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Evolving Brains Paperback – March 27, 2000
| Price | New from | Used from |
- Print length240 pages
- LanguageEnglish
- PublisherW. H. Freeman
- Publication dateMarch 27, 2000
- Dimensions8.5 x 0.52 x 9.24 inches
- ISBN-10071676038X
- ISBN-13978-0716760382
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- Publisher : W. H. Freeman; New Ed edition (March 27, 2000)
- Language : English
- Paperback : 240 pages
- ISBN-10 : 071676038X
- ISBN-13 : 978-0716760382
- Item Weight : 1.24 pounds
- Dimensions : 8.5 x 0.52 x 9.24 inches
- Best Sellers Rank: #2,260,170 in Books (See Top 100 in Books)
- #1,968 in Neuroscience (Books)
- #2,708 in Anatomy (Books)
- #7,191 in Evolution (Books)
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The level of writing is about that of a review paper. Although Allman covers a lot of subjects, from genetics, developmental biology, palaeontology to primate vision, all concepts are well explained and illustrated and the book makes good reading for a research biologist as well as for an interested layman.
Allman started his career as an anthropologist, which gives him a different perspective than the average neuroscientist's. He not only describes the workings of the nervous systems and behaviors of different animals, but puts them into perspective with their evolutionary roots and their ecological niche. All these insights are not hand-waving speculation, but well supported by comparative studies.
Another strong point of this book is how Allman guides the reader trough the evolutionary lineage leading from amphibians to reptiles, mammal like reptiles, mammals, primates to ourselves. At every branch point he points out the critical innovations, the evolutionary pressures that most likely lead to these innovations and the trade offs made. A key question he addresses is, "why isn't every animal equipped with a big brain?". It is our own experience, both phylogenetically as well as everyday life, that a big brain, and the resulting high level of intelligence, is an advantage. Allman points out the high cost of rearing big-brained young and of maintaining such an energetically expensive organ.
If you are interested in how animals use their brains to deal with ever-changing environments and why our brain evolved to be so much more powerful than any other species', then this book is for you.
Next, there is a more detailed explanation of the different parts of the brain and nervous system as well as the senses of sight and smell. After that, we learn about brains in warm-blooded creatures and primates. And we get into the question of senescene (the risk of dying going up with advanced age rather than staying the same) and what brains have to do with that. As well as more about sight, and how our brains allow us to be so aware of patterns and motion.
There are all sorts of fascinating tidbits to be found. When babies cry out for their mothers, do they do so in a high-pitched voice? Well, in some mammals, they do so at such high frequencies that while their mothers can hear them (and find them), predators find these sounds to be ultrasonic, and thus do not notice. There is also a complex attempt to explain why primates tend to have specific alarm cries for aerial versus ground predators. I find this phenomenon totally unsurprising: sentries make an entire group safer, and since all group members are potential sentries, everyone benefits including the sentries. It's easy to imagine how such cries might have evolved, even though the individuals crying out might well call attention to themselves.
We humans have very large ratios of brain weight to body weight. And perhaps the most interesting part of the book deals with the evolutionary tradeoffs involved with bigger brains. By the way, the part of the body that is most sacrificed in humans to get the excess brain weight is the gut. The liver is also a little smaller than for a smaller-brained mammal.
At the end of the book, we get into the interesting question of why Women live longer than Men. Women definitely do tend to live longer, and often have the unhappy experiences of outliving not only their husbands, but even one or more sons. But why? There are, of course, some flippant answers (not discussed in this book, of course). Men are genetically inhibited from asking for directions, and as a result get lost, wander around, and die. Men are married to Women (actually, I think married men tend to outlive unmarried ones). Men tend not to wear panty hose, a marvelous invention that protects the legs against swelling and blood clots. More seriously, I thought a dominant reason might be the fact that Men generally weigh more than Women. Within a species, smaller mammals may tend to live longer. But Allman makes the point that in those mammalian species where males have major role in parenting (such as the owl monkey), the males live longer. And there's an evolutionary reason for this: a species does better if the caretakers of the young live longer. The author discusses a couple of mechanisms for this: Males take more risks, while in females, estrogen enhances the actions of serotonin, reducing risk-taking behavior. Another mechanism could be that females may tend to lose fewer hippocampal neurons, which "are richly supplied with receptors for the corticosteroid hormones, which are produced by the adrenal cortex to mobilize the body's defenses when subjected to stress." If that's true, it could explain the higher incidence of death in Men due to stress-related causes.
I enjoyed this book very much. I learned plenty from it, and I highly recommend it.


