I thought I had already presented the idea of our genetic watersheds in more detail when I did my recent post on Monod, but alas, I had detailed it in another context. I want to correct that omission. The idea here is to visualize how genes flow down through evolution and accumulate to generate new somatic structures that perform old functions better or can then be induced to perform new functions. Monod’s “reservoir of variability” mentioned 2 posts ago here is a watershed landscape littered with random springs of new genetic forms; many springs appear and disappear with little consequence while a few others contribute to the flow down through the ages—these mutations find a friendly fit with the rest of the genome and also contribute to improved adaptability. So here goes, first with a bit of contextual ground and then the figure.
The planet Earth formed some 4.54 billion years ago (bya) to become the ground for Gaia’s seed. The moon was struck off the planet by an asteroid a short time later around 4.53 billion years ago. I read a while back that scientists thought Earth’s water arrived via asteroids and comets 4 billion years ago but more recently I have read that they think most of our water was here early on as a product of the planet’s coalescence. Evidently at least some water from comets is now known to have a different chemical signature than our water here on earth. In any event virtually all the water on earth was present by 4.4 billion years ago. The earliest evidence of life found so far is about 3.7 billion years old and soon Earth metamorphisized into Gaia.
I identify two major features of life that have advanced speciation and increased complexity. Edelman and Tononi use the term ‘value’ to denote evolutionary value; that is, once a structural or functional feature has appeared in evolution and is found to be adaptive, further evolution tends to elaborate upon that value (see post 7/7/16). So these two features, rivers of genetic flow if you will, represent two major evolutionary values. First, any definition of life must include a metabolic process for energy and finding/ingesting nutrients. This is what I call SWP for Solving the World Problem, i.e., exploiting resources for survival in the world outside the integral soma. Over the past 3.5 bya countless chance events have contributed to mutating the genome in ways that improved the soma’s ability to find nutrients, such as improved sensory/perceptual, e.g., eyes and ears, and motoric capabilities, e.g., pseudopodia, fins, tails, legs, arms. Each chance mutation is a spring in the watershed of SWP; some springs appeared and disappeared because they did not contribute to fitness while others contributed genetic changes that have continued flowing down the ages. This flow I call the River Sentience (RS) because that is what sentience is, ambient awareness that facilitates finding nutrients and avoiding being food for other somas. The RS is the primary flow of genes accrued since life’s inception somewhere beyond 3.5 bya.
Now 1.2 bya ago a new sort of spring promulgated a special watershed that also contributes an important value to our evolutionary past and present, and that is the watershed of Conspecific Relations (CR). This incipient spring started sexual reproduction, making necessary the finding and cooperating with a suitable mate. That the flow from this spring became so prominent is due to the effects sexual reproduction has on increasing the mix of genes not through mutation but by combining genes from sperm and egg thereby increasing the variability in the gene pool and opportunities for evolutionary advancement. What is also quite relevant here is that finding mates becomes enabled through signaling, e.g., plumage, song, strength, and, please do not forget, signs of parental aptness. Somewhere around 500 million years ago (yes that would be .7 bya later from the inception of sexual reproduction) a genetic spring arose for the production of oxytocin, the beginning of a hormonal system supporting parenting behaviors. Oh my, but that is important because now evolutionary success is advanced by child rearing, attachment and bonding. Now these springs from sexual reproduction on down to family bonding contribute to a large flow I call the River Empathy (RE) because essentially CR (Conspecific Relations) promotes the emergence of social relations based upon the empathic communication amongst conspecifics.
That is the contextual ground; now we focus on the important figure which began to develop some 315 million years ago and finally became clear with the evolutionary appearance of mammals. I have posted before about what makes these kinfolk of ours so special (see posts on 10/16/16 & 11/2/16 about Mammalian Heritage Day). To bring this post to a conclusion though, consider that with mammals 315 mya, even more so with primates 50 mya, then simians over 8 mya, and finally with Homo say around 500,000 years ago, that the evolutionary genetic flows of the RS from the SWP watershed and the RE from the CR watershed merged, so that Solving World Problems became a social affair and that Conspecific Relations became a world problem to be solved (and I hope we do it soon because otherwise . . . .). This confluence of RS and CR from their respective watersheds created a new river, the River Consciousness (RC) as we became aware of our conspecifics’ efforts to solve world problems, i.e., we became conscious of another’s subjective mind, their intents and plans. Then our evolution progressed, fed by yet other springs to the sharing among minds through enlightened empathy and powerful symbolization, thus the name of my blog.
Each of us is a witness to the eons of flow down from these watersheds. Each of us is also a witness to our own particular life as subjectively experienced. So as I have mentioned before (see posts 7/25/15 & 6/26/15), our individual genome resulting from this genetic flow upon ontogenesis deposits a soma (with its brain and MEMBRAIN) like a river delta where the flow meets the ocean of experience Obviously much more to be said but now is the time to travel on.