- #71
apeiron
Gold Member
- 2,138
- 2
ConradDJ said:I find this statement odd... I would think that the origin of life is usually framed as the accidental emergence of some sort of system that could split into duplicate copies of itself. Metabolism and codes would have developed later, no? At least that seems like the “usual” view.
By code, I mean the RNA or whatever other self-replicating molecule first kicked it off.
And which came first, is a fundamental division among theorists. Eg..
The conceptual gulf that separates the `metabolism first' and `replication first' mechanisms forthe emergence of life continues to cloud the origin of life debate. In thepresent paper we analyze this aspect of the origin of life problem and offerarguments in favor of the `replication first' school.
http://www.springerlink.com/content/q7640p84j30836k5/
There is the same chicken and egg question in language evolution - if you need both semantics and syntax to have a language, one must have arisen first, but then both also plainly need the other to make sense. You were either a semantics-first, or syntax-first, theorist, and neither stance was ever satisfactory.
ConradDJ said:But in the case of humans, this business of teaching and communicating somehow caught fire and began to take over virtually all of our existence, to the point where our survival entirely depends on it.
This doesn't really seem an issue to me as memesis is so common in social animals. As you say, the transmission of culture is commonly seen in animals. And there are things like "mirror neurons" to show that brains are evolved to anticipate/follow the actions of others.
The paleo record also shows homo were skilled tool users and fire makers and co-operative hunters long before the modern sociocultural speech transformation. We existed in a pre-symbolic communicative stage for at least 600,000 years and have been fully symbolic only for about 120,000 years.
The transformation looks tied to the evolution of vocal articulation - arched palate, dropped larynx. And so as I say, a constraint on vocalisation that made it suddenly syballic - probably as a "singing" refinement. Then almost immediately there was a swift transition to a semantics~syntax division that underlies symbolic speech. The hardware was suddenly found to be there that could support an entirely new level of software that had never existed before.
ConradDJ said:I know that you feel “development” has been shown to be more basic than “evolution”, and that leads you to focus on the development of symbolic, linearly coded speech. Which was surely important. But the development of the genetic code in biology must clearly have happened in the context of evolutionary selection established by self-replicating entities of some kind. And my guess is that the emergence of coded speech happened in the context of an evolutionary process that was already strongly selecting for a kind of emotional bond that reproduced itself through the need to communicate.
If devolopment is dichotomous with evolution, then I would have to in fact see both as equally basic. And indeed that is the modern theoretical biology position - why everyone talks about evo/devo these days. So if I emphasise development, that is mainly because that is the forgotten half of the complementary pair. Darwinian evolution seems so easy to understand that people like to treat it as the "everything". Developmental biology always strikes people as more mysterous.
I agree that speech evolved out of a host of pre-adaptations and existing behaviours - hominids were already tool-using, large brain, lateralised, highly social animals. So everything was there for a long time. Which is why the story of dimensional reduction is a powerful explanation. The puzzle is symbolic speech did not arise earlier given all the psychological and sociological conditions appeared to be in place. The one last lucky accident had to have been the evolution of a throat and tongue designed for biting a stream of vocalisation into discrete chunks - syllables.