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peaks, spectral floor and EEG tempora E. Tognoli, october 9 th , 2008, HBBL meeting

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Page 1: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Spectral peaks, spectral floor and EEG temporal scalesE. Tognoli, october 9th, 2008, HBBL meeting

Page 2: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Peaks~floor

floor

peak

Page 3: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Interim question 1: why are there more peaks in structured behavioral tasks?

Page 4: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Steady-State paradigms and structured behavioral tasks

e.g. bimanual coordinationsocial coordinationmultimodal binding… etc

e.g. imitation task

0-3 peaks1 or 2 typical

0-5 peaks3 or 4 typical

Page 5: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Diversity of 10Hz rhythms (not a comprehensive list)

Page 6: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Non Stationarity: temporal (de)composition of brain dynamics

Largest window for spectral analysis: the run (here 28.5 sec)

Largest window for spectral analysis: the trial (here 6 sec)

STEA

DY-S

TATE

, e.g

. m

ultim

odal

bin

ding

STRU

CTU

RED

TAS

K e.

g.

imita

tion

task

a plateau

an “event”

a quasi-stationary brain state

A predetermined temporal window (here centered at the grip)

a “homogenous” behavioral state

a quasi-stationary brain state

Page 7: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

(Reminder: time-frequency tradeoff)

Fourier Wavelet

low

hightimetimetime

frequency

Page 8: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Steady-State paradigms and structured behavioral tasks

Longer paradigm Shorter paradigm

Page 9: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Topographical relations between phenomena of the short~long temporal scale:

bottom up approach

Page 10: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Topographical relation between instantaneous oscillations and spectral peaks: bottom-up

Temporal topography

Spectral topography

Spectral topography (cumulative in time)

Spectral distribution

Spectral distribution(cumulative)

Page 11: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Bottom-up (cnt’d): a drowsy subject

Page 12: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Bottom-up (cnt’d): a wakeful subject

Page 13: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Bottom-up (cnt’d): a wakeful subject with activities standing out

Page 14: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Bottom-up (cnt’d): another non-linearity

One peak, not task relatedNo peak, everything floor(or too many peaks)

Task related peaks

activation

Rest and task-related

Page 15: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Interim question 2: why don’t spectral peaks ever reveal distributed topographies?

Page 16: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Inphase locking

Spurious antiphase Antiphase-locking

“Out-of-phase” locking

Where are the distributed topographies?

Page 17: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Where are the distributed topographies?Re

pres

enta

tive

map

s of

sp

ectr

al p

eaks

: loc

aliz

ed

Expe

cted

map

s fo

rCe

rtai

n pa

tter

ns:

dist

ribut

ed

?

Page 18: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

No distributed topographies: implications

≠ + + …

Long time scale (Fourier)

short time scale (pattern)

SOME REORGANIZATION

Page 19: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Topographical relations between phenomena of the short~long temporal scale:

top down approach

Page 20: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Temporal window scaling with task

Window scaling with cognitive/behavioral process

Brain microstate

CUMULANT ABOVE THE COMMON AREA

Page 21: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

top down approach: handshake

Page 22: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Observation time scale and spectral content

Page 23: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Observation time scales and spectral content

infinite

Task-scale

process

REST

Task related (local area)

Brain state (local and network), transients

Page 24: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Should we be afraid of transients? (a.k.a. are brief events more likely to be noise than sustained ones?)

Sustained rhythms like alpha in drowsy subjects are often with poor task specificity.

They are not necessary to perform the taskThey may have good inter and intra-individual consistencyThey don’t tell us a lot about the task… yet they are quite systematically modulated by the task

Transients (dead zone of electro-physiologists) may be key to the behavioral or cognitive state under investigation. Especially, coordinated brain state are typically brief.

Page 25: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Strategies for evoked and induced paradigmsDYNAMICS

brain

behavior

brain

Page 26: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

Floor: many peaks merged together in an indistinct soup

floor

peak

Page 27: e.g. bimanual coordination social coordination multimodal binding… etc e.g. imitation task 0-3 peaks 1 or 2 typical 0-5 peaks 3 or 4 typical

EEG oscillatory processesfigures of a temporal scale ~ ground of another

Take-home message


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