[Eeglablist] ICA on continuous data - eye artifact component

[Makoto Miyakoshi]

Dear Ida,

>Third mentioned diagram is shown with dimensions: 200 trials and 810 ms on
y and x axis respectfully (image is in the attachment) - why exactly these
values are taken? Could I change those?

These are chosen arbitrarily. This plot is called ERPimage, and as you can
see in its naming, the plot is to show trial-by-trial event-related phase
and amplitude structure. Since your data are continuous, the function
determined a good number to chop up your data to make them aligned in the
box.

If you see a 'column' (or 'slope') in the ERPimage that means there was
phase-locking event. Do you see it?

Makoto

2013/3/30 ida miokovic <ida.miokovic at gmail.com>

> Dear list,
>
> I run ICA on continuous data and now am interested into removal of the
> components that represent eye and muscle artifacts (and some other if
> recognized).
>  When I go through Tools --> Reject data using ICA --> Reject components
> by maps there is possibility for me to see Activity power spectrum, 2D
> location of component presence and time - trials diagram. Third mentioned
> diagram is shown with dimensions: 200 trials and 810 ms on y and x axis
> respectfully (image is in the attachment) - why exactly these values are
> taken? Could I change those?
>
>  Since it is IC1 that is shown, I expect it to be most likely an eye
> artifact, but I am confused about the look of the third diagram - it does
> not look like eye artifact should  and blinks are not visible as shown in
> EEGLAB tutorial about ICA. Am I missing somenthing? maybe it is because of
> only 800 ms of the dataset on x axis?
>
> Thanks
>
> Ida
>
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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