[Eeglablist] comparing condition and group ERP's from a STUDY

[arno delorme]

Dear Hamish,

some more information about groups and conditions. Optimally:

- All conditions are supposed to be present in all subjects. If not,  
the program should still work but might lead to the empty plots you  
are seeing them right now.
- Groups are supposed to be for different subjects or different  
sessions (different ICA decomposition for sure). Using groups within  
the same subjects (to define a second condition) might work but not  
always. This is pushing the limits of the program.
- You should interpolate missing electrodes. Once more, if you do not  
do that, the program should work but the average will take into  
account different subjects at each channel location.

We are working on these limitations. You will be able to select  
several conditions and/or groups.

Best,

Arno

On 14 oct. 08, at 07:35, Hamish INNES-BROWN wrote:

> Hi EEGLAB list.
>
> I'm currently trying to track down the source of a problem i have  
> plotting condition and group ERP's from the STUDY channel measures  
> menu.
>
> I have all the 'group' and 'condition' data loaded into the  
> EEG.group and EEG.condition.  The correct group and condition  
> numbers pop up in the study info window when all the subjects are  
> loaded into the study..  In EEG.group and EEG.condition the values  
> are strings (but numerals).  I have groups '1' and '2', and  
> conditions '111' and '122'.
>
> The study looks like this
> >> STUDY
> STUDY =
>            name: 'Study1'
>     datasetinfo: [1x58 struct]
>         cluster: [1x1 struct]
>         changrp: [1x63 struct]
>            task: ''
>           notes: ''
>        filename: 'STUDY_ALL.study'
>        filepath: 'D:\_PROJECTS\_FB\_ANALYSIS\__EEGLAB\SET\08STUDY_ALL 
> \'
>         history: [1x3126 char]
>         subject: {1x29 cell}
>           group: {'1'  '2'}
>         session: []
>       condition: {'111'  '122'}
>          setind: [2x29 double]
>             etc: [1x1 struct]
>        preclust: [1x1 struct]
>           saved: 'yes'
>
> Now, when plotting the channel measures, I select "plot conditions  
> on the same panel", and get two plots as expected.  The first (group  
> '1') has two lines, as expected.  One is labelled '111' and the  
> other '122'. All OK.  However underneath there is an empty plot,  
> labelled '2', but with no lines.
>
> I thought this might be somehow a fault in my data or the way the  
> conditions and groups are entered (maybe they should be numbers, not  
> strings?) so I tried loading the example data (5subjects.zip), and  
> added a group variable.  Same problem however.
>
>
> Anyone had any luck with this before?
>
> Many thanks
>
>
>
>
> Hamish Innes-Brown
> Senior Research Officer
>
> The Bionic Ear Institute
> Auditory Clinical Neuroscience Unit
> c/o St Vincents Hospital
> 6th Floor Daly Wing,
> 35 Victoria Pde, Fitzroy Vic 3065
> Tel: +61 3 9288 3523
> Fax: +61 3 6997 7518
>
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