The Null Device

Posts matching tags 'natural selection'


Two scientists speculate on a genetic cause for why America is full of loud, energetic go-getters. Their hypothesis is that "American hypomania" results from the American gene pool containing many genes from immigrants, a group which, by its nature, would self-select for genes encouraging curiosity, risk-taking, neophilia and boldness:

Peter C. Whybrow of U.C.L.A. and John D. Gartner of Johns Hopkins University Medical School make their cases for an immigrant-specific genotype in their respective books, "American Mania" and "The Hypomanic Edge." Even when times are hard, Whybrow points out, most people don't leave their homelands. The 2 percent or so who do are a self-selecting group. What distinguishes them, he suggests, might be the genetic makeup of their dopamine-receptor system - the pathway in the brain that figures centrally in boldness and novelty seeking.
Why aren't Canada and Australia, where many immigrants and their descendants also live, as hypomanic as the United States? Whybrow answers that behavior is always a function of genetics and environment - nature with an overlay of nurture. "Here you have the genes and the completely unrestricted marketplace," he says - with the anything-goes rules of American capitalism also reflecting immigrant genetics. "That's what gives us our peculiar edge."
Of course, the fact that a lot of the descendents of Australians did not choose to emigrate could also have something to do with it.

By coincidence, I was thinking about American hypomania recently, in the context of American culture having a propensity for maximality in various areas (the biggest cars, the fastest roller-coasters, the most exciting movies, the loudest, most attention-grabbingly garish TV); it came up in the context of the ongoing popularity of the death penalty in America, and the recent execution of Stanley "Tookie" Williams. Other than the ancient imperative for vengeance ("an eye for an eye and a tooth for a tooth", as it says in the Hammurabi codex the Bible), it is arguable that humanely euthanasing a convicted criminal is not a greater punishment than leaving them to contemplate their wrongdoing for some decades from within a cell with no hope of release. However, from an observer's point of view, the ritual of executing an evildoer is a grander statement of symbolic redressing of wrongs than the boringly administrative option of merely locking them up.

(via mindhacks) capital punishment culture evolutionary psychology genetics natural selection neophilia society usa 0


When memes compete for mindshare in the ideosphere, one of the things they're selected for is emotional impact. The most sensational story wins, as does the most disgusting urban legend, according to this paper. (via FmH)

(Which all makes sense; by the same token, there are other (so far anecdotal) laws of memetics. For example, it has been observed that urban legends that mention a "brand" of some category mutate to refer to the best-known brand. (For example, the one about some small fried-chicken restaurant chain supporting the Ku Klux Klan mutated into an urban legend about KFC, and it's probable that the "Albert Einstein said we only use 10% of our brains" UL started as a claim about some lesser known very smart person making that statement.) I'd speculate that this is the result of a selection for economy or consistency with one's existing knowledge/memes, or a streamlining process that erodes memes into more agile forms.)

disgust emotions evolution memetics natural selection psychology replicators urban legends 2


Our Furry Masters: A psychology researcher at Cornell University has found that domestic cats' meows have evolved to hook into human perception, and better communicate with (or manipulate) humans, over the millennia of domestication. Recordings of the calls of wild desert cats (believed to be closely related to domestic cats' wild ancestors) were found by test subjects to be harsher and less pleasant-sounding than those of domestic cats.

"I think cats have evolved to become better at managing and manipulating people."

(via Techdirt)

cats evolution manipulation natural selection symbiosis 4

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