[Eeglablist] Removing Line noise using ICA

[Makoto Miyakoshi]

Dear Nike,

In practice it is difficult to extract the line noise using ICA because the
noise is non-stationary. It is not like muscle attached to the head but
somewhere in the surrounding walls, ceilings, and floors, whose relative
position to the recording system could easily change by subject movement
etc. There may also be non-stationarity in the 50/60Hz AC power in itself
(they are not perfectly sinusoidal--audiophiles care it!)

Remember, one of important ICA's assumptions is stationarity. And the
practical definition of this stationarity of time-series data is tricky.

Makoto

On Tue, Feb 16, 2016 at 12:09 AM, Nike gnanateja <nikegnanateja at gmail.com>
wrote:

> Hi all,
>
> ICA separates the independent components which are presumably from a
> single source. Can't the line noise be considered as a separate source
> component. Won't ICA algorithm output the line noise as independent
> components and can't these components be removed from the data. If yes,
> wouldn't this be the best way to  remove line noise ?
>
> Awaiting your expert comments
>
> Nike
>
> --
> G Nike Gnanateja, MSc (Audiology) <http://goog_636235333>
> Junior Research Fellow,
> Department of Audiology,
> All India Institute of Speech
> and Hearing Mysore-06
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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