Typical absence seizures in adults: clinical, EEG, video-EEG ...
Clinical EEG Rhythms
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Clinical EEG RhythmsClinical EEG Rhythms
Eyes Closed BaselineEyes Closed Baseline
Eyes Open BaselineEyes Open Baseline
Spectral Plot is one way to present frequency and Spectral Plot is one way to present frequency and amplitude information – start hereamplitude information – start here
Brain MapsBrain Maps
TopometricsTopometrics
Frontal Slowing during Math: Frontal Slowing during Math: AbnormalAbnormal
Numbers for Statistical AnalysisNumbers for Statistical Analysis
Quantitative EEG (QEEG) Quantitative EEG (QEEG)
Some of the signal properties that Some of the signal properties that can be quantifiedcan be quantified
Also between-site differences…Also between-site differences…
Absolute Absolute MagnitudeMagnitude
Relative Relative MagnitudeMagnitude
AsymmetryAsymmetry
CoherenceCoherence
Attenuation of temporal lobesAttenuation of temporal lobes Beta1=SMRBeta1=SMR Waveform morphologyWaveform morphology BipolarBipolar Non-specific arousalNon-specific arousal
Role of Topography and “Timing”Role of Topography and “Timing”
Waveform morphologyWaveform morphology
Power vs MagnitudePower vs Magnitude Squared microvolts vs microvoltsSquared microvolts vs microvolts
Cross-spectral analysisCross-spectral analysis
Coherence estimates phase consistency Comodulation estimates magnitude consistency …between signals at each specified frequency
Coh = average normalized cross-spectrum amplitude2
Comod = average normalized cross-product amplitude
Coh range from 0.0 to 1.0 Comod range from -1.0 to 1.0
Confusing point: Tukey called “coherency” the square root of coherence
Signals are Signals are coherentcoherent when when phase relationship phase relationship is stableis stable Signals are Signals are
comodulated comodulated (or (or hypermodulated) hypermodulated) when magnitude when magnitude relationship is relationship is stablestable
ComodulationComodulation
Each site compared to all others (& itself) Each site compared to all others (& itself) in each headin each head
An individual’s data (rho) and An individual’s data (rho) and his/her statistical (z) comparison his/her statistical (z) comparison
to the databaseto the database
MTBI patient Rage DisorderMTBI patient Rage Disorder
HypermodulationHypermodulation
HypomodulationHypomodulation
Current EEG ApplicationsCurrent EEG Applications
CLINICALCLINICAL Epilepsy (1930s)Epilepsy (1930s) Sleep (1940s)Sleep (1940s) Patient monitoring, anaesthesiaPatient monitoring, anaesthesia Head injury assessmentHead injury assessment Neurological assessment (AEP, Neurological assessment (AEP, ERPERP)) NeurotherapyNeurotherapy Psychiatric assessmentPsychiatric assessment
Current EEG ApplicationsCurrent EEG Applications
SCIENTIFICSCIENTIFIC AttentionAttention WorkloadWorkload Circadian rhythmsCircadian rhythms CognitionCognition Learning & MemoryLearning & Memory Neuroimaging co-registrationNeuroimaging co-registration
Future EEG AssessmentFuture EEG Assessment
Subtype clinical conditionsSubtype clinical conditions Monitor attentional stateMonitor attentional state Lie DetectionLie Detection Parole dispositionParole disposition