Page 1 of 1

How can I plot topological map of P300

Posted: 07 Dec 2011, 12:08
by Yalda Shahriari
Hi,
I want to plot the topological map in offline analysis and I just have 16 channels. I didn't undrestand what I should cut and paste. Please explain more for me. I have an example.m file that has been written by you that in that m.file there is a command "topoplotEEG(vdiff,'eloc64.txt','gridscale',150)" that call eloc64.txt that in this txt file we have:
1 -68 0.3 Fc5.
2 -60 0.219 Fc3.
3 -42 0.14 Fc1.
4 0 0.101 Fcz.
5 42 0.14 Fc2.
6 60 0.219 Fc4.
7 68 0.3 Fc6.
8 -90 0.304 C5..
9 -90 0.203 C3..
10 -90 0.101 C1..
11 0 0 Cz..
12 90 0.101 C2..
13 90 0.203 C4..
14 90 0.304 C6..
15 -112 0.3 Cp5.
16 -120 0.219 Cp3.
17 -138 0.14 Cp1.
18 180 0.101 Cpz.
19 138 0.14 Cp2.
20 120 0.219 Cp4.
21 112 0.3 Cp6.
22 -18 0.406 Fp1.
23 0 0.406 Fpz.
24 18 0.406 Fp2.
25 -36 0.406 Af7.
26 -23 0.343 Af3.
27 0 0.304 Afz.
28 23 0.343 Af4.
29 36 0.406 Af8.
30 -54 0.406 F7..
31 -46 0.363 F5..
32 -35 0.275 F3..
33 -21 0.219 F1..
34 0 0.203 Fz..
35 21 0.219 F2..
36 35 0.275 F4..
37 46 0.363 F6..
38 54 0.406 F8..
39 -72 0.406 Ft7.
40 72 0.406 Ft8.
41 -90 0.406 T7..
42 90 0.406 T8..
43 -90 0.499 T9..
44 90 0.499 T10.
45 -108 0.406 Tp7.
46 108 0.406 Tp8.
47 -126 0.406 P7..
48 -134 0.343 P5..
49 -145 0.275 P3..
50 -159 0.219 P1..
51 180 0.181 Pz..
52 159 0.219 P2..
53 145 0.275 P4..
54 134 0.343 P6..
55 126 0.406 P8..
56 -144 0.406 Po7.
57 -157 0.343 Po3.
58 180 0.304 Poz.
59 157 0.343 Po4.
60 144 0.406 Po8.
61 -162 0.406 O1..
62 180 0.406 Oz..
63 162 0.406 O2..
64 180 0.499 Iz..
that shows the positions of the electrodes. In 16 channel positioning if I have for example Fz, F4, F5, Cz, C4, C5,...
what should I do to change?

Looking forward to your answer.

Regards
Yalda Shahriari

Re: How can I plot topological map of P300

Posted: 07 Dec 2011, 17:10
by jawilson
Yalda,
You just need to find, cut and paste the channels you are using from the eloc64.txt file, and place them in a new text filein the same order as your channels. I would save it in a new file called eloc16.txt, and use that in the topoplot call.
Let us know if you need more help.
adam