EEG and evoked potentials

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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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L EEG Normal
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EEG rythms
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L EEG Pathologique
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Stim
Evoked potentials
Stimulus
EEG
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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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• Propagation of action potential
• Synaptic activation or inhibition

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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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Why rythmic activities?

• Spontaneous oscillatory properties of neurons
• Reverberating networks
• Emerging properties

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Population 1
EEG EPs
S
Population i
Population N
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Population 1
EEG EPs
S
Population i
Population N
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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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1929 - 1970
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1970
1980
1990
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2 questions

• How does it look like ?
• CT Scan
• Structural MRI
• How does it work ?
• EEG EP
• PET-scan, fMRI

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EEG EPs
Time resolution 1 min
1 sec 1 msec
f MRI
PET
5 cm 1 cm
1mm Anatomical resolution
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EEG EPs
Time resolution 1 min
1 sec 1 msec
f MRI
PET
5 cm 1 cm
1mm Anatomical resolution
cost !
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EEG and evoked potentials

• General description
• From neurons to scalp
• Mechanisms of genesis
• EEG, EPs and neurosciences
• Signal analysis

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Phenomenology
Physiology