[Eeglablist] pop_rmbase timelocking

[Stephen Politzer-Ahles]

Hi Katherine,

The times in pop_rmbase are relative to the time-locking event, rather than
the start of the epoch.

As for your second question, I don't know a way to do this in the EEGLAB
GUI or with built-in functions (although if someone else knows, that would
be great), but it's certainly possible to do it with some code. You would
just need some code that iterates through epochs and, for each epoch,
calculates the mean of some window before the fixation cross (you can find
the latency of the fixation cross using EEG.epoch(i).eventtype and
EEG.epoch(i).eventlatency), and subtracts that value from the whole epoch.

Best,
Steve

On Thu, Oct 4, 2012 at 2:55 AM, Katherine Naish <K.R.Naish at pgr.reading.ac.uk
> wrote:

>   Hi,
>
> When using pop_rmbase, are min_ms and max_ms relative to the start of the
> epoch, or to the timelocking event that the epoch was based around? So, the
> number that are entered as *timerange* if using code- or the numbers in
> the 'baseline latency range' in the pop-up window- if I enter [-500 0] is
> that taking 500ms before the start of the epoch?
>
>
>
> Is there a way to specify a baseline period that is locked round an event
> which isn't always in the same place in the epoch? For example, I am
> interested in what is happening around one event (movement onset), but I
> would like the baseline to be based around the participants viewing a
> fixation cross. But the period between the fixation cross and movement
> onset is variable. Is there a way to specify time points based around the
> fixation cross for the baseline, or does the fact that the time period
> varies present a problem?
>
>
>
> Thanks,
>
> katherine
>
>
>  *~~~~~~~~~~~~~~~~~~~~~~~~*
> *Katherine Naish*
> *PhD student*
> *School of Psychology*
> *University of Reading & Goldsmiths, University of London
> *
> http://www.neurobiography.info/handlab.php?page=people
>
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>



-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://people.ku.edu/~sjpa/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20121004/50bc7fd5/attachment.html>