Reversed scalp maps in pop_clustedit when using PCA clustering

[cg091]

Hi,

I am using EEGLAB 2024.0 on MATLAB R2024a (Windows) and I noticed that scalp maps appear reversed (inverted polarity) for some components when viewing clusters in pop_clustedit after running PCA clustering.

Is there a built-in way to align component polarities to the cluster mean, either in pop_preclust or pop_clustedit? The "Absolute values" option in pop_preclust helps for clustering but does not fix the display polarity.

To reproduce the issue:

1. Create a STUDY with multiple subjects and conditions
2. Precompute measures (ERPs + scalp maps)
3. Run pre-clustering (pop_preclust) using ERPs and scalp maps
4. Cluster components
5. Open cluster editor (pop_clustedit) and inspect scalp maps

Thank you!