brain wave group 1
DESCRIPTION
Brain Wave Group 1. Final Presentation James Lin Son Phan Michael Oduselu. Purpose. Research Thought Controlled Applications Observe how mind control can be used Open new means of communication Enhance quality of life and mental well-being. Potential Applications. EEG Biofeedback - PowerPoint PPT PresentationTRANSCRIPT
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Brain Wave Group 1
Final PresentationJames LinSon Phan
Michael Oduselu
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Purpose Research Thought Controlled
Applications Observe how mind control can be
used Open new means of communication Enhance quality of life and mental
well-being
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Potential Applications EEG Biofeedback
Control brain rhythms Computer Control & Communication
Thought controlled systems Entertainment & Virtual Reality
Brain influcenced music and graphics Adaptive Virtual Worlds
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Applications Cont. Education and Research
Brainwave experiments and labs Military and Commercial Applications
Monitor health and concisousness (NASA)
Controlling planes (Air Force) Monitor consumer reactions to Ads and
Products
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Research Background John Chapin
Trained 6 rats to push a lever Computer established pattern for
pushing lever Mice pushed lever with thought
Gloria Calhoun Used brainwaves to pilot a flight
simulator
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EEG Stands for Electroencephalogram Records bioelectric activity of brain Monitors Frequencies from 0.5 to
20 Hz Dependent on brain activity
Age, arousal level, sleeping state, cerebral dysfunctions
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EEG Machines Available Brainmaster
2-channel general purpose brainwave monitor
Performs data storage, retrieval, real-time signal processing, display, and feedback
WaveRider Jr Has Audiovisual feedback More integrated and configured for easy
use but less sophisticated
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EEG Machines Cont. POD
EEG feedback machine Used to improve self in areas ranging
from studying to golf ProComp
8 channel machine capable of EEG, EMG, EKG, skin conductance, temperature, heart rate, etc.
Expensive
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Goals Tackle first task of reading
brainwaves Research and design EEG circuit Assemble EEG circuit Read brainwave on oscilloscope
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Design Objective Build EEG Circuit
Get parts Use BrainMaster schematicsd
Test/Optimize EEG Test for heartbeat Test for brainwave Solder final circuit
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Previous Design
Amplifier didn’t work
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Revised Design
First step: EEG Monitor
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Amplifier Schematic
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Analysis Objectives Understanding Circuit
• Brain-Master Schematic• Part Functions
Implement Circuit in P-spice• Ideal Op-Amps• AD620• OP90
Simulate and Examine Result• Input and Output• Total Gain
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Implement Circuit in P-spice
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Simulate and Examine Result
0
1
2
3
4
5
1 10 100 1000
The Output Voltage
Voltage
Vol
tage
Frequency
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Continued…
0
5000
1 104
1.5 104
2 104
2.5 104
1 10 100 1000
Total Amplifier Gain
Gain
Gai
n
Frequency
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Specifications Type: differential Gain: 20,000 Bandwidth: 1.7 –
34 Hz Input Range
200uV Output Range 4 V CMRR >100dB
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Other components Midpoint Voltage circuit
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Other components Clean power source
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Navigation: Waves vs Emotion
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Heartbeat Test Results Breadboard
circuit measurement of heart beat Second figure
shows a close up. Compare with
EKG
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Assemble working circuit Solder circuit
together for better performance
Cleaner signal with better electrodes and pads
Flat signal = good sign
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Signal from head Tested signal to
amp by biting down.
First capture shows one bite.
Second capture shows 3 bites.
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Measure Brainwaves Results from head
show fluctuating signal between 3 and 30 Hz.
Wave compared to Brainmaster screenshot.
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Brain results cont. Waves look similar Need to use filtering
to isolate frequency energy of wave in a specific time.
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FFT Response FFT shows that range
of frequncies is 0 – 30 Hz
Closer insepection shows a consistant frequency spike around 10 Hz.
Frequency corresponds to Alpha waves at front of head.
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Muscle induced response First capture
shows response of raising eyebrows once.
Second capture shows two eyebrow raises.
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Results continued Capture shows
signal created by a hard blink
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Conclusions EEG amplifier worked well in
collecting signals from the head. Muscles signals were far easier to
see and create. No training involved. Application such as a vehicle
requires instantaneous responses which muscle signals may be better suited for.