[Eeglablist] Automated way of placing events

[Marco Montalto]

Dear Arno,

I have tried the script you supplied me with but found a problem with it. The first part of the script (EEG=pop_select….) treats the data file as one continuous dataset; it ignores the events that mark the beginning and end of a trial. I would like to remove the first and last ten seconds within the boundaries of a trial delimited by the events marking the beginning and end of a trial. As it is the script merely removes the first 10 seconds of the continuous data and last ten seconds of the same continuous data. Let's say A marks beginning of trial 1 and B marks the end of the same trial - I would like to remove the first and last 10 seconds within the block marked by events A and B. And so on for the rest of trails within the same data file. Is this possible? Is there a way of doing this by using some script? Any help you could provide me with would be greatly appreciated.

Thanks and regards,
Marco

On 11 May 2012, at 05:54, Arnaud Delorme wrote:

> Hi Marco,
> 
> to do what you want to do, you should type in
> 
> EEG = pop_select(EEG, 'time', [10 EEG.xmax-10]); % remove the first and last 10 seconds
> EEG = eeg_regepoch(EEG, 'recurrence', 2); % divide into 2 seconds non-overlaping blocks
> 
> Best,
> 
> Arno
> 
> On May 5, 2012, at 6:38 PM, Stephen Politzer-Ahles wrote:
> 
>> Hi Marco,
>> 
>> I haven't tried this myself, but you should be able to get any of these epochs from the same event using pop_epoch. Assuming that you have an event marking the beginning of the block, then the first epoch you want (i.e. 10-12 seconds after the event) would be
>> 
>> OUTEEG = pop_epoch( EEG, {events}, [10 12]);
>> 
>> the second would be
>> 
>> OUTEEG = pop_epoch( EEG, {events}, [12 14]);
>> 
>> etc.
>> 
>> Best,
>> Steve
>> 
>> On Sat, May 5, 2012 at 4:33 PM, Marco Montalto <montaltomarco at onvol.net> wrote:
>> Dear List,
>> 
>> In my experiment I have three conditions and each trial is 30 seconds long. I ignore the first and last 10 seconds of each block and the middle 10-second block I divide into epochs of 2-second duration. Currently I am doing this manually through the EEGLAB GUI by placing an event (with the same 'type' for blocks from the same condition) at every two seconds (in the middle 10-second block) and then extracting epochs around those events. Would anyone know whether there is a more automated and a faster way of doing this? Thanks in advance.
>> 
>> Regards,
>> Marco Montalto
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>> 
>> 
>> -- 
>> Stephen Politzer-Ahles
>> University of Kansas
>> Linguistics Department
>> http://www.linguistics.ku.edu/
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