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Biofeedback and Stress Management

Biofeedback and Stress Management. BME 402 Spring 2004. Team Members. Eric Miller Christopher Valley Erik Birkeneder Kevin Kinney. Advisor - Client. Mitchell E. Tyler. Dr. Dan Muller. Overview. Problem Statement Background Last Semester’s Progress Improvements Budget Future Work

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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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