[Eeglablist] time window

[Stephanie Alejandra Armstrong Gallegos]

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