# [Eeglablist] Question about EEGLAB tutorial

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Tue Oct 6 10:59:18 PDT 2015

```Dear Jason,

> 1-What's the meaning of the word "conditions" in upper section "To
compare event-related EEG dynamics for a subject in two or more conditions
from the same experiment"? In other words, does that mean, if I have
dataset of one participant with 2 events ("rt", and "square"), and  in oder
to compare those events, I need to seperate my data into 2 datasets where
each of them has one event (first dataset is related to the rt event, and
second dataset is related to the square event?

A condition here means independent variable in the experimental framework.
There are within-subject conditions and between-subject (i.e. group)
conditions.

For example, Oddball paradigm typically consists of standard (95%
frequency) and rare (5% frequency) trials. This is a within-subject
condition, and you use repeated measures (or 'paired') for statistics. An
example of between-subject condition is the group difference between
American and Japanese, or those who drink offer vs. black tea, etc.

> 2-Is the term "event-related EEG dynamics" (mentioned up) can be
considered as "event-related potential"?

Right. They don't want to use 'event-related potential' because for the
historical reason it tends to mean trial-averaged line plot of
event-related potentials.

Makoto

On Tue, Sep 29, 2015 at 2:34 AM, jason roger <jasonroger8 at gmail.com> wrote:

> Dear all,
>
> In EEGLAB tutorial under the section "Selecting events and epochs for two
> conditions" was written:
>
> "To compare event-related EEG dynamics for a subject in two or more
> conditions from the same experiment, it is first necessary to create
> datasets containing epochs for each condition. In the experiment of our
> sample dataset, half the targets appeared at position 1 and the other half
> at position 2".
>
> My queations:
> 1-What's the meaning of the word "conditions" in upper section "To compare
> event-related EEG dynamics for a subject in two or more conditions from the
> same experiment"? In other words, does that mean, if I have dataset of one
> participant with 2 events ("rt", and "square"), and  in oder to compare
> those events, I need to seperate my data into 2 datasets where each of them
> has one event (first dataset is related to the rt event, and second dataset
> is related to the square event?
>
> 2-Is the term "event-related EEG dynamics" (mentioned up) can be
> considered as "event-related potential"?
>
> Thanks.
> Jason
>
> _______________________________________________
> 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
>

--
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20151006/c3b8a7b4/attachment.html>
```