[Eeglablist] ERPs from multiple events?

[Andrew Hill]

ok, perhaps a simpler question would be -  is there a way to  
conditionally substitute events in a record, using EEG lab?  for  
example: if events occur 1..2..3 then replace 3 with 10, or if  
1...3...4... replace 3 with 9.

i'm still new to matlab, so maybe manipulating event files should be  
done in a regexp or something, but i've seen a few places to examine  
events / extract epochs in EEGLab, and i don't quite understand all  
the options and workflow to target epochs in a flexible way.

thanks,
andrew

On Nov 13, 2008, at 4:04 PM, Andrew Hill wrote:

> hi folks - new to EEGLab; have a couple of questions.
>
> i've got several Neuroscan .CNT files with embedded events notes
> placed in the recording during a behavioral task, via Eprime.
> discreet cue, stimulus, and response events are recorded, and there
> are several of each type.
>
> thus, a single behavioral "trial" has a cue code, a stimulus code, and
> a response code - all as simple numerical codes, e.g. a cue (10) then
> a stimulus (110) and then a response (100) for instance.
>
> 1) i have a question about creating ERPs for different combinations of
> the codes.
> i believe that ideally i want to create different sets of epochs, e.g.
> grab a chunk of record 500ms before cue through 500 ms post
> response.   so - is it possible to create epochs using more than one
> event type, or specify an epoch that ranges from one event type to
> another?  i've been messing around with the various options and i'm
> not able to do this, so far.
>
> 2) i'm trying to associate channel locations with the .CNT file (or
> it's resultant epocs) but attempts to specify a neuroscan .dat
> (exported ascii version of the .CNT - just times ous) or a manual text
> file is failing (command "eloc" not found) both fail.
>
> any advice?
>
> thanks,
> andrew
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