How the retina works

Mike Tyner mtyner at mindspring.com
Wed Jul 21 21:49:03 EST 2004


"MZ" <zarellam at twcnyremove.rr.comspam> wrote

> > cause the shadows to move, the vessels become dramatically visible - a
> > phenomenon called Purkinje's tree.
>
> I was under the impression that the brain compensated for the vascular
> shadows on the retina.  Hence the "representation", so to speak, of the
> vessels in cortex (eg. Horton's recent "angioscotoma" papers).

Fascinating stuff (http://www.tsolab.org/jclub/20021104/ADAMS_~1.PDF).
Thanks for pointing it out.

Horton isn't much help on how the brain compensates, simply that the shadows
are "filled in perceptually, like the blind spot."

It was also curious that he said the patterns couldn't be found in visual
cortex of macaque or human.

The regression of fibers in a recognizable pattern parallels my
understanding of amblyopia,  and an amblyopic process probably helps the
vessels remain invisible. But Purkinje's tree results from shadow edges
encroaching on functioning retina. When new vessels form, long after the
neuroplastic period, they're still imperceptible except in Purkinje's tree.

Re lateral inhibition the dramatic "floating dots" illusion was attributed
to LI, iirc. If the image won't attach here, it's called "count the dots" at
http://www.optillusions.com/dp/1-1.htm

-MT


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end




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