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Bug 1630 - applying average mastoid reference derivation to EEG data
| Status | CLOSED FIXED |
| Reported | 2012-08-06 12:55:00 +0200 |
| Modified | 2019-08-10 11:56:25 +0200 |
| Product: | FieldTrip |
| Component: | core |
| Version: | unspecified |
| Hardware: | PC |
| Operating System: | Windows |
| Importance: | P3 normal |
| Assigned to: | |
| URL: | |
| Tags: | |
| Depends on: | |
| Blocks: | |
| See also: |
Lilla Magyari - 2012-08-06 12:55:28 +0200
hi, I wanted to apply average mastoids reference derivation on my EEG data. The data recorded at each channel is already referenced to the left mastoid (LM), and now I would like to include also the right mastoid in the reference, so I have to re-reference my data. But when I use this configuration of ft_preprocessing: cfg.reref='yes'; cfg.refchannel='RM'; it just simply subtracts RM from each data-point: a'=a-RM. However, I think this is not correct because RM has been already referenced also to LM. Therefore, only RM/2 should be subtracted from each data-point (a'=a-(RM/2)). I can circumvent this problem with using the montage option, but I guess it would be nice to explain this also to other users. Lilla
Lilla Magyari - 2012-08-06 14:39:24 +0200
(In reply to comment #0) I just have discussed this with Robert. It can be done like this: cfg=[]; cfg.implicitref='LM'; cfg.refchannel={'RM','LM'};
Lilla Magyari - 2012-08-06 14:40:02 +0200
so, I close this.