DrZoidberg
Contributor
And what you describe does look like a two-system set up anyway.
Seems also fair to assume that what you call the "control system" is basically our conscious mind? Or is that something else?
Because although me can usually choose to consider our many urges to assess them and decide what to do next, I don't think this is the default mode. Rather, it seems we suddenly want to do something rather than something else and that's when we may choose instead to step back and see whether it's a good idea to proceed with that. So, basically, there's a level of control that would be unconscious and another one which is the conscious one. After all, if dogs are not conscious in the way we are, we would still expect their brain to be able to decide what to do next between barking, biting and peeing for example. So, the question is whether we have two levels of control, and thereby truly two systems, only the second one conscious, or just one level of control and therefore just one system. And how do you explain consciousness in this second case?
EB
Not at all. Rather the opposite. The control system are even smaller parts of the machinery. They're highly specialised to only kick in in certain situations. Take for example our innate fear of snakes. This control system does nothing but analyse pictures coming in and look for things that have a complete set of certain markers. The snake control system sits on high priority. So has a lot of power. But only kicks in if it detects a snake. And if it does it can take over completely. Sometimes this cabling gets wrong and this fires at inopportune moments. I'm thinking cats and cucumbers.
Consciousness cannot be the control system. Partly because we've proven experimentally that the consciousness doesn't take decisions. Whatever it is that takes decisions is elsewhere. But also, because it's a dumb model. Nothing in nature works that way. And not just living nature, but nature nature. If our consciousness was truly in control it would be a self causing causal agent. That's physically impossible. Or as Daniel Dennet to aptly put it, it would require an infinite regress of humunculi
I suspect consciousness is part of our story telling machinery. It's used to create compelling and interesting stories. Things that risk revealing our true motives is hidden in our subconscious. The stuff we're conscious about is mostly self agrandising facts that make us seem more impressive to our peers. Anyway... that's Stephen Pinker's theory, and I think it's compelling.
To understand the brain you first have to ask yourself 'why a living thing at all', and then secondly 'why did intelligence evolve', being the the thing that is unique to humans.
In the first part the function of the brain is to propagate itself, and so the most deeply embedded functions of our nervous system are intrinsic to our survival: our neuromotor system allowing us to move around and manipulate the world, automatic systems that keep our heart beating and our lungs pumping. Or like you mention, things like automatic reactions to dangerous animals.
What distinguishes people from other animals, though, is intelligence. The reason intelligence evolved is because over time people increasingly existed in social groups, and their ability to reproduce became more dependent on their social status within the group, rather than things like brute strength or body size. Intelligence is to humans as the size of horns are to rams. Our evolutionary history has become an arms race to outsmart other people.
Eventually this evolution led to language, and language evolved as our culture experiences added to it, and over time we gained the ability to conceptualize both the world and ourselves. So what most people usually think of as 'consciousness' is actually just our ability to think and conceptualize in terms of language, because we can know ourselves we feel like an I. But this is also an automatic process. You can't just not think, and in that way it's similar to the deeper, sub-conscious, and also intrinsic to our survival, it just feels like the 'I'.
And I also believe people tend to think that we have some kind of special status re: consciousness, that other animals don't have, but I don't think this is the case. Pending on the animal, they feel like an I too, just without language.
I don't think that's how intelligence evolved. For millions of years humans were snacks for lions in one valley in what now is in Kenya. I think it's more likely that we got smart because we needed to outsmart lions. We were weak on physical strength. Our only real weapon is that we're good at long distance running. On long distances we can outrun almost any animal. But not sprinting. That requires planning. Since we need to respond fast to a variety of threats it requires flexibility and ingenuity. Instead of claws and fangs we evolved grippy fingers. So we needed to evolve intelligence to craft weapons to put in the grippy fingers.
Social animals don't have to be smart. Human societies are nowhere near as complex as ant societies, and they're dumb as bricks.
I have seen a theory that once we started to become intelligent, we used a lot of that effort to fool our peers. Essentially, to lie to eachother, and then evolve to catch lies. Which is what led to an arms race. Especially since intelligence became our peacock feathers. We think it's sexy to be smart. Then evolution will push for it, regardless if it's useful or not.