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Biofeedback and Stress Management

Create an affordable, portable EEG device to guide meditation with alpha and theta waves. Improve electrode setup, circuitry, and feedback system. Explore portability with FPGA, MCU, or DSP for real-time analysis. Utilize University resources for development.

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Biofeedback and Stress Management

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  1. Biofeedback and Stress Management BME 402 Spring 2004

  2. Team Members • Eric Miller • Christopher Valley • Erik Birkeneder • Kevin Kinney Advisor - Client • Mitchell E. Tyler • Dr. Dan Muller

  3. Overview • Problem Statement • Background • Last Semester’s Progress • Improvements • Budget • Future Work • Thank You

  4. Problem Statement Design and build an inexpensive, portable electroencephalogram that teaches meditation practitioners to achieve optimal meditation states by the presence of EEG alpha and theta waves. • Design an effective electrode setup • Design brain wave detection circuitry • Design optimal feedback mechanism

  5. Background Meditation States • Beta State • 13 – 40 Hz • Alertness, Concentration, • Cognition • Alpha State • 8 – 13 Hz • Relaxation, Visualization, • Creativity

  6. Background Meditation States • Theta State • 4 – 7 Hz • Meditation, Intuition, Memory • Delta State • 0 – 7 Hz • Detached awareness, Healing, Sleep

  7. Last Semester’s Progress Labview Program • Acquisition and Recording of Data • Allows historical analysis of a complete meditation session • Can determine percentage of time spent in desired frequency states • Allows easy testing of different feedback mechanisms without manipulating a analog circuit

  8. Labview Computer Model Block Diagram Amplifier (15000 gain) MeditationPractitioner Low pass filter (fc = 50 Hz) Electrodes Visual feedback Power Spectrum (a, q, awake) Filters (a, q, awake) Labjack Data Acquisition Audio feedback Power Spectrum vs. time - analog - digital

  9. Improvements • Electrode Focus • Previous semester’s design unreliable • Signal extremely corrupted by motion artifact • Headband limited configuration capabilities • Electrode Design • Grass-Telefactor Electrodes Ag/Ag-Cl • Disposable ECG Electrodes --2 mm Hole --10 mm Cup Diameter

  10. Improvements • Electrode Placement • Configuration 1 • 2-occipital, 1-mastoid • Configuration 2 • 2-occipital, 1-frontal • Configuration 3 • 2-mastoid, 1-frontal • Configuration 4  Gave Best Results • All 3 frontal

  11. Electrode Results • Sample EEG 1 ~36 Hz • Christopher Awake

  12. Electrode Results • Sample EEG 2 ~10 Hz • Christopher Sleeping

  13. Proposed Portability Solutions • Portability Options • FPGA • Microcontroller (MCU) • Microprocessor (DSP) • PDA

  14. Proposed Portability Solutions • Processor Requirements • Real time analysis • Affordable • Flexible Programming • Possible Solutions • DSP • MSP430 MCU - ? • PDA/PC

  15. Current Costs

  16. Future Work • Reconfiguration of Algorithm in LabView • Feedback options testing • University Resources for Development Kit • Program the DSP processor • Test device

  17. Thank You • UW Hospital EEG Clinic • Sheila Franzosa • W. Keck Laboratory • Richard Davidson • Isa Dolski

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