Monthly Archives: April 2014

Ipnops

Ipnops murrayi

Ipnops murrayi

According to the literature Ipnops is the only vertebrate in which both the eyes and the optic nerves are completely missing. The present investigation has however shown, beyond doubt, that the peculiar organs on the head of Ipnops, which are generally held to be phosphorescent organs, are in reality modified eyes.–O. Munk. “The Eyes of Ipnops Murrayi”

Vision is important to nearly all animals, so much so that only animals who live in caves with no source of light are completely blind. Even bats, who rely primarily on echolocation for orienting themselves and finding prey, have some vision.

In the deepest depths of the ocean, where no light can penetrate, fish use a biological flashlight. Called bioluminescence, this cool light, usually in the blue-green spectrum, is manufactured by marine bacteria and resides in the gut of the fish. It is believed that the fish have some control over this light, which is used to hunt, lure prey, attract a mate, or aid in coordination of the school.

One of the strange fishes at the bottom of the sea is the ipnops. Like most bottom dwelling fish the ipnops’s eyes are on the top of its head, not on the sides, and these are round tubular eyes poking out of a flat head with transparent bones. Quoting from Wikipedia “The purpose of these structures is debated — they are light-sensitive and may serve to detect bioluminescent prey; it has also been proposed that the organs themselves may be luminescent and act as lures.” The ipnops lives in the very darkest regions of the sea, from the bathypelagic to the abyssopelagic or abyssal zone. Truly these animals reside in the abyss.

I have not had the occasion to use ipnops magically, but I think they may have some interesting, if specialized, applications. For one thing, “ipnops” sounds like a magical word. This would be a good animal to call on energetically when you find yourself “in so deep” that you cannot “see your way.”
Ipnops agassizii. Photo R.B. Reyes.

Ipnops agassizii. Photo R.B. Reyes.




Sources

Munk, O. “The Eyes of Ipnops Murrayi.” Copenhagen: Institute for Comparative Anatomy and Zoological Technique, 1878.

Sinclair, Sandra. How Animals See: Other Visions of Our World. New York: Facts on File, 1985.

Wikipedia, Ipnops.

http://media.eol.org/content/2009/05/19/16/68617_orig.jpg (Photo R. B. Reyes) Ipnops Agassizii

http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Ipnops.JPG/640px-Ipnops.JPG Ipnops Murrayi

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Human and Animal Vision


It turns out that humans are highly anthropocentric in how we conceive of vision. The measures that we use tend to be areas where problems in human vision arise: focusing at distant and close range, seeing at night, depth perception, field of vision, and colorblindness. We don’t factor in things that most humans can do easily, such as recognize patterns, and we also don’t think about things we can’t do at all, such as recognize the source of diffuse light.

Here is a list of factors that vision entails (which may not be complete):


Ability to detect light (this is the core function of vision)

Ability to locate the source of diffuse light (polarization)

Ability to see in low light

Ability to see in bright light

Sensitivity to changes in contrast

Ability to see colors

Range of color vision

Ability to distinguish hues within a narrow band of color

Depth perception

Detection of movement

Ability to see stationary objects

Field of vision (including ability to see up and down as well as on a 360 degree plane)

Focusing ability (including speed of focus on near and far objects)

Ability to detect images at great distances

Clarity of vision at far and close range (accommodation)

Ability to detect shapes, both solid and outline

Ability to recognize patterns

Rapidity of image formation (analogous to frames per second in a camera)

Clarity of underwater vision

Ability to detect images below the surface of the water from above (and vice versa)

Ability to compensate for idiosyncrasies in refraction (closely related to the factor above)

Ability to compensate for movement (self locomotion as well as movement in the environment)

Formation of a single image versus split vision

Capacity for visual organs to withstand environmental challenges such as cold, pressure, and debris


I have not been able to find information comparing abilities to see and interpret auras.

So which animal has the best vision? I was a few chapters into this book before I realized what a silly question this is. Each animal has a type of vision perfectly adapted to its environmental niche. No eye or set of eyes can function in all areas extraordinarily well, because there are a few areas that are mutually exclusive and so it’s a choice between specialization or compromise. If I did have to pick the animal with the best vision, however, it would be any member of the ape family, including humans. No doubt many will not believe me and will dismiss this as more anthropocentricism. I say this because while there are animals who outperform us in every area of vision, except perhaps pattern recognition, our eyes function competently in a wide range of environments and circumstances. Our eyes do little that is spectacular but almost everything well. This is probably the main reason we have adapted to so many environments around the globe.


Source

Sinclair, Sandra. How Animals See: Other Visions of Our World. New York: Facts on File, 1985.

Photo credits: Eagle–Vtornet; Chimpanzee–Thomas Lersch

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How Animals See


Most of us intuitively understand that other animals do not see the world the way we humans do, and we like to imagine how things look from their point of view. It turns out that the ways of seeing are more intricate and varied than we realize.

I am returning this week to a favorite topic of mine: vision. Over the next several weeks I will be sharing insights gleaned from my perusal of an out-of-print book, How Animals See: Other Visions of Our World, by Sandra Sinclair. This book examines eyesight in a wide range of creatures, from insects to mammals, sea dwellers to migrating birds.

I did not realize when I picked up this book how unique it is, really one-of-a-kind. Since it was published in 1985 the other books on the subject have been children’s books, which is par for the course. Books on the really interesting topics seem to be written for kids, not grownups. Lack of interest may not be the primary factor here, however. The subject matter is difficult, so much so that biologists and others who study in this area use words and concepts that most people have only a fuzzy understanding of. Sinclair spent years researching her material under the mentorship of Dr. Dean Yeager of The State University of New York College of Optometry, and Dr. Yaeger writes in his foreword that even he was forced to read outside his areas of expertise in order to assist with the project. This seems to be the kind of book that only a very bright journalist with generous assistance from experts could make comprehensible to the lay reader. Even so, I do not think I would have been able to understand this material had I not already read some basic books about human eyesight such as Relearning to See by Thomas Quackenbush, which I wrote about last year.

I have tried unsuccessfully to find a more up to date version of Sinclair’s work. I have found only two books that are close: a 2012 book called How Animals See the World: Comparative Behavior, Biology, and Evolution of Vision by Olga F. Lazareva et al and Animal Eyes by Michael F. Land and Dan-Eric Nilsson. The blurb at Goodreads boasts that How Animals See the World “…contains 26 chapters written by world-leading experts” and calls it “An exhaustive work in range and depth, … a valuable resource for advanced students and researchers in areas of cognitive psychology, perception and cognitive neuroscience, as well as researchers in the visual sciences.” Animal Eyes is billed by the publisher as “…a comparative account of all known types of eye in the animal kingdom, outlining their structure and function with an emphasis on the nature of the optical systems and the physical principles involved in image formation.” Both rather dense sounding texts assume a solid knowledge base in the visual sciences, which makes me appreciate Sinclair’s work all the more. I have to say, however, that I found even this book a stretch.

Over the next few months, look forward to juicy bits of trivia about some very weird ways of seeing.


Source

Sinclair, Sandra. How Anmals See: Other Visions of Our World. New York: Facts on File, 1985.

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Tasting Life to Its Fullest: My Love Affair with Mesopotamian Culture

Photo Michel Wal

Photo Michel Wal



This post concludes our in-depth exploration of Mesopotamian cuisine, inspired by Jean Bottero’s wonderful book, The Oldest Cuisine in the World: Cooking in Mesopotamia. Bottero states in his conclusion

In writing this book I did not intend to provide an exhaustive, scholarly study of eating and drinking among our venerable ancestors from ancient Mesopotamia. Such a work would have been tedious and dry, addressed (at the expense of honest readers) only to academics, who scarcely need it and may not want it.

I am not an academic or a scholar, so I appreciate that attention was paid to making the study of Mesopotamian cuisine interesting. I have, however, read a fair amount about the Sumerians and Akkadians, more than the average Pagan, so I also have some general context in which to place this cornucopia of information about food. One thing that jelled for me in exploring this book, which had only vaguely registered before, was an appreciation for the enthusiasm with which the ancient Mesopotamians approached the business of life. This can be glimpsed in their descriptions of their games, in the homage paid in word and picture to lovemaking, and in the exuberance with which the hero Gilgamesh throws himself into adventure, friendship, and even sorrow. Yet it was only in studying the art and excess of their food and drink that I came to recognize the Mesopotamian commitment to enjoying life. This was not merely the hedonism of “eat, drink, and be merry,” although sensuality certainly played a part. Mesopotamians worked as hard as they played, and they took significant pride in their accomplishments. They also loved hard: they loved their cities, their craftsmanship, their civilization, and the gods who rewarded them so generously for their labors. Their joie de vivre was not tempered by cynicism, as it so often is today, although they had a fine appreciation for ironic humor. If in the ancient world the Egyptians strove to be memorable, the Israelites to be good, the Greeks to be wise, the Romans to be victorious, the Celts to be honorable, and the Germans to be brave, the Mesopotamians strove to extract the most satisfying enjoyment possible out of life.

In closing let’s turn once again to the words of the tavern keeper, sometimes identified as the goddess Ninkasi, to Gilgamesh

Humans are born, they live, then they die,
this is the order that the gods have decreed.
But until the end comes, enjoy your life,
spend it in happiness, not despair.
Savor your food, make each of your days
a delight, bathe and anoint yourself,
wear bright clothes that are sparkling clean,
let music and dancing fill your house,
love the child who holds you by the hand,
and give your wife pleasure in your embrace.
That is the best way for a man to live.


Sources

Bottero, Jean. The Oldest Cuisine in the World: Cooking in Mesopotamia. Translated by Teresa Lavender Fagan. Chicago: University of Chicago Press, 2004.

Mitchell, Stephen. Gilgamesh: A New English Version. New York: Free Press, 2004.

Feeding the sacred herd. Photo Louvre Oriental Antiquities Collection.

Feeding the sacred herd. Photo Louvre Oriental Antiquities Collection.

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