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Posts Tagged ‘Sarah Constantin

“Homo sapiens, the only creature endowed with reason, is also the only creature to pin its existence on things unreasonable”*…

We appeared 800,000-300,000 years ago, or in the last 1.5%-5.3% of hominid history

How, Sarah Constantin asks, did we humans get so smart?

If you zoom way out and look at the history of life on Earth, humans evolved incredibly recently. The Hominidae — the family that includes orangutans, chimpanzees, bonobos, gorillas, and humans — only arose 20 million years ago, in the most recent 0.5% of evolutionary history.

Within the Hominidae, in turn, Homo sapiens is a very recent development [see image at top]. We appeared 800,000-300,000 years ago, or in the last 1.5%-5.3% of hominid history.

If you look at early hominid “technological” milestones like tool use or cooking, though, they’re a lot more spread out over time. That’s interesting.

There’s nothing to suggest that a single physical change in brains should have given us both tool use and fire, for instance; if that were the case, you’d expect to see them show up at the same time.

Purposeful problem-solving behaviors like tool use and cooking are not unique to hominids; some other mammals and birds use tools, and lots of vertebrates (including birds and fish) can learn to solve puzzles to get a food reward. The general class of “problem-solving behavior” that we see, to one degree or another, in many vertebrates, doesn’t seem to have arisen surprisingly fast compared to the existence of animals in general.

However, to the extent that Homo sapiens has unique cognitive abilities, those did show up surprisingly recently, and it makes sense to privilege the hypothesis that they have a common physical cause.

So what are these special human-unique cognitive abilities?…

Is Human Intelligence Simple? Part 1: Evolution and Archaeology,” from @s_r_constantin. Part 2 is here.

* Henri Bergson


As we study our species, we might send self-examining birthday greetings to Giambattista Vico; he was born on this date in 1668.  A political philosopher, rhetorician, historian, and jurist, Vico was one of the greatest Enlightenment thinkers.  Best known for the Scienza Nuova (1725, often published in English as New Science), he famously criticized the expansion and development of modern rationalism and was an apologist for classical antiquity.

He was an important precursor of systemic and complexity thinking (as opposed to Cartesian analysis and other kinds of reductionism); and he can be credited with the first exposition of the fundamental aspects of social science (and so, is considered by many to be the first forerunner of cultural anthropology and ethnography), though his views did not necessarily influence the first social scientists.  Vico is often claimed to have fathered modern philosophy of history (although the term is not found in his text; Vico speaks of a “history of philosophy narrated philosophically’).  While he was not strictly speaking a historicist, interest in him has been driven by historicists (like Isaiah Berlin).


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