[FieldTrip] Which subplot of clusterplot to take?

[Tara van Viegen]

Dear Sebastian,

1) The permutation test identified a significant difference between your
conditions. The extent of the cluster (i.e. the most pronounced difference
between your conditions) is found in the time window that is plotted in the
12 subplots. See
http://www.fieldtriptoolbox.org/faq/how_not_to_interpret_results_from_a_cluster-based_permutation_test
for more information on this.

2) If you do not wish to use 12 subplots in a figure you can simply show
the plot averaged over time points. Note that the clusterplot plots
t-values, so you might want to plot the difference between your conditions
in microvolt or femtotesla for example. That does leave you with the
decision on how to include the spatial extent (i.e. electrodes) of your
cluster. You could show all electrodes that were part of the cluster at any
one time point, or you could plot the electrode size as a function of how
often (i.e. at how many time points) the electrode was part of the cluster.

Hope this helps.

Best,
Tara van Viegen

On Sat, Sep 15, 2018 at 4:35 PM Sebastian Sauppe <sauppe.s at gmail.com> wrote:

> Dear Fieldtrip list members,
>
> I have a question on how to best produce a cluster plot. I have the
> results from a cluster-based permutation test of time-frequency data
> (ft_freqstatistics). When I run ft_clusterplot to visualize where my two
> conditions differ, a larger number of subplots is produced (in my case 12).
> These subplots have different electrodes marked as significant and I guess
> that they represent the development of the significant cluster(s).
>
> I’ve got two questions and hope that someone of you can help with this.
>
> (1) How is the number of subplots determined? I get, for example, 12
> subplots from clusterplot but there are 23 time bins in my data.
> (2) When preparing a plot to include in a paper, which one of the subplots
> should I best take? Or is there a way to combine them to show the fullest
> extent of the cluster? (I think it is not practical to include 12 or more
> subplots in a figure for a paper.)
>
> Here is the plotting code I use:
>
> %% plot the results of permutation test
> % cluster plot
>
>
> % prepare cluster plot
> cfg = [];
> cfg.alpha  = 0.025;
> cfg.zlim   = 'maxmin';
> cfg.layout = 'GSN-HydroCel-129.sfp';
> layout = ft_prepare_layout(cfg);
> cfg.layout = layout;
> cfg.colorbar = 'yes';
> cfg.marker = 'on';
>
>
> % make clusterplot
> ft_clusterplot(cfg, stat);
>
> Best,
> Sebastian
>
> -----------
> Dr. Sebastian Sauppe
> Department of Comparative Linguistics, University of Zurich
> Homepage: https://sites.google.com/site/sauppes/
> Twitter: @SebastianSauppe <https://twitter.com/SebastianSauppe>
> Google Scholar Citations:
> https://scholar.google.de/citations?user=wEtciKQAAAAJ
> ResearchGate: http://www.researchgate.net/profile/Sebastian_Sauppe
> ORCID ID: http://orcid.org/0000-0001-8670-8197
>
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> https://doi.org/10.1371/journal.pcbi.1002202
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