[FieldTrip] Value range of power from source analysis (eLORETA)

[Ioana Susnoschi-Luca (PGR)]

Thank you for your quick reply Jan-Mathijs.
I was expecting something similar, but the opposite is true - higher values for higher resolution (i.e. more sources). Would that indicate I made a mistake in either one of the source models?

Ina
________________________________
From: Ioana Susnoschi-Luca (PGR)
Sent: 27 June 2022 22:18
To: fieldtrip at science.ru.nl <fieldtrip at science.ru.nl>
Subject: Value range of power from source analysis (eLORETA)

Hi everyone,

I was comparing my source analysis results for a source and leadfield model with resolution 1mm and one with resolution = 1cm and have noticed big differences in source-level power, as estimated with eLORETA. I am using the standard MRI from the Fieldtrip library.
In the case of res = 1mm, source power ranges between 1-15, while for res = 1cm, power values are much lower, 0.01-0.5. The sensor-level power (from ft_freqanalysis) ranges between 0.01-3.

When changing the model, I specified cfg.unit = 'cm' for the following functions: ft_prepare_headmodel, ft_prepare_sourcemodel, ft_prepare_leadfield. Is it possible I double-scaled somewhere?

Any indication of why this is the case or advice is very much appreciated!

Thanks,
Ina
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