Download - Biofeedback and Stress Management
Biofeedback and Stress Biofeedback and Stress ManagementManagement
BME 402BME 402
Spring 2004Spring 2004
University of Wisconsin - MadisonBiomedical Engineering Design Courses
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Team MembersTeam Members
Eric MillerEric Miller Christopher ValleyChristopher Valley Erik BirkenederErik Birkeneder Kevin KinneyKevin Kinney
Advisor - ClientAdvisor - Client Mitchell E. TylerMitchell E. Tyler Dr. Dan MullerDr. Dan Muller
OverviewOverview
Problem StatementProblem Statement BackgroundBackground Last Semester’s ProgressLast Semester’s Progress ImprovementsImprovements BudgetBudget Future WorkFuture Work Thank You Thank You
Problem StatementProblem Statement
Design and build an inexpensive, portable Design and build an inexpensive, portable electroencephalogram that teaches electroencephalogram that teaches meditation practitioners to achieve optimal meditation practitioners to achieve optimal meditation states by the presence of EEG meditation states by the presence of EEG alpha and theta waves.alpha and theta waves.
Design an effective electrode setupDesign an effective electrode setup Design brain wave detection circuitryDesign brain wave detection circuitry Design optimal feedback mechanismDesign optimal feedback mechanism
BackgroundBackground
Beta StateBeta State 13 – 40 Hz13 – 40 Hz Alertness, Concentration, Alertness, Concentration, CognitionCognition
Alpha StateAlpha State 8 – 13 Hz8 – 13 Hz Relaxation, Visualization, Relaxation, Visualization, CreativityCreativity
Meditation StatesMeditation States
BackgroundBackground
Theta StateTheta State 4 – 7 Hz4 – 7 Hz Meditation, Intuition, Meditation, Intuition,
MemoryMemory
Delta StateDelta State 0 – 7 Hz0 – 7 Hz Detached awareness, Detached awareness,
Healing, SleepHealing, Sleep
Meditation StatesMeditation States
Last Semester’s ProgressLast Semester’s ProgressLabview ProgramLabview Program
Acquisition and Recording of DataAcquisition and Recording of Data Allows historical analysis of a complete Allows historical analysis of a complete
meditation sessionmeditation session Can determine percentage of time spent in Can determine percentage of time spent in
desired frequency statesdesired frequency states Allows easy testing of different feedback Allows easy testing of different feedback
mechanisms without manipulating a mechanisms without manipulating a analog circuitanalog circuit
Labview Computer Model Block Labview Computer Model Block DiagramDiagram
Electrodes Low pass filter (fc = 50 Hz)
Amplifier(15000 gain)
Meditation Practitioner
Labjack Data Acquisition
Visual feedback
Power Spectrum vs. time
Power Spectrum( awake)
Filters(, awake)
Audio feedback - analog- analog
- digital- digital
ImprovementsImprovements Electrode FocusElectrode Focus
Previous semester’s design unreliablePrevious semester’s design unreliable Signal extremely corrupted by motion artifactSignal extremely corrupted by motion artifact Headband limited configuration capabilitiesHeadband limited configuration capabilities
Electrode DesignElectrode Design Grass-Telefactor Electrodes Ag/Ag-ClGrass-Telefactor Electrodes Ag/Ag-Cl Disposable ECG ElectrodesDisposable ECG Electrodes
--2 mm Hole
--10 mm Cup Diameter
Electrode PlacementElectrode Placement Configuration 1Configuration 1
2-occipital, 1-mastoid2-occipital, 1-mastoid
Configuration 2Configuration 2 2-occipital, 1-frontal2-occipital, 1-frontal
Configuration 3Configuration 3 2-mastoid, 1-frontal2-mastoid, 1-frontal
Configuration 4 Configuration 4 Gave Best Results Gave Best Results All 3 frontalAll 3 frontal
ImprovementsImprovements
Electrode ResultsElectrode Results
Sample EEG 1 ~36 HzSample EEG 1 ~36 Hz Christopher AwakeChristopher Awake
Electrode ResultsElectrode Results
Sample EEG 2 ~10 Hz Sample EEG 2 ~10 Hz Christopher SleepingChristopher Sleeping
Proposed Portability SolutionsProposed Portability Solutions
Portability OptionsPortability Options FPGAFPGA Microcontroller (MCU)Microcontroller (MCU) Microprocessor (DSP)Microprocessor (DSP) PDAPDA
Processor RequirementsProcessor Requirements Real time analysis Real time analysis AffordableAffordable Flexible ProgrammingFlexible Programming
Possible SolutionsPossible Solutions DSPDSP MSP430 MCU - ?MSP430 MCU - ? PDA/PCPDA/PC
Proposed Portability SolutionsProposed Portability Solutions
Current CostsCurrent Costs
Components $Cost$
Grass Telefactor Electrodes $121.00$121.00
Preparation Materials $20.00 to $40.00$20.00 to $40.00
Processor Development Kit: $3,500Development Kit: $3,500
Cost/Unit: $1.40Cost/Unit: $1.40
Total Initial Development: $3680Initial Development: $3680
Total/Unit: ~$57.40Total/Unit: ~$57.40
Future WorkFuture Work
Reconfiguration of Algorithm in LabViewReconfiguration of Algorithm in LabView Feedback options testingFeedback options testing University Resources for Development KitUniversity Resources for Development Kit Program the DSP processorProgram the DSP processor Test deviceTest device