[Eeglablist] Similar ICA components

Bernhardsson Jens Jens.Bernhardsson at miun.se
Fri Oct 13 06:05:15 PDT 2017

Just realized that you had 32 channels so you need to set the pca to 31. Sorry.


12 okt. 2017 kl. 22:23 skrev mahsa shalchy <mahsa.shalchy at gmail.com<mailto:mahsa.shalchy at gmail.com>>:

Thank you Jens :)


On Wed, Oct 11, 2017 at 1:56 PM, Bernhardsson Jens <Jens.Bernhardsson at miun.se<mailto:Jens.Bernhardsson at miun.se>> wrote:
Hi Mahsa

You need to reduce the rank of your data by one. This can happen by several reasons, data recorded with common reference and re-referenced to average, gel bridging between electrodes, too low filter setting (low pass). Set the pca option to 32 before Ic analysis to get 32 ic:s instead.

Best wishes

11 okt. 2017 kl. 18:39 skrev mahsa shalchy <mahsa.shalchy at gmail.com<mailto:mahsa.shalchy at gmail.com>>:

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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