[Eeglablist] Can pop_epoch define epochs using multiple triggers?

Stephen Politzer-Ahles politzerahless at gmail.com
Sun Sep 15 00:51:12 PDT 2019


It sounds like what you need would entail having epochs of variable lengths
(assuming the amount of time between stimulus and awareness rating is not
constant across trials). As far as I know, EEGLAB is not able to handle
variable length epochs, although Fieldtrip is. Alternatively, if you want
to stay within EEGLAB, you could just check the data to see what the
longest latency between stimulus and rating is across all trials in the
dataset, and then use an epoch length long enough to encompass that (and
therefore long enough to encompass both triggers in all the other trials as
well).

---
Stephen Politzer-Ahles
The Hong Kong Polytechnic University
Department of Chinese and Bilingual Studies
http://www.mypolyuweb.hk/~sjpolit/
<http://www.nyu.edu/projects/politzer-ahles/>


On Sat, Sep 14, 2019 at 12:03 AM Renzo Lanfranco <renzo.lanfranco at gmail.com>
wrote:

> Hello and thanks for providing this space!
>
> My question is about the pop_epoch function. Is it possible to define
> epochs in a way that two or more triggers are used? I have a set of 32
> datasets with triggers for stimulus onset, visual discrimination response,
> and subjective awareness rating, always in that order in every trial. I
> want to define epochs so they begin -200 from each stimulus onset and
> finish including the subjective awareness rating trigger, which I will use
> to define conditions in an ERP analysis.
>
> Is this possible to do?
>
> Many thanks,
> Renzo
>
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