Biofeedback and Stress Biofeedback and Stress ManagementManagement

BME 402BME 402

Spring 2004Spring 2004

University of Wisconsin - MadisonBiomedical Engineering Design Courses

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3) Agrees to keep this information in confidence until the University and therelevant parties listed in Part (2) above have evaluated and secured anyapplicable intellectual property rights in this information.

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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

Thank YouThank You

UW Hospital EEG UW Hospital EEG ClinicClinic Sheila FranzosaSheila Franzosa

W. Keck LaboratoryW. Keck Laboratory Richard DavidsonRichard Davidson Isa DolskiIsa Dolski