Discontinuous patches near pinwheel centers in orientation map

[WaveformDai]

Hi,

I'm currently using your code to analyze ISI data for orientation map rather than retinotopic map. The paradigm is the same as that in Kalatsky & Stryker's paper, which means that I run both clockwise and counterclockwise experiment.

Based on your code, I can get well-organized orientation map. But there are some discontinuous patches around pinwheel centers as is shown in attached figure. I noticed that in the file Gprocesskret_batch.m line 27 to line 64, your first do low-pass/high-pass filtering on raw data and then you obtain the absolute map and delay map.

Are these discontinuous patches caused by separate filtering of raw data from different conditions, which may differently(slightly) displace the position of pinwheel centers from these two different conditions, and later subtraction may enlarge this displacement and cause such discontinuous patches? Or are these patches just resulted from inappropriate parameters of filtering? Have you ever encountered this same problem when calculating the absolute retinotopic map?

Thank you for your help!

[ajuavinett]

Hi, unfortunately we have only used this code for retinotopy, never orientation maps. It sounds like your intuition is right. We do a subtraction in order to account for the delay (as in Kalatsky & Stryker) but that really only works for 2 directions -- I can imagine this might cause distortion in the middle of the pinwheel. Filtering could also be to blame - I'd recommend changing these parameters to see if that makes a difference. Good luck!

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On Tue, Jan 30, 2018 at 8:43 AM, WaveformDai ***@***.***> wrote: Hi, I'm currently using your code to analyze ISI data for orientation map rather than retinotopic map. The paradigm is the same as that in Kalatsky & Stryker's paper, which means that I run both clockwise and counterclockwise experiment. Based on your code, I can get well-organized orientation map. But there are some discontinuous patches around pinwheel centers as is shown in attached figure. I noticed that in the file Gprocesskret_batch.m line 27 to line 64, your first do low-pass/high-pass filtering on raw data and then you obtain the absolute map and delay map. [image: 1517318831] <https://user-images.githubusercontent.com/14290870/35568844-3ce3de04-05c2-11e8-8a9b-d3676f86ce2e.jpg> Are these discontinuous patches caused by separate filtering of raw data from different conditions, which may differently(slightly) displace the position of pinwheel centers from these two different conditions, and later subtraction may enlarge this displacement and cause such discontinuous patches? Or are these patches just resulted from inappropriate parameters of filtering? Have you ever encountered this same problem when calculating the absolute retinotopic map? Thank you for your help! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG01hsOI_OEUb_OQdNscDmYWqew0lT23ks5tPxx9gaJpZM4RyWOz> .

-- ashley juavinett, phd @analog_ashley