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Hi Knut,

That's a good question.  Anatomically striate cortex is located in the occipital lobe and is identified by a stripe of white matter that runs through the center of it.  While this stripe is visible by the naked eye in gross specimens it is not well visualized on most 1.0 mm isotropic images.  Bruce is correct, the ex vivo images Bruce has been generating would be the best way to identify striate from extrastriate.  

I would say that the "best" operational definition based on our labels would be paracalcarine as V1 (striate) and then cuneus as extrastriate (perhaps also adding superior aspects of lingual region.  On the lateral surface it is much harder.  V1 would be considered the occipital pole and V2 etc rings around the pole.

I hope that helps - best of luck in your work.

--ron

On Thu, Jan 20, 2022 at 11:43 AM Fischl, Bruce <BFISCHL@mgh.harvard.edu> wrote:

Hi Knut

 

Yes, calcarine is a pretty good guess for location of V1, although we also produce an explicit estimate in the *exvivo* label files.

 

And sorry, I don’t know Ron and Rahul’s parcels well enough to say what combo would give you visual cortex

Bruce

 

From: Knut J Bjuland <knutjorgen@outlook.com>
Sent: Thursday, January 20, 2022 9:56 AM
To: Fischl, Bruce <BFISCHL@mgh.harvard.edu>; Freesurfer Mailing List <freesurfer@nmr.mgh.harvard.edu>
Cc: Killiany, Ronald <killiany@bu.edu>
Subject: Re: [Freesurfer] In the Desikan-Killiani parcellatino scheme, which parcellations contain the extrastriate cortex?

 

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Hi Bruce,

 

We're using FreeSurfer data from the parcellations to test hypotheses/models from the literature that include such terms as "extrastriate cortex". It is not always defined - but I guess the most common definition would be visual cortex that is not V1, as you suggest. Now, the lateral occipital cortex parcellation seems to me to contain a lot of extrastriate. Would you say calcarine sulcus = V1? And are there other parcellations, in addition to lateral occipital, that contain parts of visual non-V1 cortex? Thank you!

 

Knut

 

 

 

On 19/01/2022 16:20, Fischl, Bruce wrote:

Hi Knut

 

Can you be more specific about what you mean by extrastriate cortex? Do you mean all visual cortex that is not V1?

 

Bruce

 

From: Knut J Bjuland <knutjorgen@outlook.com>
Sent: Wednesday, January 19, 2022 8:43 AM
To: Fischl, Bruce <BFISCHL@mgh.harvard.edu>; Freesurfer Mailing List <freesurfer@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] In the Desikan-Killiani parcellatino scheme, which parcellations contain the extrastriate cortex?

 

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Dear Bruce Fischl

 

I asked a question on 2021.1.2 about the exstrastriate cortex. Unfortunately, the response I got was a little confusing and didn't really clear it up for me "Including Ron in the conversation. Of course outside striate cortex the mapping between folding and function isn’t so straightforward.". So if you don't mind, I would like to reiterate my question: Which of the desikan-kiliany parcellations correspond to what is termed "extrastriate cortex"? Thank you!

 

Knut Jørgen Bjuland

 

 

 

 

On 02/01/2022 16:58, Fischl, Bruce wrote:

Hi Knut

 

Including Ron in the conversation. Of course outside striate cortex the mapping between folding and function isn’t so straightforward.

 

And Happy New Year to all!
Bruce

 

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Knut J Bjuland
Sent: Saturday, January 1, 2022 8:03 AM
To: Freesurfer Mailing List <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] In the Desikan-Killiani parcellatino scheme, which parcellations contain the extrastriate cortex?

 

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Dear freesurfer experts

In the Desikan-Killiani parcellatino scheme, which parcellations contain the extrastriate cortex?

Knut Jørgen Bjuland

 




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--
Ronald J. Killiany, Ph.D.
Center for Biomedical Imaging
Departments of Anatomy & Neurobiology, Neurology, Radiology and Environmental Health
Boston University School of Medicine and Boston University School of Public Health
700 Albany Street, W701
Boston, Massachusetts  02118

phone:  617-358-8276
fax:  617-638-4922