Table 1

Relation of topography of the dominant electrode(s) on the scalp with presence of spikes (regular font) and with topography of dominant electrodes (bold font) on the ECoG

Scalp DESubtemporalLateral temporalSSOb
AntMidPostSaSpMaMpIaIp
No1013795788711
3 9 2 4 2 5 5 0 1 0 1
T1/T2810585777611
n=13 80 76.9 71.4 88.9 100 100 87.5 87.5 85.7 100 100
2 6 1 4 2 5 4 0 1 0 1
66.7 66.6 50 100 100 100 80 100 100
A1/A224220232201
n=5 20 30.8 28.6 22.2 28.6 37.5 25 28.6 100
1 2 1 0 0 1 3 0 0 0 1
33.3 22.2 50 20 60 100
T3/T411000000000
n=1 10 7.7
1 1 0 0 0 0 0 0 0 0 0
33.3 11.1
F3/F401100010000
n=1 7.7 14.3 12.5
0 1 0 0 0 0 0 0 0 0 0
11.1
T5/T622221112210
n=2 20 15.4 28.6 22.2 20 14.3 12.5 25 28.6 100
0 1 1 0 0 1 1 0 1 0 0
11.1 50 20 20 100
  • The left most column shows the topography of dominant electrodes on the scalp. The other columns show the number (non-italics) and proportion (italics) of patients showing spikes (regular font) and largest spikes (bold font) at the corresponding topographies on the ECoG. The top rows of numbers (No) represent the number of patients presenting spikes (regular font) or largest spikes (bold font) at the corresponding location on the ECoG. The rest of the cells show the number of patients presenting scalp discharges with a dominant electrode indicated on the left column and presenting ECoG spikes (regular) or largest ECoG spikes (bold) at the topographies indicated by the lables on the top. The numbers in italics indicate the same figure as a proportion of the total number of patients presenting spikes (or largest spikes) at the corresponding location in the ECoG (top row of numbers). For instance, among the patients with dominant electrodes at T1/T2, eight patients showed spikes in the anterior aspect of the superior temporal gyrus (representing 88.9% of all patients showing spikes in this region on the ECoG), and only five in the posterior aspect of the same gyrus (representing 100% of all patients showing spikes in this region). In other words, 88.9% of patients showing spikes in the anterior aspect of the superior temporal region and all patients showing spikes in the posterior aspect of the superior temporal region had largest spikes at T1/T2 on the scalp. DE=dominant electrode on the scalp; ant=anterior subtemporal; mid=midsubtemporal; pos=posterior subtemporal; Sa= anterior aspect of the superior temporal gyrus; Sp=posterior aspect of the superior temporal gyrus; Ma= anterior aspect of the mid temporal gyrus; Mp=posterior aspect of the mid temporal gyrus; Ia= anterior aspect of the inferior temporal gyrus; Ip=posterior aspect of the inferior temporal gyrus; SS=suprasylvian; Ob=orbital.