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hmrR_tCCA inner matrix dimensions must agree

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Posts: 8
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(@codina)
Active Member
Joined: 2 years ago

Hi all! We are currently running an experiment exploring brain activity during Yoga asana. Due to the obvious artefacts of movement, especially in inversions, we are using the resting state of each volunteer to regress out artefacts that occur during the process of movement in Asana (using hmrR_tCCA in Homer3 v1.54.0). It appears to be working well for most of the volunteers yet we now have one volunteer who has given us the following error when doing the analysis in Matlab R2017b (Windows 10 Pro for Workstations):

Error

We also attach the groupResults.mat file and screenshots 1 & 2 of the processing stream, as well as the .snirf files that cause the problem.

The volunteer is female, low blood pressure, petit skull and frame. We are unsure if this is an issue with the fit of the cap or some other physiological artefact that we might be able to correct for either in the experiment itself or during the analysis. Any thoughts???

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Posts: 280
(@dboas)
Joined: 3 years ago

@codina

From the error message this is an issue with the dimensions of your auxilliary channels versus your tCCA channels. I would guess that for some reason this subject has more auxiliary channels than the rest.

Alas, we won't be able to debug this for you. It would take us many hours to get our heads around this problem and we just don't have any funding for that. Unfortunately I have not been successful convincing grant reviewers to support our efforts with open source software. It would be great if other people helped with advancing Homer and AtlasViewer, but that hasn't happened either.

David

 

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Posts: 8
Topic starter
(@codina)
Active Member
Joined: 2 years ago

Thank you for your prompt reply Prof. Boas, we'll take a deep look into the auxiliary channels configuration. All subjects wore the same probe with the same configuration, but perhaps the wrong template was chosen. 
I hope you get a succesful grant for open software soon!

Thanks again
Edgar

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