How to locate the ROI using Inkscape

[sunjc73]

I want to plot the outline of a ROI in Inkscape when I execute cortex.add_roi(). So how to locate the area of the ROI accurately. I think a data should be sent to cortex.add_roi() as a reference, but I'm not sure which data should be.

Thanks in advance.

Jiancheng Sun

[marklescroart]

Pardon the very late reply. The add_roi function is meant to add a pycortex volume of localizer data to the SVG file. This shows up as a cortical map of whatever was in the statistical volume. The data you pass can be, for example, a retinotopic map (to draw boundaries around retinotopically defined areas) or a T contrast btw face stimuli and objects (to localize FFA / OFA). In other words, you pass in analyzed localizer data to a pycortex Volume object, add_roi() creates a flatmap of that Volume in the overlays.svg file, and then you manually draw your ROI in the SVG file wherever you wish. There has been some work in our group on automatically defining ROIs based on localizer data, but none of it is sufficiently reliable yet to replace human expertise.