[Eeglablist] ersp times: what are these values and how are they formed?

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Fri Aug 20 18:26:50 PDT 2021


Dear Sean,

I made the answer to your question into an independent section for you as
my previous info was not clear enough.

https://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline#Why_is_my_ERSP.2FITC_data_shorter_than_ERP_epoch.3F_.2808.2F20.2F2021_added.29

You should thank Scott for prompting me to work on it.
If the current description is still unclear, let me know.

Makoto

On Mon, Aug 16, 2021 at 12:29 PM Sean Gilmore via eeglablist <
eeglablist at sccn.ucsd.edu> wrote:

> Dear EEGlab List,
>
> I am using the function 'std_erspplot' to calculate a time frequency
> decompositions for a specified cluster of dipoles. Data from each
> participant contains 60 events, with 30 unique triggers (each stimuli was
> played twice). Each event is epoched into 0sec  - 27.99sec segments.
>
> I have run the std_erspplot function on a specific cluster using this
> syntax.
>
> [STUDY erspdata ersptimes erspfreqs pgroup pcond pinter] =
> std_erspplot(STUDY,ALLEEG,'clusters', cluster)
>
> The output variable ersptimes contains a 1x 200 array of latencies from
> 0.0559 - 1.4443 * 1.0e+04. This array is peculiar because it does not
> correspond to the time points that are defined in the epochs (0 - 28sec).
>
> Does anyone know how ersptimes is calculated? What determines the size of
> this array, and further, why is it is producing this array which doesn’t
> correspond to the times in the epoch.
>
>
> Thanks for your time. Cheers
>
> -
> Sean Gilmore, M.A. (PhD candidate)
> Department of Psychology
> SMART lab
> Ryerson University
>
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