[FieldTrip] LAYOUT PAIN!

[Simon Little]

Hi,

I would be really very grateful for some help regarding setting layout for
EEG. Im analysing (or trying to!) some clinical EEG 10-20 data on epilepsy
patients and am struggling to get the layout working using the standardised
layout files. My channel names  concur with those of standard EEG 10 -20
systems (see below)  (http://en.wikipedia.org/wiki/10-20_system_(EEG))

Number of questions -

1. The EEG 10-20 standard layout does not seem to match what I thought of
(and have checked online) as the standard 10-20 format. Specifically - it
includes channels Fpz and Oz for example which aren't on the standard
layoutand excludes T3 T4 T5 T6  (
http://en.wikipedia.org/wiki/10-20_system_(EEG))

2. When I check what my layout should be -

>> [type]=ft_senstype(datast_A.label)

type =

ext1020

Yep there is no layout file for ext1020 in the standard layout templates
that seem to come with fieldtrip to use with ft_prepare_layout.

Given that all the channels are I need are in the EEG1010 file, I hoped
that I could use that instead but then I end up with a layout has 80 odd
channels when I only need 21.

I'd be so grateful for any help with this! I'm very sorry if its something
very simple but I have been looking at it for many many hours without any
luck!

Many thanks
Simon Little


My channel names -
'Fp1'
'Fp2'
'F3'
'F4'
'C3'
'C4'
'P3'
'P4'
'O1'
'O2'
'F7'
'F8'
'T3'
'T4'
'T5'
'T6'
'A1'
'A2'
'Fz'
'Cz'
'Pz'



EEG1020 - channel names from lay file.

1 -0.485328 1.493835 0.393101 0.294826 Fp1
2 0.000000 1.570696 0.393101 0.294826 Fpz
3 0.485501 1.493884 0.393101 0.294826 Fp2
4 -1.270781 0.923319 0.393101 0.294826 F7
5 -0.652084 0.812357 0.393101 0.294826 F3
6 0.000000 0.785398 0.393101 0.294826 Fz
7 0.652084 0.812357 0.393101 0.294826 F4
8 1.270781 0.923319 0.393101 0.294826 F8
9 -1.570796 0.000000 0.393101 0.294826 T7
10 -0.785398 0.000111 0.393101 0.294826 C3
11 0.000000 0.000200 0.393101 0.294826 Cz
12 0.785398 0.000111 0.393101 0.294826 C4
13 1.570796 -0.000000 0.393101 0.294826 T8
14 -1.270862 -0.923378 0.393101 0.294826 P7
15 -0.652231 -0.811998 0.393101 0.294826 P3
16 -0.000000 -0.785257 0.393101 0.294826 Pz
17 0.652231 -0.811998 0.393101 0.294826 P4
18 1.270862 -0.923378 0.393101 0.294826 P8
19 -0.485359 -1.493930 0.393101 0.294826 O1
20 -0.000000 -1.570796 0.393101 0.294826 Oz
21 0.485359 -1.493930 0.393101 0.294826 O2
22 -1.570796 1.570696 0.393101 0.294826 COMNT
23 1.570796 1.570696 0.393101 0.294826 SCALE
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