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Spatio-Temporal Digital Signal Processing for Focus Localization from array EEG

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Spatio-Temporal Digital Signal Processing for Focus Localization from array EEG

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Results: The STL Transformation is capable of isolating events in the time-varying surface potential field taht are simultaneously sharp in space and in time, which characterizes focal interictal events in the EEG.

If an event is only sharp in time (such as muscle artifact) or only sharp in space the STL transformation will not emphasize it.

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This figure compares a traditional 16 channel  EEG record (top half) with the instantaneous maximum found over the array of electrodes ("imoa")for all three of the transformations: SL, TL and STL.  It can be observed that only a true interictal event in the second half of the interval is represented by the STL. Two events that were sharp in time only (arrows) are represented by the TL, but not by the SL , and   therefore do not appear in the STL imoa.
 
 
 
 
 
 
 
 
 
 
 
 

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Method: Spatio-Temporal Laplacian (STL) Transformation

Results