Mar 08 2009

FMRI “Mind Reading” Doesn’t Yet Threaten Humanity

visual-image-reconstruction-from-fmri

It is now possible to see what a person is looking at by scanning their brain. The technique, published last November by a team of Japanese neuroscientists, uses FMRI to reconstruct a digital image of the picture entering the eye, albeit at very low resolution and only after hundreds of training runs. Still, it’s an awesome development, and many articles covering this research have called it “mind reading” (1, 2, 3, 4, 5). But it really isn’t, and it’s fun to explore what real “mind reading” would imply.

When I hear “mind reading” I want psychic abilities. I want to be able to know what number you’re thinking of, where you were on the night of March 4th, and what you actually think of my souffle. This is the sort of technology that could be badly misused, as the comments on one blog note:

Am I the only one finding this DEEPLY disturbing? It opens the doors to some of the scariest 1984-style total-control future predictions. Imagine you can’t hide your f#&%!ng MIND!

Fortunately, we’re not there yet. Morover, if we did have the technology to read minds, we’d have much bigger societal issues than privacy to deal with. The existence of “mind reading machines” would imply that we possessed good formal models of the human mind, and that is a can of worms.

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Sep 05 2008

Beauty is Not in the Beholder

The “beauty myth” holds that attractiveness is a cultural construct, a control mechanism of the patriarchy, a way to sell us cosmetics we do not need. Modern social theory says that the beauty of the face and body depends on when and whom you ask, and that we could learn to love anyone if only our iron-maiden social norms permitted it. This is a pleasing thought. It says that accidents of ancestry do not truly count. Unfortunately, when we actually do the experiments and test nature versus nurture in the case of facial attractiveness, genetics wins. Facial beauty is, quite emphatically, not culturally defined.

The best survey is a meta-analysis by Langlois and colleagues, published in the Psychological Bulletin in 2000. They did an exhaustive search of the experimental literature on facial “attractiveness” and ended up including 919 separate experiments on how attractiveness is perceived, how we judge ourselves and others based on attractiveness, and how attractive versus unattractive people actually behave. It turns out that facial beauty is “real” in the sense that it does not depend on who you ask; ratings of attractiveness are very stable across ethnicities, cultures, age, and gender:

Both our cross-cultural and cross-ethnic agreement effect sizes are more than double the size necessary to be considered large, suggesting a possibly universal standard by which attractiveness is judged. These analyses seriously question the common assumption that attractiveness ratings are culturally unique and merely represent media-induced standards. These findings are consistent with the fact that even young infants prefer the same faces as adults.

If beauty was a cultural construct, we would expect different cultures to rate the same people differently. However, we might imagine that global media has erased the diversity that used to exist. This is why the experiments with children and babies are so important: if beauty is learned, then children would have to learn it, presumably beginning in early childhood. Yet the age of the beholder seems not to matter at all in subjective rankings of the attractiveness of others, and even newborn babies will look longer at photographs of people that adults have judged “attractive.” This cannot be learned behavior.

When we check the evidence, (facial) beauty standards seem to be universal and innate (biological). Doubtless, this is going to upset some people.

Here is what I think happened: we saw beauty used as a weapon. We saw women especially destroying their self-image under the assumption that they were ugly. Capitalism grew up around selling to our insecurities, and yes, the patriarchy said that girls were only as valuable as their looks. In defense, we decided that beauty was a myth. We tried to escape from these traps by telling ourselves that the object of contention didn’t exist.

But it does. Some people really are more beautiful than others, says our universal physiological nature. Accepting this implies a new social project. Rather than trying to teach ourselves that beauty does not exist, perhaps we should be trying to decouple value from beauty. It’s not that everyone is equally attractive, it’s just that attractiveness, like intelligence, doesn’t actually make you a “better” person. The corollary is that it’s worth understanding what roles beauty actually plays in human life, both cultural and psychological. What emotions does a beautiful face trigger in others? What assumptions are made? What does beauty actually do? While beauty may be objective, our reactions to it may still be learned.

The situation is somewhat analogous to the violent impulses that everyone is capable of: rather than pretending that anger doesn’t exist, we learn to deal with it in some healthy way. Similarly, it seems to me to be far healthier in the long run to acknowledge that beauty, at least facial beauty, is real and universal. To the best of our knowledge so far, this also has the advantage of being true.

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Aug 02 2008

Minds Are Tricky Things — Part III

Everybody thinks they know how their mind works, but they don’t. You can ask someone why they like their boyfriend, or why they chose a job, or whether a book changed their opinion of global warming, and they’ll think about it for a moment and happily give you an answer. But they’re making it up.

The experiments were done ages ago, and the research is still going, continuing to tease apart actual cause and psychological effect. We know now that what people tell us about their own mental processes is quite thoroughly inaccurate. We all believe that we have this magic thing called “introspection” that lets us see what is going on in our own minds, but in reality we don’t. It’s a fictional superpower.

The research on this point is really quite good. It’s not even a new finding, having been understood for at least the last fifty years. And yet this simple but important fact has never quite managed to make it into popular culture.

Perhaps no one wants to believe it.

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Jul 24 2008

Minds Are Tricky Things — Part II

In a fit of recursion, I am going to begin my discussion of the scientific understanding of the mind by bringing up a piece of psychology research into how people perceive neuro-imaging. This not only gives a taste of what different types of research can be like, but reveals something rather disturbing: merely adding a brain scan image or two makes people more likely to rate an article as scientifically sound. This gets us into questions of what is and isn’t a good reason to believe any particular research conclusion, which is ultimately what I want to talk about in this series of articles.

At the present time there are basically two technologies that can give us some idea of the activity of a working brain: positron-emission topography (PET) and functional magnetic-resonance imaging (fMRI). They both have important limitations in terms of resolution, what they actually measure, and many other things besides, but they’re also pretty amazing technologies. They produce detailed 3D maps of the “activity” of a whole brain, which are often represented like this:

A Functional Magnetic Resonance Imaging (fMRI) image

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Jul 22 2008

Minds Are Tricky Things — Part I

I’ve been reading the literature on neuroscience, cognitive linguistics, psychology and such for a long time now, and the temptation to write about what’s new is overwhelming. There are so many exciting things being learned, and equally there are so many subtle problems of how we can know anything at all about the subjective world. But before I can bombard you with chewy words like “affect” and “epistemology,” I need to explain why any of this matters. It matters because people matter.

It is a difficult and ancient fact that we as conscious beings don’t live in the real world. There are boundaries to what we know and what we can know. I am right now sitting on a couch in my house in Oakland, California. Across the ocean, there is a woman sitting on the floor of her Tokyo apartment. I have never met her, but she is just as much a part of the world as I am. Not my world though. There seem to be boundaries to the things I perceive. Figuring out those boundaries and how things get into and out of them is the process of figuring out me, and everyone else too.

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