- MNE version:1.8.0
Hello everyone
I have a batch of data with line noise, and I want to use ICALABEL to help me identify eye movement and line noise components.
According to ICALABLE’s suggestion, I trained ICA in epochs of 1-100Hz filtering and obtained some components that may be eye movement and line noise.
Afterwards, I should remove these components on epochs of 0.1-30Hz.
But I think this is a bit strange because the 30Hz low-pass filter has already removed high-frequency noise.
Will removing high-frequency noise from the IC again lead to excessive removal?
Or should I remove IC of noise on original raw data
without filter?
Hello, if your data has already been filtered such that line noise is not an issue anymore, why not simply ignore the line noise components that MNE-ICALabel reports, i.e., just don’t remove those. This would be the easiest approach in my opinion. MNE-ICALabel allows you to pick components that are for example related to blinks only.
Best wishes,
Richard
Hello richard,
Thank you for your help!
But
there are still line noise on 10-30hz (looks like)after 0.1-30hz filter , I don`t know what component it is.
Maybe it is not line noise, Have you ever meet this problem?
Thank you again!
Honestly I don’t see anything there
What you can try is remove the line noise components and check what the signal looks like after cleaning
Edit: Oh you mean the generally higher power of those two channels? If you suspect there might be a problem, these channels would actually be candidates for exclusion (i.e., marking them bad) – before ICA!
Thanks richard, Yes, higher power of those two channels.
I will follow your advice and repair them before ICA!
You have answered me more question than my supervisor who focus on social psychology, You are such a nice person. If you come to BeiJing ,I will have you a big meal!
Line noise is a spike on the power spectrum at 50 Hz (EU) or 60 Hz (US) + harmonics, 50, 100, 150, … or 60, 120, 180, …
As suggested by @richard I reocmmend to mark those 2 channels as ‘bads’ and interpolate them later if you need them.
Mathieu