By Stephen Cunnane, Kathlyn Stewart
The evolution of the human mind and cognitive skill is among the principal topics of physical/biological anthropology. This booklet discusses the emergence of human cognition at a conceptual point, describing it as a technique of lengthy adaptive stasis interrupted by means of brief classes of cognitive strengthen. those advances weren't linear and directed, yet have been bought not directly as a part of altering human behaviors, in different phrases during the technique of exaptation (acquisition of a functionality for which it used to be now not initially selected). in keeping with experiences of the modem human mind, sure must haves have been wanted for the advance of the early mind and linked cognitive advances. This e-book files the strength and nutrient constraints of the trendy mind, highlighting the numerous position of long-chain polyunsaturated fatty acids (LC-PUFA) in mind improvement and upkeep. Crawford offers extra emphasis for the function of crucial fatty acids, particularly DHA, in mind improvement, through discussing the evolution of the attention and neural systems.This is a perfect publication for Graduate scholars, submit doctors, examine scientists in Physical/Biological Anthropology, Human Biology, Archaeology, meals, Cognitive technology, Neurosciences. it's also a very good choice for a grad pupil dialogue seminar.
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Additional info for Human Brain Evolution: The Influence of Freshwater and Marine Food Resources
The Structure of Evolutionary Theory. Cambridge, MA: Belknap/Harvard University Press. J. and Vrba, E. 1982. Exaptation – A missing term in the science of form. Paleobiology 8:4–15. Gibbons, A. 2006. The First Human: The Race to Discover Our Earliest Ancestors. New York: Doubleday. V. 1981. Testis weight, body weight and breeding system in primates. Nature 293:55–57. , and Jacobs, Z. 2004. Middle Stone Age shell beads from South Africa. Science 304:404. G. 2003. Emergence of modern human behavior: Middle Stone Age engravings from South Africa.
There is a paucity of DHA in the land food chain that also contains competing saturated fatty acids and ω6 PUFA (Hibbeln, 2007). The brain ﬁrst evolved using the marine food web some 500–600 million years ago. Since then, DHA has been conserved as the principle lipid-molecular component of visual and neural signaling membranes in the cephalopods, ﬁsh, amphibian, reptiles, birds, mammals, and humans. This is an example of extreme conservation. The preservation of DHA in neural signaling systems which occurred despite the genomic changes over 600 million years implies that DHA could actually have been dictating to the DNA rather than the more conventional view of evolution occurring the other way round.
It seems likely that extensive speciation was not only a product of the rise in the oxygen tension but was also due to the cell structural complexity in which the lipids would have played an important role in generating intracellular specialization and then speciation. CHAPTER 2 LONG-CHAIN POLYUNSATURATED FATTY ACIDS 15 Was Increased Complexity of Lipids Responsible for Cell Structures and Specialization among the Eukaryotes? The state of cellular lipids leading up to the Cambrian explosion can only be a topic of conjecture.