Good Reason

It's okay to be wrong. It's not okay to stay wrong.

Category: science (page 6 of 8)

Amazing artificial arm

God won’t heal amputees, but science sure will.

Amanda Kitts lost her left arm in a car accident three years ago, but these days she plays football with her 12-year-old son, and changes diapers and bearhugs children at the three Kiddie Cottage day care centers she owns in Knoxville, Tenn.

Ms. Kitts, 40, does this all with a new kind of artificial arm that moves more easily than other devices and that she can control by using only her thoughts.

“I’m able to move my hand, wrist and elbow all at the same time,” she said. “You think, and then your muscles move.”

The technique, called targeted muscle reinnervation, involves taking the nerves that remain after an arm is amputated and connecting them to another muscle in the body, often in the chest. Electrodes are placed over the chest muscles, acting as antennae. When the person wants to move the arm, the brain sends signals that first contract the chest muscles, which send an electrical signal to the prosthetic arm, instructing it to move. The process requires no more conscious effort than it would for a person who has a natural arm.

You really ought to take a look at the video. Amazing.

I think it’d be tricky to use the arm and fingers because of the lack of tactile feedback. You’d have to look at the object you’re holding to make sure you had it securely and weren’t squishing it. Maybe in future you’d be able to ‘feel’ the item you’re grasping by some kind of neural feedback.

When some new age creep wants to talk about the shortcomings of Western medicine, they’ll get a face full of this article from me.

Advice for teachers

My head of department asked the postgrads who teach classes to give some advice to new teachers. Here’s what I wrote. I think it applies to areas of teaching beyond linguistics.

= – = – = – = – = – = – = – = – = – = – = – = – = – = – = – =

Here are some ideas to think about, though obviously everyone will have to do things their own way.

• Ask yourself: Why do you like linguistics? You’re probably in this area because you think it’s sort of cool. And it is! So show your students what you love about linguistics. They will pick up on your enthusiasm.

• Try and remember one teacher that you liked. What did they do? Why did you like them? For me, I remember Marge Foland, my drama teacher. She was fun and ‘sparky’, with a zany sense of humour. She expected great work from us, and we were happy to give it. I don’t teach just like she did because I’m a different person, but I do find that that kind of style works for me. Whatever your teacher did that clicks with you is an indicator of a teaching style that you’ll probably do well at.

• Teaching is a lot like parenting. You have to convey expectations clearly to your students, give them nurturing feedback, and dish out consequences when they need it. (Warm and fuzzy, not cold and prickly.) Also, you must like your students.

• People learn by doing things. Try and take every opportunity to present students with real live data, and have them deal with it. Focus on the principle you’re trying to reinforce. Often what will happen is that they’ll run up against the limits of their knowledge, and struggle to find a solution. Then they’re ready for you, the experienced one, to provide some suggestions for moving ahead.

• No one expects you to be infallible, just reasonably well-read and well-informed. A great thing to say is “I don’t know” and the next thing you should always say after that is “How could we find out?” And it’s not bad to follow that up with “If I had to make a guess, I’d say… And the reason I say that is…” When you say these things, you’re preparing them to solve their own problems.

• Let them talk to each other and contribute their unique experiences to the class. I do a lot of small group discussion in tutorials. When I’m doing all the talking in the tutorial, I know something’s wrong. Step back and let them work through the issues without you. You may worry that they’ll reinforce each others’ mistakes, but that doesn’t usually happen. Groups of people are smarter than their smartest member, so they’ve got a better chance of getting it right. Sometimes they come up with ideas I haven’t thought of. And they get a chance to contribute, so they’re building the class.

• Always have a contingency plan. Activities run short or sometimes just don’t work, and you’ll need to have something else to do. Even having a few discussion questions up your sleeve can save the day. Don’t be afraid to toss the lesson plan and have a discussion they’re interested in, if the tutorial goes that way. Let them drive. Some of the best tutorials are like that.

• Teach the scientific method. Our data comes from the physical world. We develop testable and falsifiable hypotheses to explain the data, and if the hypotheses don’t correspond to the facts, we modify or dump them. We have many perceptual filters and biases that prevent us from seeing things clearly, and we have tools like statistics to help us avoid these traps. Find out about them. Use issues in linguistics to teach the basics of critical thinking, including the virtues of open-mindedness and skepticism. Avoid holy wars. By teaching students the scientific method, we’re not just doing good linguistics, we’re building a populace that is better equipped to live in the world, even after they’ve forgotten all the things we’ve presented.

Quick links

Blind people use facial expressions in the same way as sighted people do, including those strained smiles you use when you’re not really happy. This provides more evidence that facial expressions are innate and not learned.

Where do you think love comes from, Mr Atheist? Can’t see love in your microscope, can you? Actually, you can, if you’re doing brain scans. And what they find is that some people still feel twittery about each other after 20 years, instead of the 18 months most of us get. They call these couples ‘swans’, but that’s not a good name. Swans are cranky critters. But I think Ms Perfect and I will still be swanning about, still coursing with dopamine in each other’s presence, even after 20 blissful years.

Fear the hammer of Thor! A man dressed as the God of War after a costume party frightened off a burglar. Maybe the burglar was a philosophical theist who realised that you can’t discriminate between two supernatural claims — it doesn’t matter whether the god is Christian or Norse, you’d better book. Personally, I’d be much more frightened of Thor than of Jesus. People in sandals are easier to outrun. On the other hand, if Jesus has come as that psychopathic Old Testament god, then all bets are off. Best to run first and ask theological questions later.

Another political experiment

How likely are you to be a conservative? It may depend on how easily you scare.

Subjects were tested for political opinions, and categorised as liberal or conservative.

The participants were then given two laboratory tests, to establish their physiological responses to frightening or unexpected stimuli. In the first test, they viewed 33 images, three of which were distressing or threatening: a large spider on the face of a frightened person; a dazed person with a bloody face; and maggots in an open wound. The scientists measured the electrical conductance of the skin, a standard measure of distress and arousal.

In the second test, the volunteers were subjected to a loud, unexpected noise, with scientists measuring the involuntary blinking that followed. A strong startle response is indicative of heightened fear and arousal.

No points for guessing which group contained the bigger scaredy cats.

Those with “markedly lower physical sensitivity to sudden noises and threatening visual images” tended to support liberal positions, while those with strong responses tended to be more conservative.

Acting conservatively is an appropriate response to uncertain and risky situations. Conservatives know this, and therefore try to emphasise the scary side of our world. As a result, modern conservatism is a laundry list of over-stated grievances and fears intended to exploit feelings of resentment and victimhood. They’re coming for your job. Your guns. Your women. Taxes, children, bible, flag. Conservatives, then, are the ones who respond most to this fear-mongering and paranoia.

Courage, citizens.

Zombie memes and the ‘backfire effect’

Some memes just don’t die. Okay, memes about McCain and Palin stay alive because they repeat them even after they’ve been debunked. But what about Obama being a Muslim? What about that creationist on your blog who gets slapped down every week, but who keeps coming back with the same arguments?

There’s an interesting study out of Duke University (PDF here) about how some people resist correcting bad information.

They gave some conservatives and some liberals bad information about politics, and saw how it changed their opinions. When they then gave correct information, liberals adjusted their opinions back, but never quite all the way back to their former level.

When conservatives got the facts, however, they didn’t adjust their views at all. In fact, they actually believed the wrong information more.

Details:

Political scientists Brendan Nyhan and Jason Reifler provided two groups of volunteers with the Bush administration’s prewar claims that Iraq had weapons of mass destruction. One group was given a refutation — the comprehensive 2004 Duelfer report that concluded that Iraq did not have weapons of mass destruction before the United States invaded in 2003. Thirty-four percent of conservatives told only about the Bush administration’s claims thought Iraq had hidden or destroyed its weapons before the U.S. invasion, but 64 percent of conservatives who heard both claim and refutation thought that Iraq really did have the weapons. The refutation, in other words, made the misinformation worse.

A similar “backfire effect” also influenced conservatives told about Bush administration assertions that tax cuts increase federal revenue. One group was offered a refutation by prominent economists that included current and former Bush administration officials. About 35 percent of conservatives told about the Bush claim believed it; 67 percent of those provided with both assertion and refutation believed that tax cuts increase revenue.

In a paper approaching publication, Nyhan, a PhD student at Duke University, and Reifler, at Georgia State University, suggest that Republicans might be especially prone to the backfire effect because conservatives may have more rigid views than liberals: Upon hearing a refutation, conservatives might “argue back” against the refutation in their minds, thereby strengthening their belief in the misinformation. Nyhan and Reifler did not see the same “backfire effect” when liberals were given misinformation and a refutation about the Bush administration’s stance on stem cell research.

False ideas spread quickly when people like them, and they’re incredibly difficult to quash.

Since conservatism is currently the view of choice for the most extreme reality-denying Christianists, I think it’s fair to say that religious (non-)thinking bears more than a smidgeon of the blame for this. Religious thinkers (with whom I have had many discussions) don’t change their minds easily. They think it’s good to live in a fantasy world, and anything that would dissuade them from it is actually a trick from the Crafty One. Add in all the good ol’ folks who don’t trust those fancy-pants ‘experts’ who ‘know things’ and present you with ‘facts’, and you’ve got a sizable group of conservatives.

I find this result unsurprising, but incredibly depressing. How can we have government and consensus in a country where half the people in it won’t accept accurate information, and insist on remaining delusional? And I’m not too sure about you guys in the other half, either.

Thank goodness our Democratic candidates are aware of science and reason, and aren’t trying to pander to the… the… um…


Never mind.

Biden pro-life. Hmm.

I seem to be obsessed with VPs lately.

Senator Joseph R. Biden Jr., the Democratic nominee for vice president, departed Sunday from party doctrine on abortion rights, declaring that as a Catholic, he believes life begins at conception.

Now I know secular folk are in the minority in America. And I suppose Mr Biden can think what he likes about when life begins. But cheese it, people, when will we start addressing issues in an empirical way? The superstition thing is killing us.

Bet it’s a Palin thing.

While Mr. Biden’s views may not be new to Democrats in his circle, his comments, in an interview on “Meet the Press” on NBC, came at a time when his party is confronted with a new face: Gov. Sarah Palin, the Republican vice-presidential nominee, whose anti-abortion stance and decision to give birth just five months ago to a baby with Down syndrome have revved up the conservative base of her party.

Is this some kind of tactic? Or is Biden just saying what he thinks?

It looks like a smart move at first. Palin’s pro-life, so bring out pro-life Biden to minimise the difference. Pull off some pro-life votes. Obama’s holding on to the pro-choice vote over there, so no problem.

It’s a dumb move for two reasons. One, appealing to evangelical Christians is stupid because they aren’t going to vote for a Democrat, and certainly not a Catholic Democrat. Second, most people poll up as pro-choice, and have for decades. Why shift the window toward the anti-choice side, when it’s a position that’s not empirically grounded, repressive, and unpopular? Pro-lifers won’t be happy to simply ban abortion. They’re already calling for the abolition of certain kinds of birth control. Why cede any ground their way at all?

I could forgive Biden if he’d simply strayed off-message, but if this is a tactic, it’s a lousy one.

Zing!

Still laughing over this snippet from a Dawkins talkback radio session yesterday.

Dawkins and the radio host talk about what it would have been like to meet Darwin, and the host asks:

Dawkins doesn’t miss a beat.

Shermer lecture: How do we influence others?

Michael Shermer gave an engaging lecture Wednesday night at UWA’s Octagon Theatre. Since it was Science Week, he spoke on the scientific method, and the need for skepticism in evaluating ideas.

And I got to ask him a question. I mentioned in this post that I think he’s backed the wrong horse on the science v. religion question. In ‘Why Darwin Matters’, he seemed to lean toward the ‘Non-Overlapping Magesteria Argument’ — that science is science and spirituality is spirituality, and science can’t examine spirituality. Besides the gaping holes in the argument, it’s just an unscientific view. How can you falsify it?

But I didn’t want to fight over that — I’m sure he knows the terrain. No, I was more curious about the strategy of it all. Here was my question:

Me: I’ve enjoyed reading “Why Darwin Matters.” You give three possibilities for the relationship between science and religion. One is the Conflicting Worlds model, the Same Worlds model, and the Shared Worlds. You seem to reject the idea that science is right and religion is wrong, as an extremist position. Instead you seem to say that God is somehow outside of science.

I was wondering if that’s really your view, (audience laughter) or is this some kind of tactic that we use to lull the religious to sleep so that the grown-ups can do their work?

Shermer: A sop (unintelligible), yes. No, I do think it’s important to strategise how to interact with other people. And if you tell somebody that their most cherished beliefs are bullshit, (bright tone) and now let’s go to the ball game and have fun together! (audience laughter) You know, that isn’t probably the best way to win friends and influence people. It’s always good to try to be polite and respectful and whatever — you’re more likely to change their minds. That’s isn’t necessarily why I do it; that’s the way I am.

But the argument I make is that — that’s why I went through that whole business of aliens and Shermer’s Last Law and all that stuff. You can’t possibly find a god. Most people think of god as this supernatural being, that isn’t just some garage tinkerer, that isn’t just a genetic engineer who’s really good at it. That somehow that isn’t going to fulfill what people think when they think about god. So I really don’t… I can’t possibly imagine any experiment that any scientist could ever run and go, “Oh, look! There is a god! Wow!” Or “Nope! There isn’t, ’cause look. Failed the experiment.” Something like that. I just don’t think you could do that.

Now Dawkins makes an interesting argument in ‘The God Delusion’ about probabilities, that, you know, on a range… a scale of one to seven, what’s the likelihood? No, we can’t say for sure that there isn’t a god, but there probably isn’t. That’s a reasonable argument. But there you’re not using science directly to test the godly probabilities. It’s something slightly different than that.

Did he answer my question?

In a way, kind of. I was left with the feeling like he’s just being nice and giving religious folk on the edges a way to accept Darwin and science. Off the point, he argues that you can’t falsify the supernatural, to which I readily agree.

But this touches on what should be a major issue among atheists: How do you change people’s minds? Shermer’s right: confronting people directly about their beliefs won’t change their minds. You know what else doesn’t change people’s minds? Not confronting them directly about their beliefs. Thinking back to my days as a believer, if you’d said that I could keep my beliefs, that they were perfectly good, but that science is good too, I’ll guarantee you I’d have left the discussion thinking exactly what I was thinking before.

So what does change people’s minds? Well, in many cases, nothing. If people really want to believe in ghosts or UFO’s or Reiki, no evidence will shift ’em. But there are a certain number of smart people who are in a belief system, and eventually they’ll notice the contradictions and feel enough cognitive dissonance to reach escape velocity. For these people, we need to foster a climate where science and evidence are regarded as authoritative and where disbelief is supported (intellectually and socially), until they’re ready to make the jump. Shermer’s certainly doing his part in this by giving lectures about science and scepticism, with intelligence and good humour. I’m doing my part in this by pointing out firmly (and repeatedly) that no evidence exists for the supernatural, and inviting people to show me some. I don’t sugar-coat my point of view, but I don’t think that’ll turn anyone off; the deeply committed won’t listen anyway. And I think it’s important to be direct with people.

Education is one way of promoting good views. Ridicule is one way of discouraging bad views. I do both. If you can’t manage it, you’re only using half the tools at your disposal. But do what you’re comfortable with. I’ll be over here holding the Overton Window on my end. Go ahead and slag me off and call me a militant atheist and an extremist, so you can look moderate by comparison. That’s absolutely part of the strategy. I don’t mind; I’ll take it for the team.

Just please remember that the forces of anti-science are not content to just believe what they believe. They want to influence what everyone believes. Religions constantly expend a great deal of energy in proselyting. They send missionaries around the world, they build publishing factories, and they go about promoting their memes in an organised way. So let’s not kid ourselves that they just want to play softball.

Who’s smarter, the journalist or the bird?

Glad to see someone else is taking the piss out of talking psychic birds besides me.


Damn, but the BBC Science press is useless. They’re the ones responsible for that ‘cow accents‘ thing a couple of years ago.

It’s particularly clever that the author also makes a commentary about how people take advantage of the inherent tentativeness of scientific conclusions.

An airtight case

Miss Perfect and I observed the condensation on the window on a lovely morning.

“That’s odd,” said I. The streaks of water only start from a certain place.”


“The droplets must have some kind of critical mass at that part of the condensation cloud,” said Miss P.

“Or could raindrops be hitting the window only at that point?” I wondered.

We noticed that the condensation was on the inside of the window.

“Critical mass, then,” said I. “But how do we explain the bar with no streaks on the left?”

“Very strange,” said Miss P.

“Well,” said I, “I think we’ve exhausted the natural explanations and it’s time to resort… to the supernatural.”

“It must be the Window Fairy,” said she.

“Indeed,” said I. “There’s no other explanation. Now some may say that it’s just condensation. But who do they think created condensation in the first place?”

Miss P. agreed. “The Window Fairy works through condensation, in her infinite wisdom. Or his wisdom. We don’t know yet whether it’s a boy or a girl.”

“Let’s not get speculative,” said I. “It may not be important to our salvation.”

“There is still much we do not know about the Window Fairy,” said she. “But we trust that our understanding will grow as he or she reveals more about him or herself.”

I nodded. “We aren’t arrogant like scientists, thinking we know everything. One day, they too will know the truth as we do.”

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