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brain machine interface ppt


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brain machine interface ppt

  1. 1. BRAINCOMPUTER INTERFACE Presented By: Soumee sharmila pattnaik 1
  2. 2. In the futuristic vision of the Wachowskibrothers’movie trilogy “The Matrix”, humans dive into avirtual world by connecting their brains directly toa computer……..MOVIE FICTION: THE MATRIX 2
  3. 3. OVERVIEW.Definition.General Principle.Background.ComponenT.Simplified model of BCI.Training of BCI system.Present Development and Future.Applications.BCI for Healthy Users.Drawbacks.Computational ChallengesFuture Expansion.Conclusion 3
  4. 4. A BrainComputer Interface (BCI) is acollaborationin which abrian accepts and controls amechanicaldevice as anatural part of its 4
  5. 5. Signals from an array of neuronsread.Cerebral electric activityrecorded.Signals are amplified.Transmitted tocomputer Transformed todevicecontrol commands.Using computer chipsandprograms.Signals translated intoaction. 5
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  7. 7. The implantdevice,or chronicmulti-electrodearray.Thesignal recordingand processingsection.An externaldevicethe subjectuses toproduce &controlmotion.A feedbacksection tothesubject 7
  8. 8. Conduct electricity Biocompatible material(teflon) Chemically inertProvide the electricalcontactbetween the skin andtheEEG recording apparatus 8
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  10. 10. Two differentapproaches:.PatternRecognitionApproach.OperantConditioningApproachBLOCK DIAGRAM FOR 10LEARNING MODE
  11. 11. Development of BCI Early work: Algorithms to reconstruct movements from motor cortexneurons, which control movement were developed in 1970s.The first Intra-Cortical Brain- Computer Interface was built byimplanting neurotrophicconeelectrodes into monkeys.After conducting initial studies in rats during the 1990s, researchersdeveloped Brain Computer Interfaces that decoded brain activity in monkeys and used the devices to reproduce monkey movement in robotics arm.Present Developments:.BCI for Tereaplegics.Brain controlled Robot‘.BRAINGATE’ BCI.ATR HONDA’s new BCIBCI2000 11
  12. 12. BCI2000.BCI2000 is an open-source, general-purpose systemfor.BCIresearch.It can also be used for dataacquisition,stimulus presentation, andbrainmonitoring applications.During operation,.BCI2000 stores datain a common format (.BCI2000 native orGDF)..BCI2000 also includes several tools fordata importor conversion and exportfacilities into ASCII..BCI 12
  13. 13. BCI APPLICATIONS.Medicalapplications(restoration ofa communication channel forpatients with locked-in syndromeand the controlof neuroprosthesesin patientsaffected by spinal cord injuries ).Counter terrorism(10 times fasterimage search).multimedia and virtual reations.millitary applications 13
  14. 14. BCI FOR HEALTHY USERS.Induced disability.Ease of use inhardware.Ease of use in software.Otherwise unavailableinformation.Improved trainingorperformance.Confidentiality.Speed.Novelty. 14
  15. 15. DRAWBACKS.EEGs measure tiny voltage potentials. The signal is weak andprone to interference..Each neuron is constantlysending andreceivinG signals throuh a complex web of connections.. There are chemical processesinvolved as well, which EEGscant pick up on..The equipment heavy(~10 lbs.)& hencenot portable. 15
  16. 16. COMPUTATIONAL CHALLENGES ANDFUTURE IMPLEMENTATIONS .Minimally invasive surgical methods. .Next generation Neuroprosthesis. .Vision prosthesis. .BCI for totally paralyzed. .Minimal number of calibration trials. .Development of telemetry chip to collect data without external cables. 16
  17. 17. CONCLUSION.A potentialtherapeutic tool..BCI System isnominated for theEuropean ICT Grandprice..Potentially highimpact technology. 17
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