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

Largest window for spectral analysis: the run (here 28.5 sec) Largest window for spectral analysis: the trial (here 6 sec) STEADY-STATE, e.g. multimodal binding STRUCTURED TASK e.g. imitation 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

Fourier Wavelet low high time frequency

Longer paradigm Shorter paradigm

Temporal topography Spectral topography Spectral topography (cumulative in time) Spectral distribution (cumulative)

One peak, not task related No peak, everything floor (or too many peaks) Task related peaks activation Rest and task-related

Inphase locking Spurious antiphaseAntiphase-locking Out-of-phase locking

Representative maps of spectral peaks: localized Expected maps for Certain patterns: distributed ?

++ … Long time scale (Fourier) short time scale (pattern) SOME REORGANIZATION

Temporal window scaling with task Window scaling with cognitive/behavioral process Brain microstate CUMULANT ABOVE THE COMMON AREA

infinite Task-scale process REST Task related (local area) Brain state (local and network), transients

Sustained rhythms like alpha in drowsy subjects are often with poor task specificity. They are not necessary to perform the task They may have good inter and intra-individual consistency They dont 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.

brain behavior brain