meeting ECNS - ISNIP - ISBET – EPIC. Sep 12 – 16, 2012. Bristol, TN, US.11.06.2013 WP 5 Presentation 16

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