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Hi, Why would you want to compute DV without at least motion correction? And you need some sort of intensity normalization applied to the data before you compute it, otherwise the scaling is completely arbitrary. I'm afraid that you need to set a threshold based on your specific data. The Power 2014 includes ideas on how you can do that. Note that baseline DV is sensitive to the SNR of your data, which makes it difficult to generalize, since baseline DV will be dependent on your particular scanner protocol, head coil, etc. cheers, -MH -- Michael Harms, Ph.D. ----------------------------------------------------------- Conte Center for the Neuroscience of Mental Disorders Washington University School of Medicine Department of Psychiatry, Box 8134 660 South Euclid Ave. Tel: 314-747-6173 St. Louis, MO 63110 Email: [log in to unmask] On 2/7/14 9:53 AM, "Mauricio Delgado" <[log in to unmask]> wrote: >Dear Mark en Michael, > >One last question though: in his 2014 paper Power suggests a DV threshold >of 20 for pre-regression, though preprocessed, RSFC data. However, I am >eager to know what threshold you would suggest using for uncorrected/raw >RSFC data (i.e. no slice timing, no rigid body, no mode 1000 >normalization, no resampling to 3mm voxels)? > >Any assistance would be more than welcome. > >Thanks in advance for your time and effort! > >All the best, >Mauricio Delgado ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail.