Talk:Visual cortex

message: Please note the redundancies in the V2 section and remove them.  — Preceding unsigned comment added by 131.215.9.89 (talk) 21:53, 3 February 2015 (UTC)
thread_title: Redundancy in V2 section

message: What's the "input" of the Visual Cortex? It gets signals from the eyes, are those signals pure "pixel information", are are the pixels detected by the rods and cones already processed into something else by the retina?
:Before the "signal" reaches the visual cortex, it gets processed by the retina, which transforms images in several ways - first of all along specific color axes, and also a general "edge-detection" sort of transformation. Then it runs through the optic chiasm, which repartitions the information from both eyes into right and left hemispheres. THEN it goes to the LGN (which may or may not be considered part of the visual cortex), before going to the VC proper. So, in brief, yes, they are already heavily processed. Graft 04:05, 19 May 2005 (UTC)
replies: text: Graft, thank you for the above reply. At present, the following two consecutive sentences occur in the article (last sentence of first paragraph -> first sentence of second paragraph) and appear to contradict one another on exactly this point: "Visual nerves run straight from the eye to the primary visual cortex to the visual association cortex." / "Visual information coming from the eye goes through the lateral geniculate nucleus in the thalamus and then reaches the visual cortex." Can someone either resolve this, or explain why it's not a contradiction? DSatz (talk) 02:38, 9 July 2020 (UTC)
replies: text: DSatz, thank you for pointing this out, it was indeed incorrect. No visual information from the eyes reaches the visual cortex directly but instead has to synapse somewhere else. In humans and other mammals, this is primarily the lateral geniculate nucleus. I reworded the lead, but it needs further work as of now anyway. Revanchist317 (talk) 16:23, 9 July 2020 (UTC)
thread_title: Question

message: *I merged the info in primary visual cortex to this page and set a redirect on that page to here. Let me know if you have any questions. Semiconscious (talk · home) 09:19, 17 August 2005 (UTC)
replies: text: Maybe there's not much in the separate V sections right now, but it seems to me that there's plenty to be written about each, and thus that they'll deserve their own articles eventually. I'll start expanding MT and see whether people think it needs it's own page. Epugachev 03:36, 3 December 2006 (UTC)
thread_title:  Merge 

message: I encountered this problem in the LGN page and fixed it. It didn't explicitly state there exists a right and a left hemisphere for the LGN, but then made references to ipsilateral vs. contralateral eye.  I researched it a bit and as it turned out there were two sides tot eh LGN.  is it the same case with the visual cortex?  because on page 412 of "from neuron to brain", figure 20.5 makes reference to the "Right primary visual cortex" Paskari 18:15, 18 February 2007 (UTC)
replies: text: Made some changes about this. Myrvin (talk) 14:34, 23 January 2010 (UTC)
thread_title: Uncertain

message: The use of 'time' in para 2 is obscure. The first sentence reads as if things change with the age of the brain. Later, it is not clear when the 'time' starts. Does it start when the photon hits the retina, or maybe when the signal reaches the V1? Myrvin (talk) 14:37, 23 January 2010 (UTC)
thread_title:  V1: Function 

message: The actual articles of the references are missing eg (Angelucci et al., 2003; Hupe et al., 2001)
is it possible to add them to the reference list so readers can follow the papers?
I figured out a few but I could not find the common named ones.  
Angelucci, A., & Bullier, J. (2003). Reaching beyond the classical receptive field of V1 neurons: Horizontal or feedback axons? Journal of Physiology, Paris, 97(2/3), 141-154.
Hupe JM, James AC, Payne BR, Lomber SG, Girard P, Bullier J (1998) Cortical feedback improves discrimination between figure and background by V1, V2 and V3 neurons. Nature 394: 784-787
Hupé J-M, James AC, Girard P, Lomber SG, Payne BR, Bullier J (2001) Feedback connections act on the early part of the responses in monkey visual cortex. J Neurophysiol 
Sillito, A. M., Cudeiro, J. & Jones, H. E. Always returning: feedback and sensory processing in visual cortex and thalamus. Trends Neurosci. 29, 307–316 (2006)
--Achler (talk) 19:16, 30 April 2010 (UTC)
thread_title:  V1: references 

message: There's a very interesting model of V1 using sub-Riemannian geometry, with applications to image disocclusion and inpainting. For example, see articles by Citti-Sarti or Hladky-Pauls. I can write a paragraph if there's interest. Issildur (talk) 22:53, 28 November 2011 (UTC)
thread_title:  Mathematical model of V1 

message: To whom it may concern,(and for the record, I am totally a novice when it comes to editing things on wikipedia, as well as just some random nobody), but it seems that there is a typo in the article in regards to the primary visual cortex, specifically that it is mentioned that V1 has six layers for processing information received from the LGN. I think that this might be a typo in that (assuming I am understanding the material correctly) the LGN has six layers for processing visual information which is then sent to V1. Perhaps someone can confirm this? And feel free to disregard and delete if I am incorrect. Apologies for not following procedure and all that- first time doing this.  — Preceding unsigned comment added by 74.90.17.220 (talk) 02:35, 10 January 2013 (UTC)
replies: text: Hi 74.90.17.220, and welcome to Wikipedia! Once you start editing you'll be a Wikipedia editor and no longer a random nobody.  I'm not that knowledgeable either about the visual system, however, V1 does have six layers. For instance here you can see the six layers (scroll down for a picture). With friendly regards! Lova Falk talk 09:56, 12 January 2013 (UTC)
thread_title: Error?

message: Apologise in advance for awkward grammar, English isn't my first language. Now that that's out of the way... Could you Wikipedians spare a thought for the colourblind Wikipedia users? For instance the picture at the top right of the page shows the different areas in red, orange and yellow which, especially since they appear to be so interwoven, doesn't give me much more information than if just one colour was used.
Maybe someone could change it to blue, green and yellow? That triple has the advantage of being much more visible to me and presumably to other colourblind users as well and retains the characteristic of middle colour is a mix of the other two.
It is admittedly a minor matter, it's not like I am going to perform brain surgery based on a Wikipedia pic, but if information is presented in graphical format, it would be nice if as large a part of users could access that information as is possible, especially since all it would take is a simple change of colours. Quite a few people suffer from a more or less severe form of colourblindness, males being overrepresented as the gene resides on the X chromosome.  — Preceding unsigned comment added by 87.211.115.30 (talk) 16:43, 19 July 2015 (UTC)
thread_title:  Colourblind users 

message: orientation column and ocular dominance column are both articles about stuff in the primary visual cortices.
Maybe someone is able to add this information in an understandable way.
--VeniVidiVicipedia (talk) 20:42, 22 November 2016 (UTC)
thread_title:  columns in v1 

message: *  
- Jytdog (talk) 09:26, 3 April 2017 (UTC)
thread_title:  V4 ref 

message: I removed the inline tags for Gaussian kernels in favor of a citation to an existing reference in the article: see figure 1 for illustrations of Gaussians —Tony Lindeberg (20 Dec 2017) arXiv 1701.02127v5 Figure 1 in http://kth.diva-portal.org/smash/get/diva2:1146265/FULLTEXT03.pdf
The elliptical shapes in Lindeberg Figure 1 are two-dimensional renditions of Gaussian blurs. These represent the 2-dimensional visual filters used by the visual system (i.e., the eye's retina). Mathematically, they are two dimensional Gaussian functions, which, when convolved with the scene, feed a two-dimensional visual snapshot to V1 of the brain. V1 represents the last retinotopic stage (understandable as a photographic snapshot of the scene seen by the eyes). After V1, the scene is encoded. --Ancheta Wis    (talk  | contribs) 01:56, 10 July 2020 (UTC)
thread_title:  Gaussian kernels 

message: If I read this article correctly, V4 is the main bit of the visual cortex linked to colour? So the box about "Colour centre" should really be placed under the heading V4, not where it is currently (V2). MOS:SECTIONLOC This is not my area of expertise so perhaps someone more acquainted with brain stuff could check and edit if necessary. Alternatively, the box titled "Colour centre" could be retitled? The implication to a quick reader (me) was that the Colour centre lives in V2, which I understand (from reading this article) is not the case. Thank you. 45154james (talk) 09:39, 1 May 2023 (UTC)
thread_title:  Colour centre box should be under heading V4? 

message: Hi, I'm student from Uskudar University. I Will edit this article : visual cortex as an assignment for my course: Recent Developments in Biotechnology.
I already completed Wikipedia training modules to be proficient in Wikipedia editing. I would appreciate any support.
Best wishes,
Leen Sarakbi Leen sarakbi (talk) 00:23, 4 January 2024 (UTC)
replies: text: @: As a tip, to speed up your editing, the Wikipedia:Tools/Navigation popups can be enabled in your preferences. In your Preferences>Gadgets, select the checkbox for Navigation popups. Then when you float the screen cursor over a link, its contents will pop up in a little preview box without your having to click the link. --Ancheta Wis    (talk  | contribs) 01:04, 4 January 2024 (UTC)
thread_title:  I'm new editor 

message: Hi, Im student from Uskudar University. I edit this article (Visual cortex) as an assignment for my course (Recent Developments in Biotechnology). I already completed Wikipedia training modules to be proficient in Wikipedia editing. I would appreciate any support. 
Best wishes, 
Leen Sarakbi Leen sarakbi (talk) 20:07, 25 January 2024 (UTC)
thread_title:  I'm new editor 

message: The article states V1 map plasticity too strongly.  There are reports of some degree of plasticity in the adult and a great deal of plasticity in development.  But the current writing gives the (false) impression that the V1 map changes relatively easily - possibly at any age. Wandell (talk) 00:47, 10 February 2024 (UTC)
thread_title:  V1 map plasticity