[Eeglablist] ERSP baseline question

[赵远方]

As in my opinion,if your baseline is not stable in itself (just as in your
case of time-locking to foot step),even if you substract it,you can still
see dramatic activity change during the baseline time.Maybe choosing
another more stable baseline can solve this problem.

在 2012年4月4日 下午9:31， <jekline at umich.edu>写道：

>
> Hello, I am creating ERSP plots using epoched EEG data and I had a
> question. I collected data on subjects walking and performing a cognitive
> task.
>
> 1. I epoched around each step with the left foot. I created component ERSP
> plots through the GUI with the prestimulus baseline removed. I still see
> activity (areas of higher or lower power from baseline) in the prestimulus
> baseline. Is something going wrong? If I'm subtracting the baseline,
> shouldn't there be no visible change in activity during the baseline time.
> Thanks for any help.
>
> Julia
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-- 
Yuan-Fang Chao
School of Psychology
SouthWest University
Beibei,Chongqing,China
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