While there is general consensus in terms of what preprocessing steps need to be performed, there is still much debate on the proper order of the steps, and specific parameter settings. We cannot guarantee that the preprocessing pipelines used here are the best, but they were constructed based on several years of expertise in MRI and fMRI analyses, and should be more than sufficient for subsequent analyses. We have setup the ADHD200preproc Forum for users to post questions and discuss issues related to the preprocessing.
The preprocessed ADHD200 data is released without warranty and without the guarantee of support. In the interest of making this data available as quickly as possible, we have not performed quality control on the raw or preprocessed data. We are hoping that the community will help with this process, so please post your QC judgements to the user list so that others may benefit from your quality control efforts. We would also to be thrilled to make available further contributions of preprocessed data -- so please just get in touch if you'd like to generously offer some uploads to the community.