Question about downloading S900 GroupAvg dense connectome

[Yifei Ren]

Dear HCP team,

I am trying to access the S900 820-subject group-average dense functional connectome:

HCP_S900_820_rfMRI_MSMAll_groupPCA_d4500ROW_zcorr.dconn.nii

The old ConnectomeDB REST URL no longer works:
https://db.humanconnectome.org/data/projects/HCP_Resources/resources/GroupAvg/files/HCP_S900_820_rfMRI_MSMAll_groupPCA_d4500ROW_zcorr.zip

Could you please let me know where this legacy S900 GroupAvg resource is still available for direct download?

Thank you.

[Elam, Jennifer]

Hi Yifel,

The original ConnectomeDB was taken down in September 2025 and has been replaced with ConnectomeDB powered by BALSA and the HCP-YA data has had additional processing and been released as the "HCP-YA 2025" data there. We recommend using the 2025 data in analyses going forward. We plan to release more group average data with this better processing and more up to date analyses, but we don't have a current ETA due to other priorities.

The HCP_S900_820_rfMRI_MSMAll_groupPCA_d4500ROW_zcorr.zip archive (and it's S1200 version) both derived from the older released data are still available from the HCP-YA AWS S3 bucket. 

To get access, you will need to register on balsa.wustl.edu. After registration, click on ConnectomeDB>HCP-Young Adult 2025 and agree to the Terms. Then click on Set/Reset AWS Credentials to get a AWS access key for the HCP bucket. You can find instructions for using the access key under the heading "Connecting to AWS Data Using These Credentials" on https://wiki.humanconnectome.org/docs/How%20To%20Connect%20to%20Connectome%20Data%20via%20AWS.html

Once you are in S3 go to hcp-openaccess>HCP_Resources>GroupAvg and select the file you want to download.

Best,

Jenn

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From: Yifei Ren <yifei.h...@gmail.com>
Sent: Friday, May 8, 2026 10:18 AM
To: HCP-Users <hcp-...@humanconnectome.org>
Subject: [hcp-users] Question about downloading S900 GroupAvg dense connectome

 

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