Dear Ce,
im not a visual neuroscientist either. I needed it once for a study, where I cooperated with visual neuroscientists from elsewhere, who where very good at this. That's why I roughly know the procedure.
In a nutshell it boils down to showing expanding disks in 1 sessions and rotating wedges in another (shouldn't be hard to program in PsychoPhysics Toolbox or Presentation), during high resolution occipital fMRI recording. After this you fit a sine and cosine of the same temporal frequency to the data. Phase and amplitude of that fit per voxel then tell you what excentricity is encoded, and what polar angle. This can then be color coded onto a flatmap of the occipital lobe (for example with Caret), and borders are delineated manually. But for the details I hope you can find the help of a real visual neuroscientist, I'm not the right person to ask.
There are more elaborate methods though, but the above one seems popular due to its simplicity. Alternatives are, for example, population receptive field methods (read the work by Dumoulin et al).
Perhaps some more reading will help. This one looked good:
http://www.ncbi.nlm.nih.gov/pubmed/12498741
Or try:
http://www.ncbi.nlm.nih.gov/pubmed?term=retinotopy%20human%20fmri
Good luck,
Bas
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Dr. S.F.W. Neggers
Division of Brain Research
Rudolf Magnus Institute for Neuroscience
Utrecht University Medical Center
Visiting : Heidelberglaan 100, 3584 CX Utrecht
Room B.01.1.03
Mail : Huispost B01.206, P.O. Box 85500
3508 GA Utrecht, the Netherlands
Tel : +31 (0)88 7559609
Fax : +31 (0)88 7555443
E-mail : [log in to unmask]
Web : http://www.neuromri.nl/people/bas-neggers
: http://www.brainsciencetools.com (CEO)
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________________________________________
From: [log in to unmask] [[log in to unmask]]
Sent: Thursday, August 09, 2012 2:44 PM
To: Alexander Hammers; Neggers, S.F.W.; SPM
Subject: 回复:Re:_[SPM]_回复:Re:_[SPM]_回复:Re:_[SPM]_How_to_create_Subject-Wise_Anatomical_ROI
Dear Alexander,Bas,
Thank you for your insightful advice. It seems to me that performing retinotopic mapping to delineate visual cortex is the best option. However, the thing is that I am not a well-trained visual neuroscientist... Therefore I am wondering whether anyone could send me the stimuli needed for retinotopic mapping because I am not quite familiar with the procedure and the stimuli design of retinotopic mapping. And the sad thing is that I need to identify V1 V2 V3 individually in one of my studies.
Many thanks and best regards,
Ce
----- 原始邮件 -----
发件人:Alexander Hammers <[log in to unmask]>
收件人:Ce Mo <[log in to unmask]>
抄送人:[log in to unmask], Bas Neggers <[log in to unmask]>
主题:Re:_[SPM]_回复:Re:_[SPM]_回复:Re:_[SPM]_How_to_create_Subject-Wise_Anatomical_ROI
日期:2012年08月08日 00点39分
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