Results

ECoG Database

Best Detection by Subject

Subject Best HF-difference Hit % False Positive % Electrode Location Action
TS 96 96 0 Middle/Inferior Temporal Gyri Tongue Protrusion
CB 96 100 4 Parietal Lobe Middle Finger Extension
DV 93 100 7 Postcentral Gyrus Tongue Protrusion
JM 92 100 3 Middle/Inferior Temporal Gyri Saying "Pah"
KR 92 92 0 Postcentral Gryus Palmar Pinch
KH 88 100 12 Precentral Gyrus Tongue Protrusion
RW 86 86 0 Middle/Inferior Temporal Gyri Tongue Protrusion
DW 83 100 17 Precentral Gyrus Palmar Pinch
JR 79 96 17 Middle/Inferior Temporal Gyri Tongue Protrusion
KW 77 96 19 Postcentral Gyrus Tongue Protrusion
JP 74 89 15 Superior Temporal Gyrus Naming
DP 67 72 5 Middle/Inferior Temporal Gyri Tongue Protrusion
EW 55 79 24   Tongue Protrusion
GB 54 96 42 Postcentral Gyrus Palmar Pinch
ST 51 100 49   Tongue Protrusion
DT 50 93 43 Middle/Inferior Temporal Gyri Facial Movement
DB 48 87 40 Basal Temporal Lobe Saying "Tah"
VC 41 80 39 Middle/Inferior Temporal Gyri Saying "Pah"
DC 38 100 62   Lip Protrusion
CS 36 100 64   Palmar Pinch
MD 35 100 64 Middle/Inferior Temporal Gyri Saying "Tah"
TD 27 100 73   Tongue Protrusion
GC 20 100 80   Palmar Pinch
CK 18 100 82   Middle Finger Extension
JC 16 100 84 Basal Temporal Lobe Middle Finger Extension
TJ 12 100 88   Palmar Pinch

Single Channel Detection

Hit % and False % for best channel in each data set

(Average method, top 50 data sets for 18 subjects)

A graph with paired green and red columns for each dataset.  The green columns show the hit percentage and the red columns show the false positive percentages.  For the first half of the graph the red columns do not exceed 20 percent.  In the second half of the graph, they trend upward to approximately 50 percent.  The green columns hover between 100 percent and 70 percent and trend gradually downward.

Location of Best Channels

(HF-Difference > 50)

(data for 18 subjects)

Action Supplementary Motor Area Post- Central Gyrus Pre- Central Gyrus Inter- hemispheric Areas Middle/ Inferior Temporal Gyri Superior Temporal Gyrus Parietal/ Occiptal Lobes Antrior/ Basal Frontal Lobe Premotor Cortex Basal Temporal Lobe
Tongue Protrusion   4 2 3 14 2       1
Puff         1 4        
Sip         2          
Lip Protrusion 1 4 1 2 2   3   1  
Palmar Pinch 2 5 6       2      
Middle Finger Extension 4 4 2       1      
Wrist Extension 1 8 5 1     4 3    
Ankle Extension     1              
Verbalization           2        
Naming         1 1        
Saying "Pah"         4          
Saying "Tah"         4          
Total ECoG yielding HF >50 8 25 17 6 28 9 10 3 1 1
Total # ECoGs for all actions 104 425 412 191 1179 770 1050 969 511 861
% ECoGs yielding HF > 50 7.7 5.9 4.1 3.1 2.4 1.2 1.0 0.3 0.2 0.1

Multiple Channel Examples

3 Channel Average Method Combinations

(15 subjects, top 50 data sets for single channel detection) A column graph where each column has green on the bottom and either red, yellow or nothing on the top.  If there is red on the top, it represents a decrease in HF-difference caused by the multiple detecton method.  If there is yellow on top, it represents an improvement in the HF-difference.  The green represents the original HF-difference (with the red as a subtraction).  Of the 42 columns, 7 have red on top, 34 have yello on top and 1 has nothing on top.  Increases and decreases in the HF-difference can be as much as one third the size of the original HF-difference.

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