(From Girl, Interrupted by Susanna Kaysen. It's long, but funny. Trust me)
Whatever we call it--mind, character, soul--we like to think we possess something that is greater than the sum of our neurons that "animates" us.
A lot of mind, though, is turning out to be brain. A memory is a particular pattern of cellular changes on particular spots in our heads. A mood is a compound of neurotransmitters. Too much acetylcholine, not enough serotonin, and you've got depression.
So, what's left of mind?
It's a long way from not having enough serotonin to thinking the world is "stale, flat and unprofitable"; even further to writing a play about a man driven by that thought. That leaves a lot of mind room. Something is interpreting the clatter of neurological activity.
But is this interpreter necessarily metaphysical and unembodied? Isn't it probably a number--an enormous number--of brain functions working in parallel? If the entire network of simultaneous tiny actions that constitute a thought were identified and mapped, then "mind" might be visible.
The interpreter is convinced it's unmappable and invisible. "I'm your mind," it claims. "You can't parse me into dendrites and synapses."
It's full of claims and reasons. "You're a little depressed because of all the stress at work," it says. (It never says, "You're a little depressed because your serotonin level has dropped."
Sometimes its interpretations are not credible, as when you cut your finger and it starts yelling, "You're gonna die!" Sometimes its claims are unlikely, as when it says, "Twenty-five chocolate chip cookies would be the perfect dinner."
Often, then, it doesn't know what it's talking about. And when you decide it's wrong, who or what is making that decision? A second, superior interpreter?
Why stop at two? That's the problem with this model. It's endless. Each interpreter needs a boss to report to.
But something about this model describes the essence of our experience of consciousness. There is thought, and then there is thinking about thoughts, and they don't feel the same. They must reflect quite different aspects of brain function.
The point is, the brain talks to itself, and by talking to itself changes it perception. To make a new version of the not-entirely-false model, imagine the first interpreter as a foreign correspondent, reporting from the world. The world in this case means everything out- or inside our bodie, including serotonin levels in the brain. The second interpreter is a news analyst, who writes op-ed pieces. They read each other's work. One needs data, the other needs an overview; they influence each other. They get dialogues going.
INTERPRETER ONE: Pain in the left foot, back of heel.
INTERPRETER TWO: I believe that's because the shoe is too tight.
INTERPETER ONE: Checked that. Took off the shoe. Foot still hurts.
INTERPRETER TWO: Did you look at it?
INTERPRETER ONE: Looking. It's red.
INTERPRETER TWO: No blood?
INTERPRETER ONE: Nope.
INTERPRETER TWO: Forget about it.
INTERPRETER ONE: Okay.
A minute later, though, there's another report.
INTERPRETER ONE: Pain in the left foot, back of heel.
INTERPRETER TWO: I know that already.
INTERPRETER ONE: Still hurts. Now it's puffed up.
INTERPRETER TWO: It's just a blister. Forget about it.
INTERPRETER ONE: Okay.
Two minutes later.
INTERPRETER TWO: Don't pick it!
INTERPRETER ONE: It'll feel better if I pop it.
INTERPRETER TWO: That's what you think. Leave it alone.
NTERPRETER ONE: Okay. Still hurts, though.
Mental illness seems to be a communication problem between interpreters one and two.
An exemplary piece of confusion:
INTERPRETER ONE: There's a tiger in the corner.
INTERPRETER TWO: No, that's not a tiger--that's a bureau.
INTERPRETER ONE: It's a tiger, it's a tiger!
INTERPRETER TWO: Don't be ridiculous. Let's go look at it.
Then all the dendrites and neurons and serotonin levels and interpreters collect themselves and trot over to the corner.
If you are not crazy, the second interpreter's assertion, that this is a bureau, will be acceptable to the first interpreter. If you are crazy, the first interpreter's viewpoint, the tiger theory, will prevail.