As would be expected due to the typical electrode placement, four of the five subjects had ERPs related to tongue protrusion. Subject DV had the best electrode configuration for research purposes, a grid placed over sensory motor cortex. At least one valid ERP template was identified for each activity performed by this subject with the largest number identified for tongue protrusion. Stimulation studies performed on this subject by the epilepsy surgery program showed that the grid was placed primarily over tongue sensory-motor areas. ERP identification for averaged template.
Entries are the number of valid ERPs templates over the total number of templates.
The detection accuracy obtained for three of the five subjects shows that it may be possible to detect ECoG signal patterns related to voluntary cognitive activities with sufficient accuracy to operate a direct brain interface. These results are especially impressive because the location of the electrodes could not be specified. Improved accuracy should be possible when the electrode locations can be chosen for the purpose of detecting ECoG signals related to a specific activity. A portion of the false- positive percentage may be a result of the measurement techniques. The identification of detections as either valid hits or false-positives is based on their proximity to the recorded triggers.