Until consciousness has a definition and its various aspects can be measured our perceptions of it mean nothing.
The word and the phenomenon have meaning to me. I know what I am referring to when I use the word - a state of awareness of the self apprehending surrounding reality. I do not know what the substance of consciousness is of any, nor how it is generated by the brain, but that doesn't diminish what can be known about consciousness, such as that it is intermittent (sleep), it is a dance of assorted phenomena such as sounds heard, feelings felt, desires, intentions, without which, we lose contact with our environment and body.
So long as you accept that what is true for you has no application to what is true for others I have no dispute with this.
We might not mean the same thing here. I am not saying that what is true for me is only true for me, but rather, that I don't decide what is true for myself or others based on their opinions of truth. Somebody telling me that they know God or that they know that gods don't exist is not understood as truth by me even if it is by the one making the claim, and my understanding of the truth applies to the other even if he doesn't agree. Nobody knows that gods do or do not exist is the truth for me, whether others agree or not.
we don't even really know if we are seeing the same thing
Agreed, but that's not important to me. As long as what I see and how I see it are consistent and allow me to make accurate predictions, what others see doesn't matter to that process. Suppose that you and I could momentarily see through one another's eyes. We already agree that on a sunny day, the sky appears blue and the sun yellow. Suppose the retinal color receptors (cones) were reversed between the two of us, and when I looked through your eyes, the sky appeared what I call yellow (but you call blue) and the sun blue. That would be surprising and interesting, but unimportant. I could learn to use that information to predict the weather as well and decide whether to take a coat and umbrella when going out just as well as before. The truth here isn't what colors we are seeing, but what they signify will follow if anything.
From the Grateful Dead's Scarlet Begonias:
Wind in the willow's playin' "Tea For Two"
The sky was yellow, and the sun was blue
Strangers stoppin' strangers just to shake their hand
Everybody's playing in the heart of gold band, heart of gold band
We ALL begin with assumptions. No matter how good your models are they still differ between individuals and they still rely on many assumptions.
But those assumptions can be tested and empirically confirmed to be valid if they are. Physics has many such assumptions, such as that nothing should be considered true without empirical support, which ought to be observable and any processes observed repeatable and that the laws of physics are the same everywhere and constant. When we apply these principles, we derive laws and theories to account for these observations that then make predictions which can be tested, as when the first eclipse was accurately predicted, or when a manned space probe successfully landed on the moon. When these things happen, the assumptions go from being mere assumptions to tested and confirmed principles.
Successful prediction can not prove real understanding but is strongly indicative.
I don't need more understanding of nature than that.
The use of the word
real before
understanding reminds me of why I try to avoid these metaphysical considerations such as what is absolute truth or ultimate truth, what's really out there before it is transformed by consciousness into something apprehensible. What is the real essence of what appears to be the chair in the room. These questions not only can't be answered, they need not be answered, and have the answers wouldn't be useful unless they allowed us to make predictions about reality more effectively. What is the ultimate nature of the sun and sky beyond what can be gleaned by the application of reason to the evidence of the senses? Does it matter? Even if it's a deity, how does that knowledge matter if it wasn't discernible through the senses and doesn't impact experience?
We're going back to Descartes' demon, last Thursdayism, and brain in a vat or matrix scenarios. What if we were to discover that one of these was the case, was the 'ultimate' reality, knowledge of which was true understanding. Recall the imaginary finger in the imaginary flame. If nothing changes after ascertaining such knowledge, if the knowledge cannot be used to modify experience and affect or accurately predict outcomes more effectively, what use is it, and why all the fuss about not having such answers?
In nature "founder effect" (I don't use these words) is far more extreme than in the lab because bottlenecks select for behavior. NOT FITNESS
Yes, but natural selection selects for fecundity, which is what fitness means in an evolutionary sense, and which is closely allied with behavior but is not limited to it. Camouflage, for example, or threatening coloration, or thorns, makes a living thing more likely to survive to produce fertile offspring apart from its behavior. Consider coronavirus, not a living thing, but something that evolves genetically, gifting the world with new variants even better adapted to spreading in its human reservoir. The fittest virus is the one that is most contagious and causes the least disease. You can't be out there spreading it to new victims of you're dead or at home in bed. Imagine a virus that only created asymptomatic infection, and nobody got sick from it. We'd have never developed a vaccine or put on masks, nor would we quarantine. We'd be trading this virus unimpeded, with the maximum number of copies of it floating around until an even more contagious variant supplanted it. That's a fit virus.