[VBMEG-users:00189] Uniquely estimated dipoles
Alejandra Yamaguchi
I'm facing an issue with number of uniquely estimated dipoles in my program.
When I use VBMEG v.2_1_0_b_1 and I load bayes.mat file and compute " unique(Model.ix) ", I get the same number of vertices as in vb_parm.Njact.
However, when I use VBMEG v.2_2_0_a_0 and I perform the same computation, the number of " unique(Model.ix) " is different from vb_parm.Njact.
I'm using a dipole reduction ratio of 0.42
In general it all seems to be working well, but my only concern is when I need to analyze and label the outputs.
Before taking a deeper look at my scripts and data, I would like to know if this is normal behavior in v.2_2_0_a_0.
Thank you for your time.
Best,
Alejandra.
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Ryosuke Hayashi
The standard brain model differs between VBMEG v2.1 and v2.2.
In the case of v2.1, the model was generated by FreeSurfer v4.5,
in v2.2, the standard brain model generated by FreeSurfer v6.0 is used.
Therefore, the estimated brain vertices are incompatible between these two versions.
This change is to improve the accuracy of the brain model, so we recommend using v2.2.
Best,
ryo
--
ATR脳情報解析研究所 計算脳イメージング研究室
Ryosuke Hayashi(mailto:rhay...@atr.jp)
TEL:0774-95-1217(直通) 内線:1217
Alejandra Yamaguchi
Thank you very much for your prompt reply.
For the test on v2.2, I created the cortical and head model from the GUI using my subject's freesurfer v.6 outputs and the fMRI prior from SPM12 (using old_normalize function).
Is it correct procedure? or, do you think running my analyses completely SPM8 might help with my issue?
Best,
Alejandra.
________________________________
From: vbmeg-users <vbmeg-use...@lists.osdn.me> on behalf of Ryosuke Hayashi <rhay...@atr.jp>
Sent: Wednesday, March 24, 2021 11:09 AM
To: vbmeg...@lists.osdn.me <vbmeg...@lists.osdn.me>
Subject: [VBMEG-users:00190] Re: Uniquely estimated dipoles
Ryosuke Hayashi
Hi! We carefully investigated what you reported yesterday and found it to be a bug in VBMEG v2.2-0-a.0.
> when I use VBMEG v.2_2_0_a_0 and I perform the same computation, the number of "unique (Model.ix)" is different from vb_parm.Njact.
These values and the number of elements must be the same.
Therefore, we have released a fix on our web page. We have also prepared a patch file to update from v2.2-0-a.0 to v2.2-0-a.1, so please download either one. I would appreciate it if you could start over from the estimation.
http://vbmeg.atr.jp/v22
or
https://vbmeg.atr.jp/download/v22/vbmeg_patch_2_2_0_a_0_to_1.zip
> Is it correct procedure? or, do you think running my analyses completely SPM8 might help with my issue?
I asked if there were any members using SPM12 in our lab, but no one was doing with SPM12. If SPM8 compatibility mode works perfectly, I think you can use the analysis result of SPM12. I recommend you to analyze the data of one subject with both SPM8 and SPM12 and compare the fMRI activity imported by VBMEG.
Please refer to the link below for how to capture and display fMRI activity.
https://vbmeg.atr.jp/docs/v22/static/vbmeg_users_manual.html#toc6
Best,
ryo
Alejandra Yamaguchi
Thank you very much. I'll make sure to install the patch and run my analyses from the beginning.
Best,
Alejandra.
________________________________
From: vbmeg-users <vbmeg-use...@lists.osdn.me> on behalf of Ryosuke Hayashi <rhay...@atr.jp>
Sent: Thursday, March 25, 2021 2:19 PM
To: vbmeg...@lists.osdn.me <vbmeg...@lists.osdn.me>
Subject: [VBMEG-users:00192] Re: Uniquely estimated dipoles