A Body Beneath Collecting Issues of the Comic Book Series Lose

Michael Deforge

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Sprache: Englisch

Verlag: Koyama Press, 2014

1927668077 / 9781927668078

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There are several sources of serious confusion in the investigations of how bees and humans see grey and black. First, von Frisch trained bees to go to a coloured paper, and then tested whether they could distinguish that colour from a palette of 15 shades of grey placed together on a test board. Unfortunately, he used papers made from wood pulp, which do not reflect ultraviolet, so the UV receptors were excluded. Secondly,16 years later it was shown that bees require a 25% difference in brightness to discriminate grey levels, so his test was uncertain. Thirdly, bees are dichromats, and detect only green contrast and the fraction of light that stimulates the blue receptors. The most interesting confusion is that grey photons do not exist, but that does not affect bees because they are functional dichromats and treat grey like any other colour. No problem. The UV receptors in the compound eyes of the bee are used to detect the direction of the sky to stabilize flight and escape upwards when disturbed. The bee is a sexless herbivore, which may account for its relatively simple retina. Additional colour types of receptor have been found by recording from eyes of some flies, butterflies and dragonflies, presumably for unique recognition of the other sex or prey. However, this is one-purpose vision which does not require much processing or large brain. Full colour vision requires at least three colour types of receptors and a large visual cortex, as in primates.Human vision is more difficult to understand in this context. Black is entirely a hallucination because there are no black photons. White is detected normally with three receptor types acting together, but the brightest objects in sight also look white even though they are green or red, maybe as a calibration. The edges of shiny objects also look white although clearly they are not. Grey is hallucinated as various levels of black where there is white but insufficient illumination to see it as white.These topics are discussed in historical context. However, some who work on the vision of the bee still believe that bees have full colour vision, and many believe that their dog or cat sees only black and white, so called achromatic vision. However, like the bee, they all evolved in world where green predominated, and many things of interest were less blue (e.g., yellow) or more blue than green (e.g., blue), so most mammals evolved as dichromats, without UV or red receptors.…

Bestandsnummer des Verkäufers 00109160053

Titel
A Body Beneath Collecting Issues of the Comic Book Series Lose
Autor
Michael Deforge
Verlag
Koyama Press
Erscheinungsjahr
2014
Zustand
Good
Einband
Paperback
Sprache
Englisch
ISBN-10
1927668077
ISBN-13
9781927668078

World of Books (was SecondSale)

Montgomery, IL, USA

Verkäufer/-in mit 5 Sternen

AbeBooks-Verkäufer/-in seit 20. Dezember 2007

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Founded in 2002, World of Books is a leading online destination for buying and selling both preloved and new books, committed to making sustainable reading accessible to all. With a mission to help people read more and waste less, World of Books offers a huge range of affordable, high-quality books — giving both new and preloved titles a second life. The company also operates World of Books – Sell Your Books, an easy-to-use platform that allows customers to trade in unwanted books for cash, helping to keep books in circulation while promoting sustainability. As a Certified B Corp, World of Books is driven by a vision to become the world’s largest and most sustainable dedicated online bookstore. The company measures its success through the positive environmental impact it creates, the value it provides to customers, and its ability to operate profitably while supporting its sustainable mission …

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