Cross-Correlation Based Detection

A plot showing three graphs.  The first depicts an ERP template which appears as a small triangular waveform.  The second shows the unprocessed ECoG which appears as a squiggly line.  The third shows the cross correlogram of the template and the ECoG and distinct peaks are visible at the time of each marked action.  Two peaks, representing false postivies appear between the marked actions. Graph:  A spiky line shows the cross-correlation values for one data set.  A threshold crosses the spikes to indicate where a 'detection' occurred.  All detections except for one correspond to a movement by the person. That detection is labeled 'false positive.'

Single Channel Detection

 

 

 

 

Cortical Mapping Locations

A drawing of the brain with the listed areas drawn in. ECoG electrode locations are classified in one of 11 areas.

Multiple-Channel Detection

Combination of 2 or more channels to incorporate potential redundancy from different electrode sites

Method Description
Averaging Average single-channel cross-correlograms.
Then determine detection points.
AND Determine single-channel detection points.
If on all of the combined channels = Detection.
OR Determine single-channel detection points.
If on any of the combined channels = Detection.
Majority Vote Determine single-channel detection points.
If on majority of combined channels = Detection.

Feedback Experiments


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