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Bug 2436 - beamforming at the skull
| Status | CLOSED FIXED |
| 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 |
| URL: | |
| Tags: | |
| Depends on: | |
| Blocks: | |
| 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: http://fieldtrip.fcdonders.nl/tutorial/beamformingextended#plotting_cortico-muscular_coherent_sources 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 http://fieldtrip.fcdonders.nl/tutorial/beamformingextended?&#plotting_cortico-muscular_coherent_sources 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
fixed