Regarding the judgment method of Ez

[lala z]

Hello, I read some papers about BVEP, and I found that some papers use the posterior distribution of the epileptogenicity parameter η to judge EZ, while some by finding the time instant where depolarization shift occurred in the model-predicted activity of the fast
variable (x), what is the difference between these two methods?

[WOODMAN Michael]

hi

Can you please provide references / links?

thanks,

Marmaduke

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From: 'lala z' via TVB Users <tvb-...@googlegroups.com>
Sent: Monday, December 5, 2022 2:17:57 PM
To: TVB Users
Subject: [RESEAUX SOCIAUX] [TVB] Regarding the judgment method of Ez

 

Hello, I read some papers about BVEP, and I found that some papers use the posterior distribution of the epileptogenicity parameter η to judge EZ, while some by finding the time instant where depolarization shift occurred in the model-predicted activity of the fast
variable (x), what is the difference between these two methods?

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[lala z]

Hello,

These two articles are respectively Identifying spatio-temporal seizure propagation patterns in epilepsy using Bayesian inference， Fully Bayesian estimation of virtual brain parameters with self-tuning Hamiltonian Monte Carlo , different methods are used to judge EZ, so I don't know which method is more appropriate to judge EZ
Looking forward to your reply,

thanks!

lala

[WOODMAN Michael]

Hi,

The primary difference of interest between these papers is that the first one uses maximum a posteriori estimate with optimization, which provides a single value for the parameters, while the second paper uses Stan's Hamiltonian Monte Carlo (HMC) to sample parameter values.  The latter provides better results in principle. In practice, it is useful to do some checks with optimization and then HMC. 

You are right the papers do not use the same method for evaluating EZ, so you should choose the one which works best for your data.

cheers,

Marmaduke

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From: 'lala z' via TVB Users <tvb-...@googlegroups.com>

Sent: Tuesday, December 6, 2022 3:51:08 AM
To: TVB Users
Subject: [RESEAUX SOCIAUX] Re: [RESEAUX SOCIAUX] [TVB] Regarding the judgment method of Ez

 

Hello,

These two articles are respectively Identifying spatio-temporal seizure propagation patterns in epilepsy using Bayesian inference， Fully Bayesian estimation of virtual brain parameters with self-tuning Hamiltonian Monte Carlo , different methods are used to judge EZ, so I don't know which method is more appropriate to judge EZ
Looking forward to your reply,

thanks!

lala

在2022年12月6日星期二 UTC+8 04:40:33<marmaduke.woodman> 写道：

hi

Can you please provide references / links?

thanks,

Marmaduke

---

From: 'lala z' via TVB Users <tvb-...@googlegroups.com>
Sent: Monday, December 5, 2022 2:17:57 PM
To: TVB Users
Subject: [RESEAUX SOCIAUX] [TVB] Regarding the judgment method of Ez

 

Hello, I read some papers about BVEP, and I found that some papers use the posterior distribution of the epileptogenicity parameter η to judge EZ, while some by finding the time instant where depolarization shift occurred in the model-predicted activity of the fast
variable (x), what is the difference between these two methods?

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