Journal Journal: i thought so
The Origin of Consciousness
-Porges, et al. "Thinking About Thought"
How does consciousness arise? It is a widespread belief that we, as individuals, are not born conscious, and life, as a natural phenomenon, was not originally conscious. If these beliefs are correct, when and how does consciousness arise?
One problem is to assess where consciousness is "located" in the brain. A related problem is to understand how it is generated by brain processes. And that may be reduced to the "ontogenetic" problem of how consciousness "grows" during the lifetime of an individual. Another problem is to figure out what has it and what does not have it. This may be related to the "phylogenetic" problem of how it was created in the first place: did it evolve from non-conscious matter over million of years or was it born abruptly?
How and when and why did consciousness develop? Opinions vary. Julian Jaynes believes that it is a recent phenomenon, Eccles thinks that it arose with the advent of mammalian neocortex, about 200 million years ago, the biologist Lynn Margulist things that it was a property of even simple unicellular organisms of several billion years ago.
There is growing consensus that it somehow owes its existence to the fact that humans evolved in a highly connected group, that it is related to the need to communicate with or differentiate from peers.
The idea that consciousness is closely related to language is pervasive.
The influential Austrian philosopher Karl Popper thought that, phylogenetically speaking, consciousness emerged with the faculty of language, and, ontogenetically speaking, it emerges during growth with the faculty of language.
Michael Arbib advanced the hypothesis that first language developed, as a tool to communicate with other members of the group in order to coordinate group action; then communication evolved beyond the individual-to-individual sphere into the self sphere.
Their intuitions and findings are consistent with the view held by the American biologist George Herbert Mead, that consciousness is a product of socialization among biological organisms. Language simply provides the medium for its emergence. The mind is socially constructed, society constitutes an individual as much as the individual constitutes society.
The mind emerges through a process of internalization of the social process of communication, for example by reflecting to oneself the reaction of other individuals to one's gestures. The minded organism is capable of being an object of communication to itself. Gestures, which signal the existence of a symbol (and a meaning) that is being communicated (i.e., recalled in the other individual), constitute the building blocks of language. "A symbol is the stimulus whose response is given in advance". Meaning is defined by the relation between the gesture and the subsequent behavior of an organism as indicated to another organism by that gesture. The mechanism of meaning is therefore present in the social act before the consciousness of it emerges.
Consciousness is not in the brain, but in the world. It refers to both the organism and the environment, and cannot be located simply in either. What is in the brain is the process by which the self gains and loses consciousness (analogous to pulling down and raising a window shade).
The philosopher Daniel Dennett offers an even more detailed route to consciousness: consciousness evolved from non-consciousness to reasoning and then to deal with memes. Again, memes represent culture.
The psychologist Nicholas Humphrey agrees that the function of consciousness is that of social interaction with other "consciousnesses". Consciousness gives every human a privileged picture of her own self as a model for what it is like to be another human. Consciousness provides humans with an explanatory model of their own behavior, and this skill is useful for survival: in a sense, the best psychologists are the best survivors. .
Humphrey speculates that, by exploring their own selves, humans gained the ability to understand other humans; by understanding their own minds, they understood the minds of the individuals they shared their life with.
In 1985, the anthropologist Kenneth Oakley speculated that there may be three level of consciousness, corresponding to the three evolutionary layers of the brain: awareness, controlled by the older part of the brain and related only to conditioning; consciousness, controlled by the cortex and the hippocampus, and related to internal representation of the world; and self-awareness, due to the most recent layer of the brain and related to the internal representation of one's internal representation.
The American anthropologist Terrence Deacon takes a "semiotic" approach to consciousness. He distinguishes three types of consciousness, based on the three types of signs: iconic, indexical and symbolic. The first two types of reference are supported by all nervous systems, therefore they may well be ubiquitous among animals. But symbolic reference is different because, in his view, it involves other individuals, it is a shared reference, it requires the capability to communicate with others. It is, therefore, exclusive to linguistic beings, i.e. to humans. Such symbolic reference includes the self: the self is a symbolic self. The symbolic self is not reducible to the iconic and indexical references. The self is not bounded within a body, it is one of those "shared" references.
With very few exceptions there seems to be general consensus that consciousness arose with the need for communication.
A minority sees consciousness as useful to find solutions to practical problems. The philosopher David Malet Armstrong, for example, argues that the biological function of consciousness is to sophisticate the mental processes so that they yield more interesting action.
The truth is that today consciousness hardly contributes to survival. We often get depressed because we are conscious of what happens to us. We get depressed just thinking of future things, such as death. Consciousness often results in less determination and perseverance. Consciousness cannot be the ultimate product of Darwinian evolution towards more and more sophisticated survival systems, because it actually weakens our survival system.
Consciousness' apparent uselessness for survival could be easily explained if we tipped our reference frame. It is generally assumed that humans' ancestors had no consciousness and consciousness slowly developed over evolutionary time. Maybe it goes the other way around: consciousness has always existed, and during evolution most species have lost part of it. Being too self-aware does hurt our chances of surviving and reproducing. Maybe evolution is indirectly improving species by reducing their self-awareness.