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Introduction to
Brain Computer
Interface
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Brain Computer Interface
• Communication using T...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
BCI defined
• A BCI generally consists of three ...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
BCI Defined (Continued)
BCI Types:
– Invasive
– ...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Three BCI Subtypes
• Active BCI: “An active BCI ...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Introduction to EEG
• Electroencephalography (EE...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Anatomy
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Functional Mapping
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Volume Conduction
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Why is BCI Hard
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Why is BCI Hard?
• Signal-to-noise ratio is very...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Reason for Variability
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Consequences
• Sophisticated signal processing i...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Underlying Neural Process
• Largest contributors...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
When would 50,000 neurons fire
near-synchronousl...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Signal Detectability
• Root cause might not be
d...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Electrode Placement
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Types of Electrodes
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
EEG Sensor Designs
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
EEG Sensor Designs
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
EEG Sensor Designs
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Electrode Position
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
10-10 Electrode System
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Signal Range
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Comparison of EEG Bands
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Available Tools
• Opensig
• BCI2000
• EEGLAB
• O...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Communication and Control for the
Severely disab...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Neurospeller
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Operator Monitoring
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Operator Monitoring
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Forensics-LIE Detection
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Entertainment
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Health
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
NeuroMarketing
• Impact of Advt
,movies is measu...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Neuroscience
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
Mindwave Mobile vs Mindwave
BRAIN SENSOR
EAR CLI...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
HEADSET PLACEMENT
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
FEATURES
• Single Sensor on FP1
• Can detect mul...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
SPECIFICATIONS
• Bluetooth ™ Wireless communicat...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
THINKGEAR
•TGAM MODULE offers e-Sense technology...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
SUPPORTED PLATFORMS
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
MINDBOT
SPECIFICATIONS:
• Micro Controller : 805...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
MINDBOT
BLUETOOTH UART
UART
ZIGBEE MODULE
SENSES...
Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
For more details
– www.pantechsolutions.net
– ht...
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Introduction to Brain Computer Interface

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Introduction to brain computer interface

Publicada em: Educação, Tecnologia, Espiritual

Introduction to Brain Computer Interface

  1. 1. Introduction to Brain Computer Interface
  2. 2. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Brain Computer Interface • Communication using Thoughts of Brain (EEG) without using any Muscle control, Especially for Severely Paralyzed people
  3. 3. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. BCI defined • A BCI generally consists of three main components: 1. A Signal-acquisition module (Electrode,Filtering and Amplifier) 2. A Signal-processing module(ASIC ,DSP) 3. A Control module ( Microcontroller &Driver)
  4. 4. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. BCI Defined (Continued) BCI Types: – Invasive – Involves attaching electrodes directly to the brain tissue – The patient’s brain gradually adapts its signals to be sent through the electrodes – Non-invasive Involves putting electrodes on the scalp of the patient, and taking readings
  5. 5. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Three BCI Subtypes • Active BCI: “An active BCI is a BCI which derives its outputs from brain activity which is directly consciously controlled by the user, independently from external events, for controlling an application.” • Reactive BCI: “A reactive BCI is a BCI which derives its outputs from brain activity arising in reaction to external stimulation, which is indirectly modulated by the user for controlling an application.” • Passive BCI: “A passive BCI is a BCI which derives its outputs from arbitrary brain activity without the purpose of voluntary control, for enriching a human-computer interaction with implicit information.”
  6. 6. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Introduction to EEG • Electroencephalography (EEG) is the recording of electrical activity along the scalp. EEG measures voltage fluctuations resulting from ionic current flows within the neurons of the brain • German physiologist and psychiatrist Hans Berger (1873–1941) recorded the first human EEG in 1924
  7. 7. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Anatomy
  8. 8. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
  9. 9. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Functional Mapping
  10. 10. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Volume Conduction
  11. 11. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Why is BCI Hard
  12. 12. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Why is BCI Hard? • Signal-to-noise ratio is very challenging, so sensitive measures are hard to obtain • –Relevant brain activity is small compared to interfering artifacts and compared to brain background activity • Specific measures are even harder to obtain (with coarse-grained sensing) • Large collections of neurons are involved in many different activities, not just one • Underlying phenomena are also highly diverse and rich and derived measures are still poorly understood – not always clear what to look for
  13. 13. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Reason for Variability
  14. 14. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Consequences • Sophisticated signal processing is required • BCI systems must be calibrated before they can be used • Calibration should entail as much information as available, e.g., example data, prior knowledge, large databases
  15. 15. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Underlying Neural Process • Largest contributors to the EEG are the pyramidal cells • Radially oriented in the cortex (orthogonal to the surface) • Electromagnetic fields of co-aligned and co-activated neurons add up • EEG, MEG and ECoG can only detect large-scale neural dynamics , For example, 50.000 neurons firing in near- synchrony
  16. 16. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. When would 50,000 neurons fire near-synchronously? • –An external event triggers a cascade of related neural processes (e.g., in perception) • –An internal event triggers a cascade of related neural processes (e.g., sudden “aha!”) • –Neural populations enter a synchronized steady- state firing pattern (e.g., idle oscillations) • Event-Related Potentials (ERPs) and Oscillatory Processes are the two major BCI-detectable EEG
  17. 17. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Signal Detectability • Root cause might not be directly observable (e.g., dopaminergic system, deep brain structures, few neurons) • Electromagnetic fields can cancel each other out
  18. 18. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Electrode Placement
  19. 19. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Types of Electrodes
  20. 20. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. EEG Sensor Designs
  21. 21. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. EEG Sensor Designs
  22. 22. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. EEG Sensor Designs
  23. 23. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Electrode Position
  24. 24. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. 10-10 Electrode System
  25. 25. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Signal Range
  26. 26. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Comparison of EEG Bands
  27. 27. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Available Tools • Opensig • BCI2000 • EEGLAB • Open VIBE • BCILAB
  28. 28. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Communication and Control for the Severely disabled
  29. 29. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Neurospeller
  30. 30. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Operator Monitoring
  31. 31. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Operator Monitoring
  32. 32. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Forensics-LIE Detection
  33. 33. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Entertainment
  34. 34. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Health
  35. 35. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. NeuroMarketing • Impact of Advt ,movies is measured by a sample of audiences Before the release of an Advt or Movie
  36. 36. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Neuroscience
  37. 37. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. Mindwave Mobile vs Mindwave BRAIN SENSOR EAR CLIP BATTERY TGAM MODULE
  38. 38. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. HEADSET PLACEMENT
  39. 39. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. FEATURES • Single Sensor on FP1 • Can detect multiple mental states simultaneously • Reference electrode on Ear clip to remove ambient noises • IP involves noise cancellation and signal amplification • Provides EMG feature for Eye Blink detection
  40. 40. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. SPECIFICATIONS • Bluetooth ™ Wireless communication • Passive Dry Sensor EEG • Single AAA battery • 10 Hours Run Time eSense Brainwave Patterns: • Attention • Meditation • Eye Blink • Frequency Bands: 0.5 to 50Hz
  41. 41. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. THINKGEAR •TGAM MODULE offers e-Sense technology •Outputs Attention, Meditation and Physical eye blinks from raw EEG data •2.79cm x 1.52cm x 0.25cm, weighs 130mg •Communicates through UART interface at baudrate 1200, 9600 or 57600
  42. 42. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. SUPPORTED PLATFORMS
  43. 43. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. MINDBOT SPECIFICATIONS: • Micro Controller : 8051 • ZIGBEE MODULE-Frequency : 2.3 Ghz • Attention level < 65 ------ STOP • Attention level > 65 ------ START • Baud rates available at 1200, 9600 ,57600 or 115200
  44. 44. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. MINDBOT BLUETOOTH UART UART ZIGBEE MODULE SENSES ATTENTION LEVEL BLUETOOTH RFCOMM SERIAL PORT ZIGBEE MODULE 8051 CONTROLLER WHEEL CONTROL BOT uses ‘SERIAL’ function TX COMMAND HEADSET RX COMMAND CONTROLS MOTOR BASED ON COMMAND
  45. 45. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd. For more details – www.pantechsolutions.net – http://www.slideshare.net/pantechsolutions – http://www.scribd.com/pantechsolutions – http://www.youtube.com/pantechsolutions

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