By default, iELVis uses/builds on FreeSurfer's system for organizing files. However, we are now in the process of making it possible for iELVis to also read and write files in accordance with the nascent iEEG-BIDS conventions. iEEG-BIDS is a set of conventions for data storage that facilitates robust and reproducible research as well as data and code sharing. The format may still evolve a bit (the initial standard was just submitted for publication in mid-December 2018) but here is an example of a study organized according to the current draft of the iEEG-BIDS format:

https://github.com/bids-standard/bids-examples/tree/bep010_ieeg/ieeg_motorMiller2007

Exporting FreeSurfer Organized iELVis Files into iEEG-BIDS Format:

To copy iELVis electrode information and associate neuroimaging files into iEEG-BIDS format, simply run iELVisFsurf2BIDS.m, by doing something like this:

>> iELVisFsurf2BIDS('PT001','~/Desktop/HandMotor',1);

Where 'PT001' is the patient's FreeSurfer ID, '~/Desktop/HandMotor', is the BIDS root directory that will be created (if it doesn't already exist) and 1 is the session in which the corresponding iEEG data have been recorded. This will create a sub-PT001 folder than contains electrode locations and information and well as the original raw pre- and post-implant brain volumes used for electrode localization.

The other directories created are subfolders of HandMotor/derivatives/iELVis which contain processed anatomical files (e.g., pial surfaces) used for electrode localization and visualization.

Creating iELVis Files from Scratch in iEEG-BIDS Format:

Work in progress.

Reading Data in iEEG-BIDS Format:

Work in progress.