External Email - Use Caution 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 <bfis...@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 <knutjor...@outlook.com> > *Sent:* Thursday, January 20, 2022 9:56 AM > *To:* Fischl, Bruce <bfis...@mgh.harvard.edu>; Freesurfer Mailing List < > freesurfer@nmr.mgh.harvard.edu> > *Cc:* Killiany, Ronald <killi...@bu.edu> > *Subject:* Re: [Freesurfer] In the Desikan-Killiani parcellatino scheme, > which parcellations contain the extrastriate cortex? > > > > * External Email - Use Caution * > > 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 <knutjor...@outlook.com> <knutjor...@outlook.com> > *Sent:* Wednesday, January 19, 2022 8:43 AM > *To:* Fischl, Bruce <bfis...@mgh.harvard.edu> <bfis...@mgh.harvard.edu>; > Freesurfer Mailing List <freesurfer@nmr.mgh.harvard.edu> > <freesurfer@nmr.mgh.harvard.edu> > *Subject:* Re: [Freesurfer] In the Desikan-Killiani parcellatino scheme, > which parcellations contain the extrastriate cortex? > > > > * External Email - Use Caution * > > > 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-boun...@nmr.mgh.harvard.edu > <freesurfer-boun...@nmr.mgh.harvard.edu> > <freesurfer-boun...@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> > <freesurfer@nmr.mgh.harvard.edu> > *Subject:* [Freesurfer] In the Desikan-Killiani parcellatino scheme, > which parcellations contain the extrastriate cortex? > > > > * External Email - Use Caution * > > Dear freesurfer experts > > In the Desikan-Killiani parcellatino scheme, which parcellations contain > the extrastriate cortex? > > Knut Jørgen Bjuland > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > > *MailScanner has detected a possible fraud attempt from > "secure-web.cisco.com" claiming to be* > https://secure-web.cisco.com/1ep1AuCCrset1hRlvt7iWb-GaDUYi13VhTYIU4cXSJ_nBAzyT9qQEfaIwciy67R4FS_WLAQ-DER5JxzMzxdcJbQjBtIjKtchoXktdoowTTg6ejZlM2UJhlhWIqQEf-_L0wd5XBHYKYt_rsl74JqC0U91D9RNvvB4F6hezaaovBLXCJCehLMzFFJmzbt13xec0TjDe6x_TWVScd9l3s5PlN3QsEZyOzW3EOslHNehPaoceoeXVmyFKnRcGv2g4eef5vLUz0UxIQ0Uaq4hYMBoEVnsoQDykMsRaUuQhWQLbi7G56HHYKjxeYxPdh-9j4N63CFchPp8GQ8c-yy11uUNLRPcwaEREX39EVH_eIL2WwWg/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer > > <https://secure-web.cisco.com/12eZOPxm3AlJOZ3x0Zycb2-752ofa5vDWM53JrbnwhCNcBAOuffPiNQn0cuj7sdvzTzATqtA3AYElTlb2u1sG3FiO1pUcnjBfNfflFkF9CcRKDHMeQUsJZcpL-5YS-e-iPmgJcsMq7DE1DUXvrdCo0lIXmV2jfCRIrAGk0OPUAR_Wjo9_ypLBreA_st1sq_rldPddRKLZdeKppCY2YMc2kdTyam8zytCPGdebPxZO-qe5DRe8ix2VoXHUsa44AhmbLwLzdINwbfDEI3DzO84HE6mJ2YKo5P4Z1R4T0a5haEuqYoT0rYjYowIVBkAJmBkB/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer> > > The information in this e-mail is intended only for the person to whom it is > addressed. 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Continuing to send or respond to > e-mail after receiving this message means you understand and accept this > risk and wish to continue to communicate over unencrypted e-mail. > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://secure-web.cisco.com/1ep1AuCCrset1hRlvt7iWb-GaDUYi13VhTYIU4cXSJ_nBAzyT9qQEfaIwciy67R4FS_WLAQ-DER5JxzMzxdcJbQjBtIjKtchoXktdoowTTg6ejZlM2UJhlhWIqQEf-_L0wd5XBHYKYt_rsl74JqC0U91D9RNvvB4F6hezaaovBLXCJCehLMzFFJmzbt13xec0TjDe6x_TWVScd9l3s5PlN3QsEZyOzW3EOslHNehPaoceoeXVmyFKnRcGv2g4eef5vLUz0UxIQ0Uaq4hYMBoEVnsoQDykMsRaUuQhWQLbi7G56HHYKjxeYxPdh-9j4N63CFchPp8GQ8c-yy11uUNLRPcwaEREX39EVH_eIL2WwWg/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer -- 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
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