[Eeglablist] time window

Arnaud Delorme arno at ucsd.edu
Tue Apr 23 13:12:11 PDT 2019


Dear Stephanie,

What you are saying is that the standard and deviants are the same tone and the only thing that differentiate them is their duration.
In this case, you might want to extract data epoch on the offset (instead of the onset) of the sound. However, I am not sure you will see a standard MMN in this case.

Hope this helps,

Arno

> On Apr 18, 2019, at 7:51 AM, Stephanie Alejandra Armstrong Gallegos <sarmstrong2 at sheffield.ac.uk> wrote:
> 
> Dear all
> 
> I need to set a time window for the analysis of an MMN study. The study
> consisted of an oddball paradigm with auditory stimuli: the standard had a
> duration of 450 msec, and the deviants had 6 different durations, shorter
> than standard: 270, 350, 405 msec; and longer than standard: 495, 540, 630
> msec.
> The papers mention time windows around 100-250 msec. after stimulus onset,
> however in those cases the difference can be identify immediately from the
> start (e.g. the standard is a red dot, the odd is a blue dot); in my case,
> the difference in duration can be only noticed when the shorter stimulus
> has ended.
> So, I’m not sure how to set a time window that works for both the shorter
> and longer conditions. I plotted the data and the response seems to change
> across individuals and channels.
> Any ideas?
> 
> thanks
> -- 
> Stephanie Armstrong
> PhD Researcher
> Psychology Department
> The University of Sheffield
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