[Eeglablist] About rank matching during ICA

[Makoto Miyakoshi]

Dear Nabaraj,

> I have 32 channel recording with earlobe A1 and A2 as the reference
channel.

If you use offline-average of A1 and A2 for reference, remove 2 channels to
match the rank. I recommend you run average reference and discard one
channel.

Makoto

On Thu, Nov 6, 2014 at 7:01 PM, nabaraj dahal <nabarajdahal at gmail.com>
wrote:

> Dear list,
>
> I have been reading about removing one channel after rerefrencing  the
> data to average to match the rank before ICA but still confused whether it
> need to be the EEG data or the reference data.
>
> I have 32 channel recording with earlobe A1 and A2 as the reference
> channel.
> After aretefact reduction using ICA , I want to rerefrence the data to
> back to average of A1 and A2.
>
> For the preparaion of ICA, I refrenced all the channnels to the common
> aveage and then run the ICA by excluding on of the reference channel A2 to
> match the rank. But , I still got the warning message:
>
> *Warning: fixing rank computation inconsistency (31 vs 30) most likely
> because running under Linux 64-bit Matlab*
>
> Is there anything to worry about?
> Also, I could not differential one of my component to be artefact or
> cortical componets. I would be grateful if someone could comment ( on the
> component of link below):
>
> https://www.dropbox.com/sh/1o9rba1u62gb400/AACxYSZ9_iJq18svH-DnFiA_a?dl=0
>
> Regards,
> Nabaraj
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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