Human
Brain and
Behavior
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Time-dependent description of
the components
time
time
Time-dependent description of
their coordination
time
Adapted from Gray, König, Engel & Singer, 1989
“synchronized” – rhythm is regular – amplitude is large – observed during idling
“desynchronized” – rhythm is
irregular – small amplitude –
observed during engaged
cognitive states
Alert
Desynchronized
Desynchronized
No integrative percept
Idling
Synchronized
Synchronized
Integrative percept
Galuske et al
information
segregation
Too little coordination
(schizophrenia, autism
etc…)
integration
Cognition
Too much
coordination
(epilepsy)
Kelso et al., 1990
Bressler and Kelso, 2001
Kelso &Tognoli, 2007
Tognoli & Kelso, 2009
f = dw - a sinf - 2b sin (2f) + Qxt
time
(phase of one oscillator)
time
If rpt=rpt+1=rpt+2…
Oscillations are
phase-locked
time
If rpt=rpt+1=rpt+2…
Oscillations are
phase-locked
Kelso et al., 1990
Bressler and Kelso, 2001
Kelso &Tognoli, 2007
Tognoli & Kelso, 2009
f = dw - a sinf - 2b sin (2f) + Qxt
Why?
Brain is a complex nonlinear
system
Advantages?
Key features:
patterned connectivity (locally
dense, remotely sparse and
selective)
2. Speed: no need for a
disengagement mechanism
(phase scattering)
Symmetry breaking:
-Heterogeneity of the coordinating
elements: different intrinsic
frequencies
-Heterogeneity of their coupling
1. Coordination extended to a
larger range of components
3. Flexibility: a series of
attracting tendencies can be
visited dynamically over the
time course of the
Coordination Variable
4. Balance
integration~segregation:
situates the system in the
range of maximal information
With Bernier, Murias et al.
imitation behavior in autistic
adults
Tognoli & Kelso, in prep
4d dynamical analysis of continuous EEG is key to recognize real synchrony
Benites et al., in prep
Information transfer
(Shannonian theory)
Linearly
coupled oscillations
(Hebbian assemblies theory)
Human
Brain and
Behavior
Laboratory