AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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February 13, 2023 11:41PM
Since the time series was thresholded into a binary spike time series in step 1, the ROI average is indeed the fraction of voxels that are spikes at each time point. It is not the average spikiness, but the average of the spiked voxels.

For example, if at some time point 40% of the ROI voxels are 1.5 and 60% are 3, the binarized time series will have 40% of the voxels at 0 and 60% at 1, since they are thresholded at 2.5. And then the ROI average will be 0.6, the fraction of voxels that seem "bad". Note that the values in this average time series are always in [0,1].

Does this seem reasonable?

- rick
Subject Author Posted

what measure is recommended to summarize "spikiness" in an area

carolin31 August 04, 2022 10:29PM

Re: what measure is recommended to summarize "spikiness" in an area

ptaylor August 05, 2022 10:14PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 August 15, 2022 04:02PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 December 21, 2022 01:45PM

Re: what measure is recommended to summarize "spikiness" in an area

ptaylor December 23, 2022 09:15AM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 January 12, 2023 08:54PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 January 23, 2023 05:22PM

Re: what measure is recommended to summarize "spikiness" in an area

ptaylor January 24, 2023 08:18AM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 January 25, 2023 08:54PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 February 08, 2023 08:04PM

Re: what measure is recommended to summarize "spikiness" in an area

rick reynolds February 08, 2023 08:34PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 February 10, 2023 04:12PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 February 13, 2023 10:49PM

Re: what measure is recommended to summarize "spikiness" in an area

rick reynolds February 13, 2023 11:41PM

Re: what measure is recommended to summarize "spikiness" in an area

carolin31 February 14, 2023 01:43PM

Re: what measure is recommended to summarize "spikiness" in an area Attachments

carolin31 March 06, 2023 03:20PM