Tag: selection

ASPM, Microcephalin and Tone

ResearchBlogging.orgDisclaimer: I know this post is on a paper released over a year ago; however, I’m still going to write about it for three reasons: 1) I did a presentation about it earlier this week (20/01/08); 2) I think it relates to a recent buzz around gene-culture co-evolution; and, 3) It’s a bloody awesome paper.

So, what is the paper called? Okay, once you read this title, do not yawn, go to another website or… Linguistic tone is related to the population frequency of the adaptive haplogroups of the two brain size genes, ASPM and Mircocephalin. See, now we’ve got the hard part out of the way, I can begin to discuss exactly what the authors, Dan Dediu and Robert ‘Bob’ Ladd, found and why it’s important to our understanding of linguistics, genetics and evolution. It’s really interesting, honestly.
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Swarm Intelligence

I just finished watching this great BBC documentary about swarm intelligence. Ignoring the presenter’s attempt to inspire fear in us mere humans, with ominous suggestions of a great red fire ant invasion, swarm intelligence is basically the notion that swarms of creatures (such as the aforementioned ant) work as a collective consciousness. It makes intuitive sense: more minds = more processing power. Of course, these species have been shaped by natural selection to function in this eusocial manner, although whether or not we’re discussing inclusive fitness, superorganisms or something else remains outside the programme’s scope. In fact, the term swarm intelligence doesn’t seem to be a conventional term amongst biologists; too many anthropomorphic connotations no doubt.

Sadly, it is was only available on the BBC until 21.39 GMT, today! yesterday. So get watching. Instead, I’ll leave you with the first youtube video I could find about swarm intelligence, which is actually nothing to do with animals and more to do with computing, networks and information management:

Schizophrenia and brain evolution (plus bold adjectives)

ResearchBlogging.org When exploring the etiology of schizophrenia, a feat that has mostly eluded understanding for over 100 years, a common denominator emerges in that associated deficiencies are rooted in cognitively demanding tasks. One suggestion is that, where schizophrenic individuals are involved, disorganised thoughts, abnormal speech, auditory hallucinations and paranoid delusions are symptomatic consequences of our haphazardly evolved brains. It might not seem revelatory, nor is it a particularly new thought on the matter, yet this disorder clearly has ties with human-specific, recently evolved behaviours, such as language and social relationships. And it is here in which our problem emerges: we don’t even know how language or social relationships evolved. In fact, the evolution of the human brain is still very much an enigma, despite the whole host of literature having you believe otherwise. As Darwin put it: “Ignorance more frequently begets confidence than does knowledge[…]”.

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