Re: [HCP-Users] A question about the geodesic distance

This question appears to presume a standard mesh meaning some kind of registration has occurred. I think you need to be a bit more specific about what you are wanting to do. Peace, Matt. From: mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Aaron C mailto:aaroncr...@outlook.com>

[HCP-Users] A question about the geodesic distance

Dear HCP experts, I have a question about the geodesic distance with respect to the MSM-All registration. Given a pair of brain vertices, is the variance of their geodesic distance across different subjects still preserved after MSM-All registration? Thank you. ___

Re: [HCP-Users] Smoothing, discarding volumes

To expand on the smoothing issue a bit, even 4mm FWHM spatial smoothing in the volume causes substantial signal mixing between areas on opposite sides of sulci, which sounds like a particularly bad idea for ICA. As I understand it, group ICA shouldn't care much about spatial noise, especially when

Re: [HCP-Users] volume to average surface with Nearest Neighbour interpolation

The fs_LR 32k spheres use a resolution (vertex spacing) that is suitable for 2mm fMRI data, but it sounds like you are using structural-resolution voxels. As Matt says, I would put the fs_LR surface into your volume space, and do only a single mapping, because nearest neighbor or enclosing voxel m

Re: [HCP-Users] Smoothing, discarding volumes

There are few circumstances that one should do unconstrained smoothing in the volume. Peace, Matt. On 1/3/18, 12:53 PM, "hcp-users-boun...@humanconnectome.org on behalf of Tobias Bachmann" wrote: >Hi Stephen, > >Am Mittwoch, 3. Januar 2018, 16:02:06 CET schrieb Stephen Smith: >> > On 3 Jan 2

Re: [HCP-Users] Smoothing, discarding volumes

Hi Stephen, Am Mittwoch, 3. Januar 2018, 16:02:06 CET schrieb Stephen Smith: > > On 3 Jan 2018, at 14:44, Tobias Bachmann > > wrote: > > when using the HCP's ICA+FIX data (NIfTI volume files) for a rather simple > > group ICA, would you recommend further conventional preprocessing, i.e. > > > >

Re: [HCP-Users] volume to average surface with Nearest Neighbour interpolation

I think I would probably resample the subject’s own FS_LR registered surfaces into the FreeSurfer space (an exact transformation) and then do a single mapping from volume to surface. You would need to figure out the affine matrix that describes this transform. Peace, Matt. From: mailto:hcp-

Re: [HCP-Users] Smoothing, discarding volumes

1. I would avoid this. 2. The cleaned data do have some of this artifact removed. Peace, Matt. From: mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Stephen Smith mailto:st...@fmrib.ox.ac.uk>> Date: Wednesday, January 3, 2018 at 9:02 AM To: Tobias Bachmann mailto:tobias.bachm...

[HCP-Users] volume to average surface with Nearest Neighbour interpolation

Dear HCP experts, I am interested in mapping individual voxels in a subject's FreeSurfer conformed space (orig.nii) onto the HCP template (fsaverage_LR) while maintaining the original voxel values. All of the voxels lie within the LH cortical ribbon in the (conformed) volume space. There are 186

Re: [HCP-Users] Delay Discounting

Hi Hae-Min, A detailed description of the delay discounting measure with references is on pp. 183-186 of the HCP Reference Manual. We administered this measure as a custom add on measur

Re: [HCP-Users] Smoothing, discarding volumes

Hi > On 3 Jan 2018, at 14:44, Tobias Bachmann > wrote: > > Dear all, > > when using the HCP's ICA+FIX data (NIfTI volume files) for a rather simple > group ICA, would you recommend further conventional preprocessing, i.e. > > 1. smoothing (about which conflicting info is to be found) spati

[HCP-Users] Smoothing, discarding volumes

Dear all, when using the HCP's ICA+FIX data (NIfTI volume files) for a rather simple group ICA, would you recommend further conventional preprocessing, i.e. 1. smoothing (about which conflicting info is to be found) 2. discarding the first few volumes (I found hardly anything regarding this iss

[HCP-Users] Delay Discounting

Hi Everyone, I couldn't find good details on the administration of the delay discounting measure--it's also not a part of the Penn CNP nor the NIH Toolbox. Was it a custom computerized tool, or done on paper? If it's a computerized tool, is it available to use for our own study? Best, Hae-M