improve consistency of forward and inverse modeling documentation

[robertoostenveld]

As discussed with @mcpiastra.

The different pages should better use the same terminology, the same (or similar) figures to explain concepts, and link to each other through tags and explicit links in the "see also" sections.

[mcpiastra]

Hi,

some points. I started working on "Tutorial" pages only.
1.
As discussed together, the naming of the sections here

should be more consistent, i.e.,

• Construct a singleshell heamodel for MEG source analysis
• Construct a BEM heamodel for EEG source analysis
• Construct a FEM heamodel for EEG source analysis
• Construct a sourcemodel for MEG or EEG source analysis
• Localizing electrodes using a 3D-scanner
• Reconstruct oscillatory sources in MEG data using a beamformer
• Reconstruct oscillatory sources in combined MEG/EEG data using a beamformer
• Reconstruct visual gamma and cortico-muscular coherence
• Reconstruct event-related fields using minimum-norm estimation
• Reconstruct event-related activity in combined MEG/EEG data with dipole fitting
• Reconstruct epileptic spikes (activity?) in MEG data using a kurtosis beamformer
• Computation of virtual MEG channels in source-space

If I understood correctly, changing the names of the sections above should be done with care because the same name is repeated in several places and there should be consistency.

[mcpiastra]

2. I will focus now on making the content of each of those subchapters mentioned above more consistent and similar to each other (e.g., same list of content, same figures)

[mcpiastra]

3. tags should be checked. Here:

https://github.com/fieldtrip/website/tree/master/_data/tag

I can see that there is "source", "sourceanalysis" and "sourcemodel"; "inverse"; "forward"; "headmodel". Are all needed? E.g., "forward" is used only once, "source" and "sourceanalysis" sound the same.

[mcpiastra]

the figures:
img/shared/tutorial/sourcelocalization_background/source_analysis-03.png
https://www.fieldtriptoolbox.org/assets/img/tutorial/headmodel_meg/headmodel-01.png
are re-drawn in the google slide file. If they are good to go, I will replace them.

[robertoostenveld]

agreed that https://www.fieldtriptoolbox.org/tag/sourceanalysis/ should be merged with https://www.fieldtriptoolbox.org/tag/source/

[robertoostenveld]

I would equate headmodel to forward and prefer the term headmodel, as that is how we call it in the code.