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Space x,y Wave amplitude v Time t

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The land of time (dynamics at 1 space point) x,y,v (for t =t n ) t,v (for x = x l and y = y m ) The land of space (map at 1 time point)

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Time snapshots Multiplot x,y,v t1 x,y,v t2 … t,v (x1,y1) t,v (x1,y2) … t,v (x2,y1) t,v (x2,y2) … … … … Movie

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Where to redirect space? v t wave amplitude time xyxy abscissa ordinates xyxy space

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Perceptual organization Color vision Location/proximity → color attributes/color similarity Temporal ubiquity Vision Persistence of information Selective attention Memory

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Colorimetric model: distance in a color space Gestalt Ability of the brain to perform perceptual organization

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v t xyxy space wave amplitude time xyxy abscissa “wave length” (colorimetric model) ordinates

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(x,y) x,y,v,t

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Welcome to hell: ~1 week of analysis per second of EEG Less than 2 cycles per spatio-temporal pattern - typical -

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4D visualization Filter selection Phase aggregation analysis Segmentation Coordination Dynamics Source location/source dynamics Database spatio-temporal features Stationary? YES NO Temporal organization Classification REFINE

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Conditions of occurrence: Mental states, clinical/pharmacological condition, cognitive operations, behavior…

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Rabinovitch et al., (2008)

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Two uncoordinated assemblies Real synchronization inphase

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Babiloni et al., 2005 Source estimation is aided by 3 key aspects of this frameworks: Reconstruction performed on homogeneous samples of brain dynamics Limited inter-electrode variance in SNR and artifacts (bandpass filter) Prior knowledge (number of source, coordination dynamics...) provides constraints

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