A question about the “Epoch averaging” in BCI P300
Posted: Sat Apr 10, 2021 6:24 pm
A question about the “Epoch averaging” in BCI P300. Sorry for my bad English!
I suppose:
1) 250 hz, then I have a sample every 4 ms.;
2) 4 channels;
3) in “Stimulation based epoching” I set 0-0,4;
4) then, I have this matrix output from “Stimulation based epoching”:
time0 ch1, time0 ch2, time0 ch3, time0 ch4
time0.004 ch1, time0.004 ch2, time 0.004 ch3, time 0.004 ch4
……….
……….
time0.40 ch1, time0.40 ch2, time0.40 ch3, time0.40 ch4
The question is:
if I put the box “epoch average” after the box “Stimulation based epoching”, the averages on what elements are computed?
1) The average is only for column (i.e. for channel), only for row (i.e.for the time) or other?
2) The average is only inside one epoch (what I produced with Stimultaion based epoching, alias the signals from 0 to 0,4 after the stimulation) or also between more epochs?
Thank you very much.
Etc
I suppose:
1) 250 hz, then I have a sample every 4 ms.;
2) 4 channels;
3) in “Stimulation based epoching” I set 0-0,4;
4) then, I have this matrix output from “Stimulation based epoching”:
time0 ch1, time0 ch2, time0 ch3, time0 ch4
time0.004 ch1, time0.004 ch2, time 0.004 ch3, time 0.004 ch4
……….
……….
time0.40 ch1, time0.40 ch2, time0.40 ch3, time0.40 ch4
The question is:
if I put the box “epoch average” after the box “Stimulation based epoching”, the averages on what elements are computed?
1) The average is only for column (i.e. for channel), only for row (i.e.for the time) or other?
2) The average is only inside one epoch (what I produced with Stimultaion based epoching, alias the signals from 0 to 0,4 after the stimulation) or also between more epochs?
Thank you very much.
Etc