Hi everyone, I start this as a companion topic for my bewilderment over there : [image] Are V1 transforms pre-wired or learned? If it turns out I’m the only one interested in this approach, I’d very much like to know why… but I’m unlikely to let that idea slip without a well-educated “dead end”…

Thanks for sharing this. Very interesting and relevant learning on this topic.

Thanks for the kind feedback everyone. Currently crunching numbers to come up with biologically plausible mappings from retina to LGN, and from LGN to V1. Biology is messy… and no two accounts agree on size, shape, or even function. What’s the problematic, you ask ? Here is the V1 retinotropic map…

Gary, This book is really great. Many thanks.

Some of the visualizations I promised… There are some accounts of different P-to-M ratios depending on eccentricity, so that would contradict my presented scheme above… although I can’t get reliable figures, everyone had a different opinion about that some years ago… now nobody ever cares. At least…

Thanks for bringing that topic up on the hangout. Mark expectations of working code seem high ^^ I hope we can deliver. At any rate, the heavily localized disposition of V1 cells in sensory space has forced us to ponder about topological concerns at length. We’ve been discussing those concerns wit…

Some musing - I have been thinking about how your model will learn edge orientations. Thinking biologically - It occurs to me that at several stages in the formation of each map one organizing principle is the chemical signaling creating “addresses” and gradients in a given map. Sort of a chemical …

Ocular dominance stripes are indeed a matter of axonal wiring (That’s why it is an initialization phase in the model where axons are pre-wired), while formation of edge detection cells is visual input dependent. Evidence of this comes from lesion studies at birth. If one eye is missing, the LGN axon…

[image] gmirey: Hi everyone. This time I also tried some visualizations. First, meet the hex lattice Yes! And Q*Bert - 3D: [image] http://keekerdc.com/2011/03/hexagon-grids-coordinate-systems-and-distance-calculations/

@Gary_Gaulin : as alternativ explaination and software implementation you can see at [image] Red Blob Games: Hexagonal Grids Guide to math, algorithms, and code for hexagonal grids in games

I agree, I should have posted both links. The Red Blob Games website is the one I most needed for my hexagonal math related projects, and ironically I was back again while searching for the Q*Bert link. It seemed best for me to not provide an overwhelming amount of information. But I could have add…

Project : Full-layer V1 using HTM insights

Engineering

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Are V1 transforms pre-wired or learned? General Neuroscience	14	2092	April 19, 2018
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Project : Full-layer V1 using HTM insights

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