eeg coordination dynamics: self-organization in the brain
DESCRIPTION
The Human Brain and Behavior Laboratory. EEG COORDINATION DYNAMICS: self-organization in the brain. http://www.ccs.fau.edu/hbbl.html. Emmanuelle Tognoli 12/17/2007 Merck – West-Point. The Human Brain and Behavior Laboratory. - PowerPoint PPT PresentationTRANSCRIPT
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EEG COORDINATION DYNAMICS: EEG COORDINATION DYNAMICS: self-organization in the brainself-organization in the brain
The Human
Brain and Behavior
Laboratory
Emmanuelle Emmanuelle Tognoli Tognoli
12/17/200712/17/2007Merck – West-PointMerck – West-Point
http://www.ccs.fau.edu/hbbl.html
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IntroductionIntroductionThe paradigm of EEG The paradigm of EEG
in “cognitive neuroscience”in “cognitive neuroscience”
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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local areas
inter-areal connectivity,
circuits
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Neuromarkers of social behaviorNeuromarkers of social behaviorA dual EEG studyA dual EEG study
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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SUBJECTS: SUBJECTS: Sixteen subjects (10 males, 6 females, aged Sixteen subjects (10 males, 6 females, aged between 22 and 41 years, (mean 29 years). between 22 and 41 years, (mean 29 years). Constituted 8 pairs: 4 gender-mixed; 3 male-male; 1 Constituted 8 pairs: 4 gender-mixed; 3 male-male; 1 female-female. female-female. All right-handed on the basis of self-report. All right-handed on the basis of self-report. Had normal or corrected-to-normal vision and Had normal or corrected-to-normal vision and reported no history of neurological disease. reported no history of neurological disease.
t=20-40st=20-40s t=40-60st=40-60st=0-20st=0-20s
TRIALS: TRIALS: 36 trials lasting 1 minute.36 trials lasting 1 minute.
Vision of the other controlled Vision of the other controlled through fast-switching (1.2ms) LCD through fast-switching (1.2ms) LCD screen, turning transparent at screen, turning transparent at t=20s and back to opaque at t=40s t=20s and back to opaque at t=40s
DUAL-EEG RECORDING:DUAL-EEG RECORDING: Dual-EEG recorded using two 60- Dual-EEG recorded using two 60-channel EEG caps with Ag-AgCl electrodes (Falk Minow channel EEG caps with Ag-AgCl electrodes (Falk Minow Services, Germany) arranged according to the 10 percent Services, Germany) arranged according to the 10 percent system (midline and rows 1 to 8), with 2 distinct referential system (midline and rows 1 to 8), with 2 distinct referential montages. montages.
Signals directed to a single amplifier (Synamp2, Neuroscan, Signals directed to a single amplifier (Synamp2, Neuroscan, Texas) analog filtered (Butterworth, bandpass from 0.05 Hz Texas) analog filtered (Butterworth, bandpass from 0.05 Hz ( -12 dB/octave) to 200 Hz (-24 dB/octave), amplified (gain= ( -12 dB/octave) to 200 Hz (-24 dB/octave), amplified (gain= 2010) and digitized at 1000 Hz with a 24 bits ADC in the 2010) and digitized at 1000 Hz with a 24 bits ADC in the range ±950 microV (vertical resolution of 0.11nV).range ±950 microV (vertical resolution of 0.11nV).
Recording performed with the respective grounds located at Recording performed with the respective grounds located at FPz sites and the references at the corresponding linked FPz sites and the references at the corresponding linked mastoids. Impedances maintained below 10 kOhms. mastoids. Impedances maintained below 10 kOhms.
TASK:TASK: perform regular continuous finger perform regular continuous finger movements at a comfortable pace during movements at a comfortable pace during one minute trials. Subjects are instructed to one minute trials. Subjects are instructed to adopt the most comfortable pace, at any adopt the most comfortable pace, at any time during the trialtime during the trial
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Spatio-spectral patterns
16.384 sec
Fs: 1000 Hz
Samples: 16384
Spectral Resolution: 0.06Hz
Space (scalp surface): 2D
Frequency: 1D
Amplitude: 1D
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+
=
ERS
ERD
ERD
trouble
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Assessment:Assessment:
method is sensitive (small change -obscured by other method is sensitive (small change -obscured by other processes- can be detected)processes- can be detected)
cracks-down sources of inter-individual variabilitycracks-down sources of inter-individual variability
has a good construct validity (the measure of mu is a has a good construct validity (the measure of mu is a measure of mu, not a measure of mixed processes)measure of mu, not a measure of mixed processes)
differentiates difficultly distinguishable neural differentiates difficultly distinguishable neural activitiesactivities
essentially yields information about local areas (see essentially yields information about local areas (see after)after)
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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Assessment:Assessment:
method is sensitive (small change -obscured by other method is sensitive (small change -obscured by other processes- can be detected)processes- can be detected)
cracks-down sources of inter-individual variabilitycracks-down sources of inter-individual variability
has a good construct validity (the measure of mu is a has a good construct validity (the measure of mu is a measure of mu, not a measure of mixed processes)measure of mu, not a measure of mixed processes)
differentiates difficultly distinguishable neural differentiates difficultly distinguishable neural activitiesactivities
essentially yields information about local areas (see essentially yields information about local areas (see after)after)
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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variant
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Assessment:Assessment:
method is sensitive (small change -obscured by other method is sensitive (small change -obscured by other processes- can be detected)processes- can be detected)
cracks-down sources of inter-individual variabilitycracks-down sources of inter-individual variability
has a good construct validity (the measure of mu is a has a good construct validity (the measure of mu is a measure of mu, not a measure of mixed processes)measure of mu, not a measure of mixed processes)
differentiates difficultly distinguishable neural differentiates difficultly distinguishable neural activitiesactivities
essentially yields information about local areas (see essentially yields information about local areas (see after)after)
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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Theory of Coordination Dynamics:Theory of Coordination Dynamics:Self-organization of oscillatory Self-organization of oscillatory
ensemblesensembles
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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0
/2
/2
0
/2
/2
0
/2
/2/3
50 msec
67 msecA B C
0 msec
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= - a sin - 2b sin (2) + Qt
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“…my evidence in the past 18 years for sustained synchrony (never antiphasic), for spatial phase gradients in intracranial EEGs
from high-density arrays, and for phase cones with phase velocities corresponding to intracortical axonal propagation
velocities as evidence for state transitions.”
Walter Freeman
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0
/2
/2
A0 msec
Electrical:Spatial summation
Chemical:LTP/LTD
Zero-Lag SynchronizationZero-Lag Synchronization
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Transiently Synchronized Neural Cell Transiently Synchronized Neural Cell Assemblies:Assemblies:
Phase Locking in the brain?Phase Locking in the brain?
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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Inphase in scalp EEG?
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28
Antiphase in scalp EEG?
Indeed by the plenty (too many):
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Rodriguez et al., 1999 Nature
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broken symmetry
= - a sin - 2b sin (2) + Qt
BriefRare
Smaller amplitude
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Forward models
Where is the true antiphase?The same volume conduction effect that
emphasizes spurious antiphase synchrony also attenuates real
antiphase synchrony.
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Forward models of source pairs:Forward models of source pairs:states and transitionsstates and transitions
The Human
Brain and Behavior
Laboratory
http://www.ccs.fau.edu/hbbl.html
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E1: AE1: amplitude at location 1fE1:frequency at location 1E1: phase at location 1
E2: AE2: amplitude at
location 1fE2: frequency at location
1E2: phase at location 1
S1: AS1: amplitude at location 1fS1:frequency at location 1S1: phase at location 1
S2: AS2: amplitude at
location 1fS2: frequency at location
1S2: phase at location 1
E1=0.95*S1+p*S2
E2=0.95*S2+p*S1
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Transitions, intermittency, uncoupled areas
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AMPLITUDE MODULATION
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AssessmentAssessment::
While the While the average picture average picture (part I):(part I):-discarded critical information (inter-areal coupling)-discarded critical information (inter-areal coupling)
-created intra- and inter-individual variability -created intra- and inter-individual variability -occasionally created fictive properties-occasionally created fictive properties
-prevented introduction many variables/steps in -prevented introduction many variables/steps in protocols (parameter spaces)protocols (parameter spaces)
The The continuous methodcontinuous method::-yields first deterministic findings of inter-areal -yields first deterministic findings of inter-areal
synchronizationsynchronization-has temporal resolution at the limit of recording -has temporal resolution at the limit of recording
instruments (pharmaco-dynamics)instruments (pharmaco-dynamics)-has maximal consistency-has maximal consistency
-and above all…-and above all…
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In general, EEG amplitude
IS NOT speaking about cortical source
strength