This is not the only disease that we acquired by becoming human. The list goes on and on. Does the sialic acid mutation play a role in all those uniquely human diseases? But what we do know is that sialic acid, carpeting the cell surface, is critical to interactions between cells. And such interactions are critical to the immune response, to communication between neurons, to hormones binding to their target cells, etc, etc.
It would not be surprising to find this molecule in the center of physiological and pathological processes that are, well, uniquely human. So there you have it. One tiny difference in a single molecule, and what momentous consequences it has wrought.
Humans have always thought of themselves as exceptional and unique. However, some of our early ideas about our uniqueness have been debunked. We are not the only animals that are intelligent and we are not the only animals that can communicate with each other. That being said, some amazing science has demonstrated that there are some intriguing ways in which our behavior and even our biochemistry have truly rendered us one-of-a-kind. Originally published on July 22, , this story has been reviewed and updated by the author for republication on October 4, Dov Michaeli, M.
In addition to his clinical and research responsibilities, he also taught biochemistry to first-year medical students for many years. During this time he was also the Editor of Lange Medical Publications, a company that developed and produced medical texts that were widely used by health professionals around the world. He loves to write about the brain and human behavior as well as translate knowledge and complicated basic science concepts into entertainment for the rest of us.
He eventually left academia to enter the world of biotech. He also founded and served as the CEO of Madah Medica, an early-stage biotech company that developed products to improve post-surgical pain control. Now that he is retired, he enjoys working out for two hours every day.
He also follows the stock market, travels the world, and, of course, writes for TDWI. Fascinating stuff, truly. Your email address will not be published.
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Four month old Bonobo holding a human hand. Photo source: iStock. If we accept the notion that we are only animals that plan for the future, then it begs the question: What is the underlying genetic and neuronal basis for such a breathtaking jump from an animal living in the present to one that is worried about the future and is planning for it? Human-specific cells In addition to all kinds of variations in the molecular and cellular features between humans and chimpanzees, there was one finding that takes your breath away.
Some unanswered questions There are still some important unanswered questions: Exactly which cells in the striatum do those dopamine interneurons communicate with? What functions do these cells perform? Humans and animals both eat, sleep, think, and communicate. We are also similar in a lot of the ways our bodies work. But we also have a lot of differences. Are there any differences that set humans apart, uniquely, from all other animals?
Some people think that the main differences between humans other animal species is our ability of complex reasoning, our use of complex language, our ability to solve difficult problems, and introspection this means describing your own thoughts and feelings. Others also feel that the ability for creativity or the feeling of joy or sorrow is uniquely human.
Humans have a highly developed brain that allows us to do many of these things. But are these things uniquely human? A baboon is being given a mirror test. Image by Moshe Blank via Wikimedia Commons. There are a lot of things that humans think are true about animals and animal behavior, but some of these ideas are problematic.
Sometimes, when we do tests on animal behavior, we use tests that apply to animals like humans, and we expect animals to perform in a similar way if they have similar abilities. For example, the mirror test is used to see if animals have awareness of themselves as the image that they see in a mirror. If a mark is placed on the animal, they should show signs of knowing that the mark is on their body. But what if an animal doesn't have the best vision? Permalink Gallery In the Name of Europe.
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Permalink Gallery Universal health coverage case studies published. Permalink Gallery Providing aid and foreseeing harm. As with the myriad examples of sexual behaviour between members of the same sex, it demonstrates that homosexuality — once, and in many places to this day, decried as a crime against nature — is widespread.
Because sex and gender politics are so prominent in our lives, some look to evolution for answers to hard questions about the dynamics between men and women, and the social structures that cause us so much ire.
Evolutionary psychologists strain to explain our behaviour today by speculating that it relates to an adaptation to Pleistocene life. Briefly, issues with that idea are pretty straightforward: most fruit is not red; most skin tones are not white; and crucially, the test for evolutionary success is increased reproductive success.
No, we do not. Peterson is also well known for using the existence of patriarchal dominance hierarchies in a non-specific lobster species as supporting evidence for the natural existence of male hierarchies in humans. Why out of all creation choose the lobster?
Sexual selection is one of the driving forces of natural selection in most animals. In general, males compete with each other, and females subsequently have choice over which males they mate with. There are physical and behavioural differences between men and women in relation to sex, but our cultural evolution has loosened the shackles of natural selection to the extent that we cannot satisfactorily match our behaviour with other beasts, and claims that we can are often poor science.
Peterson believes that the system that is used by lobsters is why social hierarchies exist in humans. The problem with the assertion is this: serotonin is indeed a major part of the neural transmitter network in humans, but the effect of serotonin in relation to aggression is the opposite. Lower levels increase aggression, because it restricts communication between the frontal cortex and amygdala.
Or brains for that matter. Most serotonin in humans is produced to aid digestion. And lobsters also urinate out of their faces.
Trying to establish evolutionary precedents that justify or explain away our own behaviour is scientific folly. If you wanted to make a different but equally specious political argument with a waft of science about how to arrange our society, you could compare us to killer whales.
They live in a matriarchal social group, in some cases led by post-menopausal females. Or hyenas, the animal with the greatest jaw strength of any, which are also matriarchal, and engage in clitoral licking, to bond socially and to establish hierarchy.
Or the insect order hymenoptera, which includes ants, bees and wasps, and are roughly the same evolutionary distance from us as lobsters. Their social hierarchy involves a single queen and males, whose role is twofold: protecting the colony, and providing sperm on demand — they are literally sex slaves.
Or the freshwater small invertebrates called bdelloid rotifers: millions of years ago they abandoned males altogether, and seem to be doing just fine.
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