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Bug 2436 - beamforming at the skull

Reported 2014-01-16 12:00:00 +0100
Modified 2019-08-10 12:28:28 +0200
Product: FieldTrip
Component: inverse
Version: unspecified
Hardware: PC
Operating System: Linux
Importance: P5 normal
Assigned to: Diego Lozano Soldevilla
Depends on:
See also:

Diego Lozano Soldevilla - 2014-01-16 12:00:09 +0100

Created attachment 581 plots I was doing DICS in my data and I notice that for some contrasts the functional activations fell at the skull. To check it out, I run the test_tutorial_beamforming_extended.m to see how the plot looked like and see the attached image and compare it with the tutorial one: I don't know since when but in some cases activations are outside the brain. Could somebody give a hint about where should I dig first?

Jan-Mathijs Schoffelen - 2014-01-16 12:12:25 +0100

looks fine to me, Diego! Given the limited spatial resolution of the source reconstruction method it is fine to observe 'outside' brain activations (particular close to the neocortical surface. I wouldn't list this as a bug. It is just a feature of the algorithms we use.

Diego Lozano Soldevilla - 2014-01-16 12:16:08 +0100

(In reply to Jan-Mathijs Schoffelen from comment #1) Thanks Jan-Mathijs. But then why the current plot blob it's more at the skull in comparison with tutorial's figure? This was the main reason I thought might be something is not working...

Jan-Mathijs Schoffelen - 2014-01-25 09:35:22 +0100

Discussed at FT-meeting 22/01/2014: it seems that the discrepancy is caused by the fact that the current figures have been generated with the old-style template grids, whereas the new template grids are defined on slightly different positions. I suggest to replace the figures in the tutorial(s). Diego, would you mind taking this bug and doing this?

Diego Lozano Soldevilla - 2014-01-27 09:31:47 +0100

(In reply to Jan-Mathijs Schoffelen from comment #3) Sure!

Diego Lozano Soldevilla - 2014-01-27 10:19:21 +0100

(In reply to Diego Lozano Soldevilla from comment #4) Changed BTW, What to do with the old figures? I don't know how to delete them in case we've to

Diego Lozano Soldevilla - 2014-01-29 13:18:24 +0100


Robert Oostenveld - 2019-08-10 12:28:28 +0200

This closes a whole series of bugs that have been resolved (either FIXED/WONTFIX/INVALID) for quite some time. If you disagree, please file a new issue describing the issue on