Connectivity Matrix from Database Same Across Groups?

[Ivan Campbell]

Hi all,

I was creating connectivity matrices for three groups in my study using their databases. However, when I produced the connectivity matrices for these groups they ended up being exactly the same as one another. I looked at other databases I've made and they differed from these, but the three databases from this study are exactly the same. Any idea as to why that could be? And is there a better way for me to compare connectivity matrices between these groups?

Thank you,

Ivan

[Frank Yeh]

Could you elaborate more about how you generate the connectivity
matrices? (e.g. the command line you used and the log output).

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[Frank Yeh]

BTW, to generate a connectivity matrix, you may need to use an
individual's FIB file, not the database, because all databases are
based on the HCP1065 template, which is going to give you identical
whole brain tractography and thus the same "connectivity matrix."

Moreover, I would recommend using autotrack results to generate
tract-to-region connectivity matrix instead of using whole brain
tractography to derive connectivity matrix.

Best regards,
Frank

[Ivan Campbell]

Dr. Yeh,

I did it via gui, I created the database files separately for each group via step C1 and opened them under Step T3. I went Fiber Tracking under Step Td3>Tracts>connectivity matrix>FreeSurferDKT_Cortical>Recalculate>Save connectogram

Here is my command history: 

open_fib
database.dz

set_zoom
0.5

run_tracking
whole_brain
c9A99193Fb803FdbF041b4843c40420Fba803FcCDCC4C3Ec

I created the database files separately for each group via step C1 and opened them under Step T3. I went Fiber Tracking under Step Td3>Tracts>connectivity matrix>FreeSurferDKT_Cortical>Recalculate>Save connectogram

I did this process for each database of the 3 groups and they all had the exact same numbers

[Ivan Campbell]

Just saw the updated message, that makes sense. Thank you!