[Eeglablist] Creating new events

[Sid Henriksen]

Dear Arti,

After you have epoched, your trigger data is stored in 
EEG.event(i).type, where i denotes the ith epoch, and which place in the 
sequence of triggers it had is stored in EEG.event(i).urevent. 
EEG.urevent contains all of the triggers with their respective latencies 
used in your experiment. One solution to your problem would be to epoch 
with 32 as the event, and then run this code:

for i = 1:length(EEG.event)
     EEG.event(i).cond = EEG.urevent(EEG.event(i).urevent-1).type
end

This code should iterate through all your epochs, and assign the value 
of the trigger preceding your epoch trigger (32) to EEG.event(i).cond. 
When you subsequently do your ERPs or time-freq analysis, just make sure 
you group your data according to the EEG.event(i).cond.

Best,
Sid

On 03/07/13 07:01, Arti Abhishek wrote:
> Dear list,
> I have the EEG data recorded from the 128 channel EGI system for an 
> auditory experiment. The data contains triggers for the 4 conditions 
> (trigger numbers 1,2,3,4) as well as a trigger from the AV tester 
> (trigger 32). I would like to epoch based on the AV tester trigger. Is 
> there a way to create new events from the existing events (eg: if the 
> trigger 32 is preceded by trigger 1 then the condition is 1 etc..)
> Many thanks,
> Arti
>
>
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