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![]() | The contents of the Dorsomedial area page were merged into Visual cortex on 20 April 2014. For the contribution history and old versions of the redirected page, please see its history; for the discussion at that location, see its talk page. |
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)Reply
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?
Anybody care to explain what the section V2 warning
This article contains weasel words: vague phrasing that often accompanies biasedorunverifiable information. Such statements should be clarified or removed. (March 2009)
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refers to?
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) Yes that's correct. Jjhunt 11:47, 17 July 2007 (UTC)Reply
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)Reply
The reference I want to add about connections (direct and via pulvinar) from V1 to V2 is : Sincich L.C. & Horton J.C. The circuitry of V1 and V2:Integration of Color, Form and Motion Ann. Revs Neurosci. 28 303 (2005) —Preceding unsigned comment added by 204.236.73.246 (talk) 22:00, 18 April 2010 (UTC)Reply
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)Reply
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)Reply
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)Reply
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)Reply
I think the lead section should be more specific about what kind of brain is discussed in the article. Now this article give the illusion that all brains are structured in the same way.
I can think of two things that can be done to solve this problem:
VeniVidiVicipedia (talk) 14:28, 7 October 2016 (UTC)Reply
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)Reply
I'm experiencing something visually that I think is interesting, and I came to this page to see whether it's a well-known phenomenon. I quickly got lost in the weeds and gave up. So I'm just going to say what I'm seeing, and others can respond or not.
I have had cataract surgery in my left eye. The surgery in my right eye has been postponed for various reasons. So I have had several weeks to observe this. If I look out a window on an overcast day, the right side of my visual field (dominated by my left eye) registers as true color; the left side (dominated by the eye that still has a cataract) has a distinct yellow cast to it. This is to be expected.
Here's the thing I'm noticing, though. If the window has typical narrow muntins and I'm standing a distance from it, the color gradient spans the whole window. But if the window has wide mullions (as is the case with the lights at the top of my entry door, for example, where the mullions are a couple inches across) or if I'm close to the window, so the muntins subtend a relatively larger arc, the color gradient repeats in each pane. Reading left to right I see yellow, blue, yellow, blue, yellow blue, . . .
So some part of the processing in the visual cortex is recognizing the vertical edge defined by the mullion as the end of one visual subfield in some sense and then repeating the left-to-right dominance pattern in the next subfield.
I didn't come here for a medical consult. None of this bothers me as I navigate the world. I just thought it was interesting enough to report, on the off chance that it's something no one has investigated. Dmargulis (talk) 17:56, 28 March 2017 (UTC)Reply
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)Reply
I disagree with the statement "visual information relayed to V1". Rather it should be "visual information relayed beyond V1". --Ancheta Wis (talk | contribs) 02:10, 10 July 2020 (UTC) This reference shows the retinotopy in V1: https://www.cns.nyu.edu/~david/courses/perception/lecturenotes/V1/lgn-V1.html "As you can see, V1 maintains a retinotopic map."—David Heeger. Thus the edge detection attributed in the article within V1 occurs as output from V1 (meaning that one of V1's functions would be to detect edges, as an output of V1, not necessarily that the input to V1 is the neural edge signal itself). Rather the retinotopic map would contain the information to detect edges (pattern recognition). --Ancheta Wis (talk | contribs) 07:19, 10 July 2020 (UTC)Reply
There are some sections added between 2005 and 2007 which need citations. --Ancheta Wis (talk | contribs) 15:01, 10 July 2020 (UTC)Reply
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)Reply
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)Reply
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)Reply
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)Reply