[Eeglablist] Similar ICA components

Ahmad, Jumana jumana.ahmad at kcl.ac.uk
Wed Oct 11 09:51:24 PDT 2017

Hi Mahsa,
Can you calculate your data rank?
It should equal the number of non interpolated electrodes put into the ICA. Did you average reference first? Maybe you average referenced, then ran ICA..... in which case your rank would be out by 1, and you'd get a bogus component. If this happens then I normally see the second component as the inverse of the first.
Let me know if any of this is the case, and I can help further if required.
Best wishes,

On 11 Oct 2017, at 17:39, mahsa shalchy <mahsa.shalchy at gmail.com<mailto:mahsa.shalchy at gmail.com>> wrote:

Dear Experts,

I collected some data using Biosemi system (32 channels) and after doing pre-processing steps (resampling, filtering, re-referencing), I epoched the data and applied ICA.

My problem is that, I'm getting two similar components in my ICA results (IC3 and IC4).

I uploaded related images here:


Could you please help me with this?

Many thanks,
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