Listening To The Voices In Other People's Heads

Here's a very nice long read from the Guardian about trying to understand what's really going on inside our heads.

Recently I concluded that any attempt to understand what consciousness actually is is likely hopeless. Trying to understand what we mean by experience when literally all we have access to is experience is inevitably circular. But the effort itself isn't fruitless. We can all of us have different preferences for what we think is going on – non-physical, spiritual, purely materialistic – and that discussion is often productive, if only in understanding other perspectives. More promisingly, it gives us a better handle on how we go about defining things, how we grapple with the imperfections of mapping language onto reality.

But there were also two more directly productive outcomes described in the Aeon essay I looked at last time. One was that we could understand in some detail the neural correlates of consciousness, the processes occurring within the brain that are associated with what we think and experience. The second, somewhat subtler issue, was that we can still take a reductive approach to different aspects of consciousness : we can describe it in terms of different levels and content, and in so doing get back to something we can discuss in familiar scientific terms. Just as we don't have to worry about what a quark is really made of to understand how it behaves, so too we can tackle the subject of minds.

The Guardian piece is complementary to the Aeon article in that it leans more heavily in this direction. As it begins :

A neuroscientific perspective on consciousness might tell us something about its neural correlates, but it is unlikely to tell us much, if anything, about the nature of thoughts or the textures of inner experience; it’s the wrong tool for that job. So what might we learn about consciousness if we gave more weight to the view from inside the experience – the phenomenological viewpoint ?

For example, it describes William James' comments on something I've found extremely strange for many years :

“Suppose we try to recall a forgotten name,” he writes. “The state of our consciousness is peculiar. There is a gap therein; but no mere gap. It is a gap that is intensely active.” A sort of ghost of the absent name haunts the empty space in our consciousness, he suggests, making us “tingle with the sense of our closeness, and then letting us sink back without the longed-​for term”.

He goes on: let someone propose a candidate for the missing name, he suggests, and even though we have no consciousness of what the name is, we are somehow conscious of what it is not, and so summarily reject it. How strange! Our consciousness of one absence is completely different from our consciousness of another. But, he asks, “how can the two consciousnesses be different when the terms which might make them different are not there ?” 

The feeling of an absence in our minds is nothing like the absence of a feeling; to the contrary, this is an absence that is highly specific and intensely felt. Thoughts glimpsed from some height of awareness but somehow not yet formed, much less put into words or images – this is the subtle terrain James invites us to explore with him.

I very much agree with this. It's always seemed weird to me how we can think in complete sentences. We – or rather I, and I'll get back to why the distinction matters later on – don't really sense the words falling into place, they just come out like that. Yet clearly they must have been assembled at some point, but without us knowing about it ! 

Perhaps even weirder is that sensation when grappling with a complex problem : at the point of reaching a possible solution comes a very distinct sensation of raw, unstructured thought, some quasi-awareness that the answer has been reached but without being able to articulate it. That moment is crucial. If interrupted in this momentary phase, the proto-thought may be lost entirely. But if it's seen through to completion, the thought crystallises into language : something we can easily memorise, recall, and communicate with others.

Much of the article is then concerned with whether we can access this much lower level of thinking in some way. If we want to understand consciousness, can be go beyond language ? Maybe that's too ambitious. To start with, can we at least access thoughts at the stage that they become coherent ? 

Step forth, Russell T. Hurlburt :

For half a century now, Hurlburt has been scrupulously collecting reports of people’s inner experiences at random moments – and just as scrupulously resisting the urge to draw premature conclusions. A die-​hard empiricist, he is as devoted to data as he is allergic to theories... I’ve been going around with a beeper wired to an earpiece that sends a sudden sharp note into my left ear at random times of the day. This is my cue to recall and jot down whatever was going on in my head immediately before I registered the beep. The idea is to capture a snapshot of the contents of consciousness at a specific moment in time by dipping a ladle into the onrushing stream.

What he is after in his research is the “pristine inner experience”, by which he means a sample of human thought “unspoiled by the act of observation or reflection”. Like James, Hurlburt acknowledges that the act of recalling and describing an experience is bound to alter it, but he believes that his method can get us closer to the uncontaminated ideal than any other.

In some ways this should be extremely easy. Again, we definitely do have coherent, structured, linguistic thoughts, and writing those down is straightforward enough. Indeed, as this fascinating BBC article describes, it's even possible to read these directly from the brain. This doesn't require participants to mentally try and speak : to a degree, thoughts can now be extracted at a lower level than this.

But then again, even the most fully-developed thoughts can be extremely slippery. As I've noted, once you put pen to paper you engage in a sort of self-conversation, thoughts and beliefs becoming highly flexible once you start reflecting back on them from an external input. Take a thought from in here and put it out there and it inevitably changes, even if only just a little. 

Still, this can largely be avoided : once a sentence is formed, it can be written down. A more difficult aspect of the problem is trying to disentangle that bit of coherency from everything else we're thinking about :

I took out the little pad provided by Hurlburt and jotted down this thought: “Deciding whether or not to buy a roll.” I know, not terribly exciting, but it seems very few of my mental contents are. I was thinking ahead to lunch and wordlessly deliberating whether to buy a fresh roll for a sandwich or do the responsible thing and use up the heel of bread I had at home. I was also conscious of the pattern of the skirt – an unflatteringly large plaid – worn by the woman standing in line ahead of me. 

Was that observation part of the moment in question, or did it come immediately before or after? I couldn’t say for sure. (How long does a moment in consciousness last ?) And what about the pervasive smells of freshly baked goods and cheese ? These both preceded and followed the moment under examination, but were they present to my awareness at the beep ?

Throw in just a few complications and suddenly the problem becomes much more difficult, maybe even impossible. Words ? We can attend to them. The whole facet of experience, including our different senses, how they affect us, when they occur, when we assemble a sentence ? That's much more fuzzy. Trying to describe anything before the point of coherency may even be a non sequitur. Maybe we can pin down a bit more about the process by determining what we're currently experiencing (e.g. which senses are given priority over the others, where and when we give out conscious attention to language rather than sensory experience, what counts as thought, etc.) but there will be some limits as to how far we can get with this.

Some really fascinating things have come out of this though :

The first finding, to which I can personally attest, is just how little most of us know about the characteristics of our own inner experiences. “That’s probably the most important finding that I’ve got,” Hurlburt said.

Important, yes, but I think the other findings are a lot more interesting : 

Inner speech, which many of us – including many philosophers and neuroscientists – believe is the common currency of consciousness, may actually not be all that common. Hurlburt estimates that only a minority of us are “inner speakers”. So why do we think we talk to ourselves all the time? Perhaps because we have little choice but to resort to language when asked to express what we are thinking. As a result, we’re “likely to assume that’s the medium for inner thought”.

But that doesn’t make it true for everyone. Fewer than a quarter of the samples that Hurlburt has gathered report experiences of inner speech. A slightly lower percentage report either inner seeing, feeling, or sensory awareness. Still another fifth of his samples report experiences of “unsymbolised” thought – complete thoughts made up of neither words nor images. Hurlburt has suggested that we fail to recognise the diversity of thinking styles because we lump them all together under that single word – thinking – and assume we mean the same thing by it, though in actuality we don’t.

Aphantasia and the lack of inner speech is something I've covered many times before, but this is something beyond that. It's something I know I must have but am absolutely incapable of imagining. A truly pure thought consisting of... what, exactly ? Not language. Not any of the senses. Just pure electrochemistry, I guess. That's absolutely wild. 

I wonder if the brain scans described in the BBC would be capable of interpreting these in the same way as for the (to me normal) case of thinking with an inner voice or eye. Perhaps it's like blindsight. That is, maybe our brains are all doing basically the same low-level stuff, but sometimes not everything is raised to whatever part it is that brings it to conscious awareness. Or maybe, even more interestingly, we don't all work in quite the same way. Regardless, scans of people who aren't thinking with inner speech, imagery, or any kind of structured thoughts would surely make for a fascinating comparison. Would the scan reveal the same thing as in those with well-defined internal monologues or would it show something else altogether ?

Another researcher suggests a different and more holistic approach :

The field’s focus on conscious perception has led it to overlook the 30-50% of mental experience that is fed to us by our minds rather than our senses, Kalina Christoff Hadjiilieva contends. “Consciousness is just one function of the mind,” Hadjiilieva told me during one of a half-​dozen interviews, this session over a cup of tea in my garden. “To focus on conscious thoughts is like focusing on the leaves of a tree and trying to understand them in isolation,” she said. “The tree is the mind, and there’s a lot more to the mind than consciousness.”

The degree to which the mind wanders appears to be surprisingly important :

Hadjiilieva conducted an experiment with long-​term meditators (mindfulness practitioners). These are people who have been trained to still their minds but also to notice the precise moment when that stillness is broken by an errant thought, which Hadjiilieva found happens every 10 to 20 seconds or so even in these trained minds. (“The big lesson of meditation,” she said, “is that the mind cannot be controlled.”)

This makes intuitive sense to me, and again maybe reveal something about the structure of thought processes. The way I like to work even, when in a state of relative focus, is often to flit back and forth between a couple of different things at once. I like to check my emails and glance at the news quite frequently, only going into really deep focus every once in a while. What's crucial for me, though, is that these must be activities of my own choosing. Being disturbed by an external influence is a big no-no, like having my brain keep working on the other thing in the background while giving my consciousness time to rest. If someone interrupts me then the process is instantly broken.

This all ties is quite nicely to the earlier discussion :

Hadjiilieva and her colleagues noted a jump in activity within the hippocampus, a key component of the default mode network that is involved in not only memory but also learning and spatial navigation. To their surprise, the leap in hippocampal activity preceded the arrival of the thought in the meditator’s consciousness by nearly four seconds – an epoch in brain time, and far longer than it takes for a sensory impression to cross the threshold of our awareness.

You might wonder if this further shifts my uncertainty about the apparent non-physical nature consciousness. In this case, it doesn't. I've already covered similar experiments regarding free will, and here it seems to me that no neural correlate could be anything remotely like subjective experience : how do some electrons whizzing about resemble a daffodil ? They simply don't, and to assume otherwise is to completely miss the point of the Hard Problem. But to build on from the previous post, this is still very interesting stuff : 

“Something is going on prior to awareness,” Christoff Hadjiilieva said, but she’s not sure exactly what it is or why it takes so long. This finding indicates that a spontaneous thought must undergo some sort of complicated unconscious processing before finding (or forcing) its way into the stream of consciousness. For Hadjiilieva, the mystery she’s uncovered points to what she regards as the “really hard problem of consciousness” – how the contents of the unconscious form into thoughts that sometimes find their way into our awareness, and sometimes don’t.

Well, that's definitely a hard problem, and maybe it would even be better to call it the hard problem. The Hard Problem of the philosophical sense may well turn out to be the Impossible Problem, since we can't understand our own perception since by definition this is all we have access to. In that case some relabelling makes good sense. It seems very reasonable that time delay points towards the brain doing some unconscious information processing before raising it to our awareness, and understanding how and why this happens seems extremely difficult but far from outright impossible.

The article concludes, in typical Guardian fashion, with a warning of the dangers of capitalism in preventing our minds from their productive wanderings, as well as the difficulties of persuading people to treat research into the subconscious as serious science. Perhaps the author should have read that BBC story. If you can access this with a machine, the danger may not be that nobody takes it seriously, but the exact opposite.