"New" colours possible?

C.J.L. Wolf C.J.L.Wolf at ncl.ac.uk
Tue Nov 20 11:43:51 EST 2001


On Mon, 19 Nov 2001, Brian wrote:

> "Vishal Dhokia" <vishal at ddhokia.fsnet.co.uk> skrev i melding
> news:9t9m1k$a8g$1 at news6.svr.pol.co.uk...
> > why would there need to be expansion necessarily - couldnt the same circuits
> > code the new information (with a sacrificial loss in some form of perception
> > though)
> 
> Possibly, but the loss would be substantial.

What form might this substantial loss take, and how do you know it would
be substantial? What does this mean for people with 2 cone types (normal
red-green colourblindness...).

Think back to the neural circuitry required. Somehow the developing
brain's got to sense that there's a whole new type of cone present, and
make different connections to it than it would to other cones. It's pretty
straightforward to think up scenarios whereby a new cone type with a
different pigment arises from spontaneous mutations, but this is only a
small fraction of the story.

KW




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