[Eeglablist] Combining data from different tasks within the same EEG session for ICA

Neil Bailey neil.bailey at monash.edu
Thu May 28 20:43:52 PDT 2015

Hi all

Does anyone have a good sense on whether it would be valid to combine
epochs from the same EEG session, but different tasks in order to maximise
data for ICA decomposition?

I'm aware that feeding more data into the ICA gets better results, and the
data from the different tasks will have similar artifacts to be removed
(eye movement, muscle, line noise). However, the underlying neural activity
will differ between the tasks (for example the Sternberg working memory
task generates a large amount of posterior alpha, while the Go/Nogo task
does not, but does generate a large N2 and P3 component).

Will the differences in the underlying neural activity between tasks
negatively affect the results of the ICA if activity from different tasks
is combined? And will it matter if the epochs from different tasks are of
different lengths?

Kind regards,

Neil Bailey (PhD)
Monash Alfred Psychiatry Research Centre
Neil.Bailey at Monash.edu
(03) 9076 5032
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