PSY362H5 Lecture Notes - Lecture 2: Chromatophore, Collagen, Ion Channel

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26 Sep 2017
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Lecture 2
How the Eye Sees in Colour
Rods and cones
Why Bananas Appear Yellow
Only reflects yellow
Occurs within 570-580 nm range
What Colors do you see?
Pigeons are tetra chromates
Humans cannot see within the UV range
Pit Vipers can see within orange and red, as well as in the infra-red range
Not all creatures see things the same way we do
For birds, being able to detect various wavelengths is an important aspect of mating
o It helps them to stay prepared
o Various berries reflect certain color
Blue/black or white/gold dress?
It all depeds o the idiiduals pereptio
Various individuals see the dress as blue black, while others see it as white/gold
Testing the visual recognition of dogs for other dogs
Dogs were presented with non-dog faces and dog faces
Non dog faces included humans, sheep, etc
It took 2-10 trials for the dog to be able to select the image of the dog face
How Perception plays a role in physical characteristics
Adaptive Camouflaging: Cuttlefish changes its physical appearance (via camouflage) to
blend in with their environment and prevent themselves from being preyed on
Scientists were interested in seeing if the cuttlefish was capable of camouflaging into
complex patterns
o Complex patterns include: checkered patterns, stripes
In the complex pattern experiment, it was demonstrated that the cuttlefish camouflages
ith hats udereath it, ot hat is i frot of it
The Octopus can see with its skin
Octopi have light reflective cells called chromatophores
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Document Summary

Why bananas appear yellow: only reflects yellow, occurs within 570-580 nm range. It helps them to stay prepared: various berries reflect certain color. It all depe(cid:374)ds o(cid:374) the i(cid:374)di(cid:448)idual(cid:859)s per(cid:272)eptio(cid:374: various individuals see the dress as blue black, while others see it as white/gold. Testing the visual recognition of dogs for other dogs: dogs were presented with non-dog faces and dog faces, non dog faces included humans, sheep, etc. It took 2-10 trials for the dog to be able to select the image of the dog face. In the complex pattern experiment, it was demonstrated that the cuttlefish camouflages (cid:449)ith (cid:449)hat(cid:859)s u(cid:374)der(cid:374)eath it, (cid:374)ot (cid:449)hat is i(cid:374) fro(cid:374)t of it. It (cid:449)as fou(cid:374)d that the o(cid:272)topi do(cid:374)(cid:859)t (cid:374)e(cid:272)essaril(cid:455) use its (cid:271)rai(cid:374) to s(cid:374)eak o(cid:374) pre(cid:455) or get a(cid:449)a(cid:455) from predators. It uses the skin cells: this can be seen as an evolutionary advantage. In a similar experiment, there was three different moths presented: moth 3 was the most cryptic.

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