Structure and FunctionIn this brief essay I want to make the case that wherever these two properties are found, they are very closely intertwined and mutually influential. Perhaps the simplest place to introduce this idea is at the small scale of the cell; a Google search of the subject terms yields many pages of sites, almost all of them dealing with the cell, proteins, amino acids etc., exceptions being those that concern mathematical structure functions, which are something else again.
It's interesting that there are no references to larger objects, which is the domain I want to venture into, hoping to produce some generalised statements.For example, the structure of bone and musculature in the human arm affords precisely the ability to make the movements comprising the function of the arm. Conversely, if one wanted to produce a device capable of those functions, one would design something very like the human arm, or for that matter an elephant's trunk.This is leaping ahead a bit, but because I'm keeping it short, I'll go there anyway.
Evolution came about as a result of small changes in the structure of organisms by random mutation of genes enabling an extension or modification of functions that enhanced adaptation to the environment. D'arcy Wentworth Thompson, in his monumental On Growth and Form, argued that there were physical constraints that determined how organisms evolved; they couldn't morph willy-nilly from one form to another, they had to follow an incremental progression which depended on the structure of the evolving form, and of its environment. Of course this is what Darwin stated; Thompson didn't oppose that, in fact he reinforced it by giving it a technical and mathematical grounding. At least that's my understanding, and it is the line of thought that I'm pursuing, more or less.
Going back to the small scale, and back in time to the origins of life, a quick examination soon reveals that early organisms were totally dependent on the chemical mix prevailing on the Earth's surface at that time: a structure, albeit quite fluid. Organisms were formed by that loose stucture and took on their own stuctures in response. Their only function was to exist, by absorbing chemicals, heat and light, and later, other organisms. An early major structural change in organisms was the development of the cell wall. At some point there were enough organisms producing waste gases that they altered the structure of the atmosphere, leading to evolution of more organisms and a wider range of functions. I don't want to go too far into this; there are lots of sources on the Web, eg.
http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=cooper.section.90I'm pretty sure The Origin of Species is available as a full text online, too.
Leaping forward again, there are three key ideas I want to get down. Firstly, that the function of an organisation or institution, right up to a whole society, is highly constrained by its structure.The physical structure of a school or a factory has a strong bearing on the functions performed there. The physical environment as a whole, the infrastructure, is highly influential on the activities (functions) of the population within it.
Of course human beings are not completely at the mercy of their environment. If they want to modify or add to their functioning they can do so voluntarily, if necessary changing the structure accordingly. So this is the second of theses principles, that structure is also dependent on function, where function has the ability to change it. Certain changes to structure or function may depend on structure of another kind, viz. the organisational structure of school boards, management teams of firms, or local councils. This kind of structure may help or hinder change, and will almost certainly affect it. This is an extension of the second idea, but may become one in its own right.
Thirdly, I believe that the functioning on the mind is quite dependent on the structure of the brain, which in turn is dependent on the structure of its environment. Notwithstanding that, the mind is still free to roam wonderfully freely. Or is it? Is that apparent freedom boosted by doses of serotonin or bursts or activity in the amygdala?
I shall continue to dwell upon such matters, probably for the rest of my life, perhaps going quietly mad in the process.