Transcript Electroencephalogram Control System

Dr. Boris Hyle Park
BIEN 175A Group F
Joseph Steven Fletcher
Ryan Alan LaCroix
Gary Matthew Stroup
Kenneth Gerard Sugerman
March 15, 2010
Purpose

Produce a two dimensional EEG controller for
widespread application
Mechanical arm
 Hands free light for Dentist
 Wheel Chair

Adapted from www.toysrus.com
Adapted from www.fotosearch.com/bthumb
http://blogs.static.mentalfloss.com
Specifications
Output vs. Tim e
3
Training Time


<15 minutes
Output

Continuous Signal
2
Output (mV)

1
0
0
10
20
30
40
50
-1
Tim e (sec)


25 ft control range
2 independent axes
•Off
•Off
•Med
•Med
•High
•High
Timeline

Reverse Engineer Force Trainer and Mindflex

Forcetrainer
 Disassemble
 Characterize Components

Mindflex
 Disassemble
 Characterize Components

Projected Completion date
 March 14, 2010
 End of the Quarter
Timeline

Determine Electrode Placement



Research possible locations
Test and analyze locations
Projected Completion Date
 May 16, 2010

Demonstration Device

Tank like RC Car
 Mimic wheelchair control

Projected Completion Date
 June 4, 2010
Adapted from www.toysrus.com
Gantt Chart
Consumer Products
Force Trainer
Mindflex
Adapted from http://company.neurosky.com/products/
NeuroSky Circuitry from Force Trainer
http://www.ipmc.cnrs.fr
Adapted from http://s4.hubimg.com/
Previous Results

Fan Modulation



Duty Cycle
Oscillating Signal
~470 Hz

DC Drift

Peak Height
Fan Off
Fan Medium
Fan High
Previous Results

Fan Modulation



Duty Cycle
Oscillating Signal
~470 Hz

DC Drift

Peak Height
Fan Off
Fan Medium
Fan High
Previous Results

Design Specification



Continuous
Three levels
Integrator Circuit


Electronically performs
integration
RC Time constant
Previous Results
Design Specification



OutputVoltage
Voltage vs.
Output
vs.Time
Time
Slow
Speed
Fast Speed
1000ms Response time
3 Levels of Control
3.5
3
Integrator Output vs Tim e
Voltage (V)
2.5
4
3.5
Voltage (V)
3
2
1.5
1
2.5
0.5
2
1.5
0
38.8
33.8
1
0.5
39.2
34.2
39.4
34.4
39.6
34.6
Tim e (sec)
0
-0.5 0
39
34
2
4
6
Tim e (sec)
8
10
39.8
34.8
40
35
40.2
35.2
Solutions

Continuous control


Integrator
DC Drift

High Pass Filter
Fan Off

Peak Height


Threshold Circuit
(Clamp)
AC to DC

Fan Medium
Rectifier
Fan High
Current Progress

Circuitry Design
High
Pass
http://www.ipmc.cnrs.fr
Adapted from http://s4.hubimg.com/
Current Progress
• Damaged circuits in the Force Trainer
• 2nd Force Trainer Components Analyzed without disassembly




Used FGEN to input a sine wave
45 Hz-300 Hz (5 Hz increments)
10 mV amplitude
Summation Circuit




Used FGEN to input a sine wave
45 Hz-300 Hz (5 Hz increments)
10 mV amplitude
Summation Circuit
http://www.ipmc.cnrs.fr
Adapted from http://s4.hubimg.com/
http://www.ipmc.cnrs.fr
Work Completed

Characterization of Mindflex and Force Trainer

Built and characterized an Integrator Circuit

Begun Work on Additional Circuit Components

Researched possible electrode placement

Analyzed Useable Signal Frequencies with a
Function Generator
Future Work

Continue design of a circuit to differentiate between
medium and high signal



Continue Troubleshooting of Circuit Components


Rectifier
Further Examine readings made by Mind Flex and
Force Trainer


High Pass Filter
Threshold Circuit
Summation Circuit
Continue Testing of Electrode Placements
References
Flatley, Joseph L. “G-Tec Intendix brain-computer interface ready for consumers.”
http://www.engadget.com/2010/03/10/g-tec-intendix-brain-computer-interfaceready-for-consumers-vid/
Galan, F. et al. “Continuous Brain-Actuated Control of an Intelligent Wheelchair by
Human EEG”. ftp://ftp.idiap.ch/pub/papers/2008/galan-grazBCI2008-2008.pdf.
Murph, Darren. “Thought-control research brings mental channel changing ever closer.”
http://www.engadget.com/2010/02/24/thought-control-research-brings-mentalchannel-changing-ever-clo/?icid=engadget-iphone-url
Dr. Hyle Park Assistant Professor, Bioengineering
A211 Bourns Hall, Riverside, CA 92521
Patel, Nilay. “Mattel Mindflex hack shocks you into serenity.”
http://www.engadget.com/2010/03/04/mattel-mindflex-hack-shocks-you-intoserenity/
Dr. Aaron Seitz, Assistant Professor, Psychology
3101 Psych, Riverside, CA 92521
Phone: 951-827- 6422
Provost, Sheldon, J. Lucas McKay. “A real-time EEG Based Remote Control of a Radio
-Shack Car”. http://www.lems.brown.edu/~scp/eegremotecontrolcar.pdf.
Hong Xu, Development Engineer in Bioengineering at UCR
A217 Bourns Hall, Riverside, CA 92521
Phone: 951-827-7235
The Local. “Scientists develop helmet to control toy cars via brain waves”. Science &
Technology. 19 Jun 2008. http://www.thelocal.de/sci-tech/20080619-12577.html.
Questions?
http://www.istockphoto.com