Categories
quotes

Quote #301

We’ve been led into a culture that has been engineered to leave us tired, hungry for indulgence, willing to pay a lot for convenience and entertainment, and most importantly, vaguely dissatisfied with our lives so that we continue wanting things we don’t have. We buy so much because it always seems like something is still missing

David Cain, in Your Lifestyle Has Already Been Designed

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quotes Uncategorized

Quote #300: Graeber on the popular appeal of the right

One of the perennial complaints of the progressive left is that so many working-class Americans vote against their own economic interests—actively supporting Republican candidates who promise to slash programs that provide their families with heating oil, who savage their schools and privatize their Medicare. To some degree the reason is simply that the scraps the Democratic Party is now willing to throw its “base” at this point are so paltry it’s hard not to see their offers as an insult: especially when it comes down to the Bill Clinton– or Barack Obama–style argument “we’re not really going to fight for you, but then, why should we? It’s not really in our self-interest when we know you have no choice but to vote for us anyway.” Still, while this may be a compelling reason to avoid voting altogether—and, indeed, most working Americans have long since given up on the electoral process—it doesn’t explain voting for the other side.

The only way to explain this is not that they are somehow confused about their self-interest, but that they are indignant at the very idea that self-interest is all that politics could ever be about. The rhetoric of austerity, of “shared sacrifice” to save one’s children from the terrible consequences of government debt, might be a cynical lie, just a way of distributing even more wealth to the 1 percent, but such rhetoric at least gives ordinary people a certain credit for nobility. At a time when, for most Americans, there really isn’t anything around them worth calling a “community,” at least this is something they can do for everybody else.

The moment we realize that most Americans are not cynics, the appeal of right-wing populism becomes much easier to understand. It comes, often enough, surrounded by the most vile sorts of racism, sexism, homophobia. But what lies behind it is a genuine indignation at being cut off from the means for doing good.

Take two of the most familiar rallying cries of the populist right: hatred of the “cultural elite” and constant calls to “support our troops.” On the surface, it seems these would have nothing to do with each other. In fact, they are profoundly linked. It might seem strange that so many working-class Americans would resent that fraction of the 1 percent who work in the culture industry more than they do oil tycoons and HMO executives, but it actually represents a fairly realistic assessment of their situation: an air conditioner repairman from Nebraska is aware that while it is exceedingly unlikely that his child would ever become CEO of a large corporation, it could possibly happen; but it’s utterly unimaginable that she will ever become an international human rights lawyer or drama critic for The New York Times. Most obviously, if you wish to pursue a career that isn’t simply for the money—a career in the arts, in politics, social welfare, journalism, that is, a life dedicated to pursuing some value other than money, whether that be the pursuit of truth, beauty, charity—for the first year or two, your employers will simply refuse to pay you. As I myself discovered on graduating college, an impenetrable bastion of unpaid internships places any such careers permanently outside the reach of anyone who can’t fund several years’ free residence in a city like New York or San Francisco—which, most obviously, immediately eliminates any child of the working class. What this means in practice is that not only do the children of this (increasingly in-marrying, exclusive) class of sophisticates see most working-class Americans as so many knuckle-dragging cavemen, which is infuriating enough, but that they have developed a clever system to monopolize, for their own children, all lines of work where one can both earn a decent living and also pursue something selfless or noble. If an air conditioner repairman’s daughter does aspire to a career where she can serve some calling higher than herself, she really only has two realistic options: she can work for her local church, or she can join the army.

This was, I am convinced, the secret of the peculiar popular appeal of George W. Bush, a man born to one of the richest families in America: he talked, and acted, like a man that felt more comfortable around soldiers than professors. The militant anti-intellectualism of the populist right is more than merely a rejection of the authority of the professional-managerial class (who, for most working-class Americans, are more likely to have immediate power over their lives than CEOs), it’s also a protest against a class that they see as trying to monopolize for itself the means to live a life dedicated to anything other than material self-interest. Watching liberals express bewilderment that they thus seem to be acting against their own self-interest—by not accepting a few material scraps they are offered by Democratic candidates—presumably only makes matters worse.

David Graeber (2013), The Democracy Project: A History. A Crisis. A Movement., p123-125

Categories
links

link to June 2014

Categories
quotes

Make a friend of horror

wegowithstrength_clip

Michael Leunig, published in the Age. Click for the full cartoon. Let’s work so this isn’t true.

Categories
People I know sheffield

Fiddle tuition in Sheffield

Josie Wexler teaches fiddle around Sheffield and is highly recommended. She also drew this picture of a dragon for her website. Awesome!

3300514

Categories
quotes

Quote #298

I forgot that every little action of the common day makes or unmakes character, and that therefore what one has done in the secret chamber one has some day to cry aloud on the house-tops

Oscar Wilde, De Profundis, 1949.

Categories
idiocy

I’ve been listening to my tapes again

It’s now clear that CDs were a massive backwards move for personal music. My CDs are scratched, my CD players have conked out, one by one. I sit surrounded by dead storage media, while my tapes and tape players play as loud and clear as ever.

The popularity of low quality mp3s reveals the myth of fidelity that helped us buy into the CD hype. As with virtual reality, we let ourselves be fooled into believing that the primary thing that matters is high resolution (kbps, frames per second, pixels per inch, 3D, etc). CDs might have some sound quality edge over tape, but in terms of immersion quality is irrelevant. Fluidity of action drives immersion in VR. With music, the relationship we have to the production and consumption is primary; the history of obtaining, retaining, playing and enjoying.

With music, CDs accelerated us along that path that eroded music-as-object. This creates a vacuum in the emotional life of our music collections. The CD gives you shuffle, destroying the order the higher order of sequencing in favour of the individuality of tracks. You can skip in an instant, removing the distance tapes impose via effort of holding the forward key. CDs are fickle towards their digital memories, all too ready to give up to scratching, skipping or fatal “NO DISC” load failures. Frankly, less than 20 years after I bought my first CD, too many of them don’t f****ing work.

The tapes still work. I recognise my handwriting on the track listing, anticipate the start of each track from the end of the one that invariably came before. Certain artists are forever bound in my memory by accident of being taped onto opposite sites of the same tape. My hand knows the weight of a tape. Somewhere in my motor cortex a dedicated network of neurons store the pattern which allows me to stab STOP/EJECT, slip out a C90, spin it around between thumb and index finger, reinsert, slam shut holder and stab play, all within half a second.

Music-as-objects limits our choices. With a tape, if you want to skip more tracks you have to wait longer for the tape to wind forward. If you want to change your selection you need to stand up and find another tape you want to listen to. If you want to make a mix tape, you’ve only got 45 minutes a side, say, within which to do it.

The tape gives freedom through constraint in a way that is a release for anyone who has sat in front of Spotify, mouse over the search bar, thinking “a million million songs at my fingertips and I can’t think of anything I want to listen to”. Once, I could only listen to the music I had on tape (and a radio, without any pause or replay). Now I can spend 10 minutes listening to the first thirty seconds of 20 songs from a selection wider than the sky. It’s like a music diet consisting entirely of crisps.

Sometimes less is more.

Categories
psychology

ASMR: Don’t ask

A couple of years ago a nice man called Rhodri asked me about ASMR. I didn’t know anything about the phenomenon, but I was willing to comment as an experimental psychologist. The interesting thing to me was that this is a subjective experience that many people seemed to recognise, but it had no official name (until people started calling it ASMR and finding each other on the internet). “Could this be a real thing?” asked Rhodri. “Sure” I said, it’s perfectly possible that something could be real (common across people, not based on imaging or lies) and yet scientifically invisible. Maybe, I thought, now someone will look into this phenomenon and find ways of measuring it.

Since then, as far as I am aware, there hasn’t been any research on ASMR, but interest in the phenomenon grows and grows. I wrote a column about ASMR for the BBC. There’s even a wikipedia page, and yours truly is currently quoted near the top. Because of these I regularly have people with ASMR and assorted journalist types contacting me for my opinions on ASMR.

It makes me kind of sad to say, but I actually have no further opinions on ASMR. I don’t have anything extra to say than I said to Rhodri and in my column. I don’t follow the research on ASMR (if there is any now), and I have never done any research on ASMR. I only opened my big mouth in the first place because the thing that interests me is how subject experience is turned into social facts. As an experimental psychologist, that’s what I do and ASMR is an example of something that might be a real subjective experience that we can observe in the process of being turned into a socially accepted fact. That’s the thing that is interesting to me.

Regretfully, I have to refuse all opportunities to talk about ASMR itself because I literally have nothing more to say. Sorry.

Categories
quotes

Reason is no mere slave

“Human beings are not the perfectly rational creatures they would be if they strove for truth and consistency at all times. Nevertheless, if we can be motivated by a desire to eliminate inconsistency in our beliefs and actions, reason is no mere slave. We may use reason to enable us to satisfy our needs, but reason then develops its own motivating force”

Peter Singer (1981). The Expanding Circle: Ethics and Sociobiology, p. 143

Categories
quotes

On the epistemic costs of implicit bias

“…if you live in a society structured by racial categories that you disavow, either you must pay the epistemic cost of failing to encode certain sorts of base-rate or background information about cultural categories, or you must expend epistemic energy regulating the inevitable associations to which that information – encoded in ways to guarantee availability – gives rise”

Gendler, T. S. (2011). On the epistemic costs of implicit bias. Philosophical studies, 156(1), 33-63.

Categories
quotes

ur-quote on addiction and freewill

The craving for a drink in real dipsomaniacs, or for opium or chloral in those subjugated, is of a strength of which normal persons can form no conception. ‘Were a keg of rum in one corner of a room and were a cannon constantly discharging balls between me and it, I could not refrain from passing before that cannon in order to get the rum’; ‘If a bottle of brandy stood at one hand and the pit of hell yawned at the other, and I were convinced that I should be pushed in as sure as I took one glass, I could not refrain’: such statements abound in dipsomaniacs’ mouths.

William James, Principles of Psychology (New York: Henry Holt and Company, 1890), p. 543. Via Laurence. Thanks Laurence!

Categories
links

links for summer 2013

Categories
quotes

the extended self in interface design

As users become more familiar with an environment they situate themselves more profoundly. We believe that insights concerning the way agents become closely coupled with their environments have yet to be fully exploited in interface design

Hollan, J., Hutchins, E., & Kirsh, D. (2000). Distributed cognition: toward a new foundation for human-computer interaction research. ACM Transactions on Computer-Human Interaction (TOCHI), 7(2), 174-196.

Categories
science

Talking to journalists

Ed Yong has some excellent guidelines for scientists on giving comments to journalists, but I wanted to add a single piece of advice, one which will help whether you are talking to Ed or to less scrupulous journalists:

“Don’t be afraid to tell the journalist what the story is”

By this I mean you are allowed to not answer the question. This feels weird, since it violates conversational and academic rules, but the thing the journalist should be interested in is the real story. The questions just exist to get to that (which is why Ed says he often asks pretty vague questions). If you think the journalist is asking the wrong question, don’t answer it – tell them what the right question is.

If you restrict yourself to answering the wrong questions, the risk for everyone is that the (mistaken) framing stays in place, just with a few qualifications from you. For example, if the journalist is researching a study which says “fabulous brain training method boosts IQ” your comments that the study has flaws, or is a provisional result only, will lead to the headline “fabulous brain training method boosts IQ”. Or, if you are lucky, “fabulous brain training method might boost IQ”. And down in paragraph 4 will be some quote from you warning people not to get carried away.

Far better would be to give the journalist an alternative story, rather than some doubts. Tell them “no brain training method you can pay for works any better than free methods which are available to everyone”. Or “the brain is a machine which runs on blood, the best thing for your brain is physical exercise, not brain training”. This is news people can use. If you really disagree with a study, offering an alternative narrative is your best chance of that study being put in the correct context. “You don’t beat owt with nowt”, as they say.

This is what – I think – Ed is getting at when he says he wants the context from scientists, the “something interesting that I couldn’t have predicted”.

Further reading: George Lakoff “Don’t Think of an Elephant!: Know Your Values and Frame the Debate” (an actual book, so no hyperlink!)

Link: Ed Yong: “A Guide for Scientists on Giving Comments to Journalists

Categories
psychology

Cognitive Science Cinema

I’ve been trying to think of documentaries on cognitive science topics. This is what I’ve got so far. Can you help?

Categories
psychology science

Surely the hoo-har about replication could only concern a non-cumulative science?

There’s a hoo-har in psychology right now about replication. Spurred on by some high profile fraud cases, awareness of the structural biases surrounding publication and perennial rumblings about statistical malpractice, many are asking if the effects reported in the literature are real. There are some laudable projects aimed at improving best practice in science – journals of null results, pre-registration for experiments, the Center for Open Science (see previous link), but it occurs to me that all of this ignores an important bit of context. At the risk of stating the obvious: you need to build in support for replications only to the extent that these do not happen as part of normal practice.

Cumulative science inherently supports replication. For most of science, what counts on news is based on what has been done before – not just in an abstract theoretical sense, but in the sense that it relies on those results being true to make the experiments work. Since I’m a psychologist, and my greatest expertise is in my own work, I’ll give you an example from this recent paper. It’s a study of action learning, but we use a stimulus control technique from colour psychophysics (and by ‘we’, I really mean Martin, who did all the hard stuff). As part of preparing the experiment we replicated some results using stimuli of this type. Only because this work had been done (thanks Petroc!) could we design our experiment; and if this work didn’t replicate, we would have found out in the course of preparing for our study of action learning. Previously in my career I’ve had occasion to do direct replications, and I’ve almost always found the effect reported. I haven’t agreed with the interpretation of why the effect happens, or I’ve found that my beliefs about the effect from just reading the literature were wrong, but the effect has been there.

It is important that replication is possible, but I’ve been bemused that there has been such a noise about creating space for additional formal replications. It makes me wonder what people believe about psychology. If a field was one where news was made by collecting isolated interesting phenomena, then I there would be more need for structures to support formal replication. Should I take the reverse lesson from this – the extent to which people call for structures to support formal replication is evidence of the lack of cumulative science in psychology?

Categories
science

The infantilising power dynamic of public engagement with science

The rhetoric of wonder is all about encouraging participation. But this infantilising power dynamic is not conducive to confident involvement or critical inquiry.

Righteously snarky CiF, Prof Brian Cox: physicist or priest? Many popular scientists are atheist, so why are they so happy to use the misty-eyed language of religion? by
Eliane Glaser

Categories
Me psychology

Mea culpa musings (angry cyclist edition)

I screwed up. My latest column for BBC Future is about why cyclists enrage motorists. My argument is that cyclists offend the ‘moral order’ of the roads, evoking in motorists a feeling of outrage over perceived rule breaking.

Unfortunately, I included some loose words in my article that implied things I don’t believe and wasn’t arguing. Exhibit A:

Then along comes a cyclist, who seems to believe that the rules aren’t made for them, especially the ones that hop onto the pavement, run red lights, or go the wrong way down one-way streets.

This wrongly suggests both that I think the typical cyclists breaks the law (they don’t), and/or that motorists are enraged by cyclists’ law breaking. This is not the case, rather I am arguing that motorists are engaged by cyclists’ perceived rule breaking, where I mean rule in the sense of ‘convention’. Cyclists habitually, legally, and sensibly break conventions of car-driving such as waiting in queued traffic, moving at the speed limit or not under-taking.

Exhibit A has now been changed in the article to the more pleasing:

Then along come cyclists, innocently following what they see are the rules of the road, but doing things that drivers aren’t allowed to: overtaking queues of cars, moving at well below the speed limit or undertaking on the inside.

So, my bad and apologies for this. I should have been a lot clearer than I was. I’m just grateful that a few people understood what I was getting at (if you read the whole article I hope the correct interpretation is supported by the rest of the phrasing I use). The amount and vehemence of feedback has been quite surprising. Lots of people thought I was a frustrated driver who hated cyclists. In fact, the bike is my main form of transport. I’ve ridden nearly every day for over ten years (and been hit by a car once). For this article I was trying not to sound like the self-righteous cycling proto-fascist I feel like sometimes. I obviously succeeded. Perhaps too well.

Other people thought I was claiming that this was the only factor affecting road-user’s attitudes. I don’t think this. Obviously selective memory (for bad cyclists or drivers), in- group/out-group effects and the asymmetry in vulnerability all play a role. I did write a version of the article which laid out the conceptual space a bit clearer, but I decided it was boring to read, and really I wanted to talk about evolutionary game theory and make a novel – and, I thought, interesting – claim.

I sometimes think I should get “Telling the truth, just not the whole truth” translated into Latin so I can use it as the motto for the column. Each one I write someone comes back to me with something I missed out. If I tried to be comprehensive I’d end up with a textbook, instead of a 800 word magazine column. I don’t want to write textbooks, so I’m reasonably happy with leaving things out, but I do worry that there is a line you cross when telling some of the truth amounts to a deception or distortion of the whole truth. I’m trying, each time, not to cross that line. Feedback on how to manage this is welcome.

There were many other comments of all shades. You can ‘enjoy’ some of them on the BBC Future facebook page here. If you did leave a comment on email/facebook/twitter I’m sorry I couldn’t respond to all of them. I hope this post clarifies things a bit.

Categories
links

Links for January 2013

Categories
quotes

Quote #293

Work for 6 years. The 7th, go alone or among strangers, so the memory of your friends does not hinder you from being what you have become

Either Vinay, or via Vinay

Categories
quotes

Quote #292

I have not failed. I’ve just found 10,000 ways that won’t work.

Thomas Edison, attib.

Categories
psychology science

Bootstrap: corrected

So, previously on this blog (here, and here) I was playing around with the bootstrap as a way of testing if two samples are drawn from a different underlying distribution, by simulating samples with known differences and throwing different tests at the samples. The problem was that I was using the wrong bootstrap test. Tim was kind enough to look at what I’d done and point out that I should have concatenated my two sets of numbers and the pulled two samples from that set, calculated the mean difference and then used that statistic to constructed a probability distribution function against which I could compare my measured statistic (ie the difference of means) to perform a hypothesis test (viz. ‘what are the chances that I could have got this difference of means if the two distributions are not different?’). For people who prefer to think in code, the corrected bootstrap is at the end of this post.

Using the correct bootstrap method, this is what you get:

So what you can see is that, basically, the bootstrap is little improvement over the t-test. Perhaps a marginal amount. As Cosma pointed out, the ex-gaussian / reaction time distributions I’m using look pretty normal at lower sample sizes, so it isn’t too surprising that the t-test is robust. Using the median rather than the mean damages the sensitivity of the bootstrap (contra my previous, erroneous, results). My intuition is that the mean, as a statistic, is influenced by the whole distribution in a way the median isn’t, so it a better summary statistic (statisticians, you can tell me if this makes sense). The mean test is far more sensitive, but, as discussed previously, this is because it has an unacceptably high false alarm rate which is insufficiently penalised by d-prime.

Update: Cosma’s notes on the bootstrap are here and recommened if you want the fundamentals and are already degree-level comfortable with statistical theory.

Corrected boostrap function:

function H=bootstrap(s1,s2,samples,alpha,method)

difference=mean(s2)-mean(s1);

for i=1:samples
    
    sstar=[s1 s2];
    
    boot1=sstar(ceil(rand(1,length(s1))*length(sstar)));
    boot2=sstar(ceil(rand(1,length(s2))*length(sstar)));
    
    if method==1
        a(i)=mean(boot1)-mean(boot2);
    else
        a(i)=median(boot1)-median(boot2);    
    end
    
end

CI=prctile(a,[100*alpha/2,100*(1-alpha/2)]);

H = CI(1)>difference | CI(2)

		
Categories
books politics

More on Graeber’s Debt: The First 5,000 years

“The story of the origins of capitalism, then, is not the story of the gradual destruction of traditional communities by the impersonal power of the market. It is, rather, the story of how an economy of credit was converted into an economy of interest; of the gradual transformation of moral networks by the intrusion of the impersonal—and often vindictive—power of the state.” (p.332)

Our attitude to debt is a symptom of this erosion of social economies by currency economies. Mutually agreed, honour, credit is replaced by state-backed, economic credit. Loans which inexorably grow due to interest are enforced by brutal laws against debtors. This is the context for the rapacity of European colonialists – they were driven on by the tyranny of interest.

“All this helps explain why the church had been so uncompromising in its attitude toward usury. It was not just a philosophical question; it was a matter of moral rivalry. Money always has the potential to become a moral imperative unto itself. Allow it to expand and it can quickly become a morality so imperative that all others seem frivolous in comparison. For the debtor, the world is reduced to a collection of potential dangers, potential tools, and potential merchandise. Even human relations become a matter of cost-benefit calculation. Clearly, this is the way the conquistadors viewed the worlds they set out to conquer” (p. 319)

It is the secret scandal of capitalism that at no point has it been organized primarily around free labor. The conquest of the Americas began with mass enslavement, then gradually settled into various forms of debt peonage, African slavery, and “indentured service” (p.350)

This is a scandal not just because the system occasionally goes haywire, as it did in the Putumayo, but because it plays havoc with our most cherished assumptions about what capitalism really is—particularly that, in its basic nature, capitalism has something to do with freedom. For the capitalists, this means the freedom of the marketplace. For most workers, it means free labor. Marxists have questioned whether wage labor is ultimately free in any sense (since someone with nothing to sell but his or her body cannot in any sense be considered a genuinely free agent), but they still tend to assume that free wage labor is the basis of capitalism.

Our dominant image of the origins of capitalism continues to be the English workingman toiling in the factories of the industrial revolution, and this image can be traced forward to Silicon Valley, with a straight line in between. All those millions of slaves and serfs and coolies and debt peons disappear, or if we must speak of them, we write them off as temporary bumps along the road. Like sweatshops, this is assumed to be a stage that industrializing nations had to pass through, just as it is still assumed that all those millions of debt peons and contract laborers and sweatshop workers who still exist, often in the same places, will surely live to see their children become regular wage laborers with health insurance and pensions, and their children, doctors and lawyers and entrepreneurs.”(p351)

With this framing, Graeber repaints Adam Smith’s economic account – “It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.” etc – as a purely moral account, a utopia utterly unlike the actual economic conditions Smith lived in.

To understand the history of capitalism, however, we have to begin by realizing that the picture we have in our heads, of workers who dutifully punch the clock at 8:00 a.m. and receive regular remuneration every Friday, on the basis of a temporary contract that either party is free to break off at any time, began as a utopian vision, was only gradually put into effect even in England and North America, and has never, at any point, been the main way of organising the production for the market, ever, anywhere.
This is actually why Smith’s work is so important. He created the vision of an imaginary world almost entirely free of debt and credit, and therefore, free of guilt and sin; a world where men and women were free to simply calculate their interests in full knowledge that everything had been prearranged by God to ensure that it will serve the greater good. (p.354).

For some critical commentary see here: http://onthespiral.com/review-reactions-debt-first-years, the Crooked Timber seminar (ht Alex)

Update 30/12/12. There’s an important point about rights being conceptualised as property, which Gemma summarises well:

Our freedom is defined as a right, which we own, as opposed to Graeber’s view that rights are actually obligations on others (e.g. our right to free speech is actually others obligations to allow my free speech). Rights have been defined in this way to justify debt-peonage or even slavery – if we own our rights, like property, then we are free to give them away or even sell them (p206).

Categories
psychology science

Bootstrap update

Update: This post used an incorrect implementation of the bootstrap, so the conclusions don’t hold. See this correction

Mike suggested that I alter the variance of the underlying distibutions. This makes total sense, since it matches what we are usually trying to do in psychological research – detect a small difference in a lot of noise. So I made the underlying distibutions look a lot like reaction time distributions, with a 30ms difference between them. The code is

    t0=200;
    s1=t0+25*(randn(1,m)+exp(randn(1,m)));
    s2=t0+25*(randn(1,m)+exp(randn(1,m)))+d;

Where m is the sample size, and d is either 0 or 30. For a very large sample, the distributions look like this:

After a discussion with Jim I looked at the hit rate and false alarm rate separately. For the simple comparison of means, the false alarm rate stays around 0.5 (as you’d predict). For the other tests it drops to about 0.05. The simple comparison of means is so sensitive to a true difference, however, that the dprime can still be superior to that of the other tests. Which suggests dprime is not a good summary statistic to me, rather than that we should do testing simply by comparing the sample means.

So I rerun the procedure I described before, but with higher variance on the underlying samples.

The results are very similar. The bootstrap using the mean as the test statistic is worse than the t-test. The bootstrap using the median is clear superior. This surprises me. I had been told that the bootstrap was superior for nonparametric distributions. In this case it seems as if using the mean as a test statistic eliminates the potential superiority of bootstrapping.

This is still a work in progress, so I will investigate further and may have to update this conclusion as the story evolves.

Categories
books quotes

Debt: The first 5,000 years

David Graeber traces a line from Roman property law, through Cartesian dualism and Hobbes’ state of nature, to the foundational myth of the free market:

At this point we can finally see what’s really at stake in our peculiar habit of defining ourselves simultaneously as master and slave, reduplicating the most brutal aspects of the ancient household in our very concept of ourselves, as masters of our freedoms, or as owners of our very selves. It is the only way that we can imagine ourselves as completely isolated beings. There is a direct line from the new Roman conception of liberty – not as the ability to form mutual relationships with others, but as the kind of absolute power of “use and abuse” over the conquered chattel who make up the bulk of a wealthy Roman man’s household – to the strange fantasies of liberal philosophers like Hobbes, Locke, and Smith, about the origins of human society in some collection of thirty- or forty-year-old males who seem to have sprung from the earth fully formed, then have to decide whether to kill each other or begin to swap beaver pelts.

David Graeber (2011) ‘Debt: The First 5000 years’, p209-210.

Graeber uses an anthropologist’s view of history to argue that markets are brought into existence by the state, and particularly by an expansionist military state which wishes to force all social actors to be intermediaries in the war machine. By obliging everyone to accept state currency a state-coinage-slavery complex is created. This dynamic drives the creation of slaves, which are, by definition, people ripped from all social context. The collision of market economies with social economies (which are about interaction as much as obtaining goods) creates a moral dilemma which we can trace written in the texts of all the ancient religions (you’ll have to read the book for details). The dominant modes of human relation in historical time have been three: exchange, hierarchy and communism (not in the Marxist sense). The dominion of the exchange mode, and its perversion into being primarily market exchange, reduces the primacy of the other modes in the models of liberal/market thinkers, and so our conception of our selves (individually and politically) is contaminated by contradictory notions of debt and ownership (again, you’ll have to read the book). Ultimately this finds expression in a vision of ourselves as separate from our own bodies, and in the foundational myth of economics in which we markets come into being de novo among an asocial but equal status collection of isolates who can begin to trade to satisfy their wants.

It’s an extremely rich book, which is also very disorganised in its arguments. I’m still digesting what I’ve read so this is a poor summary. Most importantly for me, and separate from the specifics of the argument, the anthropological and historical material does the job of expanding our conception of what we and our society could be.

Pro-tip: on the final pages (p384-387) Graeber offers his own summary of the thesis of the book.

Categories
science

Testing bootstrapping

Update: This post used an incorrect implementation of the bootstrap, so the conclusions don’t hold. See this correction

This surprised me. I decided to try out bootstrapping as a method of testing if two sets of numbers are drawn from different distributions. I did this by generating sets of numbers of size m from two ex-gaussian distributions which are identical except for a fixed difference, d

    s1=randn(1,m)+exp(randn(1,m));
    s2=randn(1,m)+exp(randn(1,m))+d;

All code is matlab. Sorry about that.

Then, for each pair of numbers I apply a series of different tests for if the distributions are different.
1. Standard t-test (0.05 significance level)
2. Is the mean(s1) 3. Bootstrapping using mean as the test statistic (0.05 significance level)
4. Bootstrapping using the median as the test statistic (0.05 significance level)

I used Ione Fine’s pages on bootstrapping as a guide. The bootstrapping code is:

function H=bootstrap(s1,s2,samples,alpha,method)

for i=1:samples
    
    boot1=s1(ceil(rand(1,length(s1))*length(s1)));
    boot2=s2(ceil(rand(1,length(s2))*length(s2)));
    
    if method==1
        a(i)=mean(boot1)-mean(boot2);
    else
        a(i)=median(boot1)-median(boot2);    
    end
    
end

CI=prctile(a,[100*alpha/2,100*(1-alpha/2)]);

H = CI(1)>0 | CI(2)<0;

I do that 5000 times for each difference, d, and each sample size, m. Then I take the average answer from each test (where 1 is 'conclude there distributions are different' and 0 is 'don't conclude the distributions are different'). For the case where d > 0 this gives you a hit rate, the likelihood that the test will tell you there is a difference when there is a difference. For d = 0.5 you get a difference that most of the tests can detect the majority of the time as long as the sample is more than 50. For the case where d = 0, you can calculate the false alarm rate for each test (at each sample size).

From these you can calculate d-prime as a standard index of sensitivity and plot the result. Sttest, Smean, Sbootstrap and Sbootstrap2 are matrices which hold the likelihood of the four tests giving a positive answer for each sample size (columns) for two differences, 0 and 0.5 (the rows):

figure(1);clf
plot(measures,norminv(Sttest(2,:))-norminv(Sttest(1,:),0,1),'k')
hold on
plot(measures,norminv(Smean(2,:))-norminv(Smean(1,:)),'r')
%plot(measures,norminv(Smedian(2,:))-norminv(Smedian(1,:)),'c--')
plot(measures,norminv(Sbootstrap(2,:))-norminv(Sbootstrap(1,:)),'m')
plot(measures,norminv(Sbootstrap2(2,:))-norminv(Sbootstrap2(1,:)),'g')
xlabel('Sample size')
ylabel('sensitivity - d prime')
legend('T-test','mean','bstrap-mean','bstrap-median')

Here is the result (click for larger):

What surprised me was:

  • The t-test is more sensitive than the bootstrap, if the mean is used as the test statistic
  • How much more sensitive the bootstrap is than the other tests if the median is used as the test statistic
  • How well the simple mean does. I suspect there's so nuance I'm missing here, such as unacceptably high false positive rate for smaller differences

Update 28/11/12
-Fixed an inconsequential bug in the dprime calculation
-Closer inspection shows that the simple mean case gives a ~50% false alarm rate, but the high sensitivity offsets this. Suggests dprime isn't a wise summary statistic?

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links

Links for autumn 2012

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academic Me

New academic website

I have made myself a new website for my day job. I used wordpress, and it was fantastically convenient. I’m also pretty happy with how it looks. Feedback welcome.

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academic

Notes for undergraduates

This has been in my email signature for the last year or so.

If you email me, please say your full name, level and, if relevant, which course(s) you are referring to. Although you know what “the lecture” or “the coursework” refers to, I may not. If you refer to an article, book or a webpage, please give the full reference and/or URL so that I know what you are talking about. Similarly, if you include a citation (surname, date) in a piece of writing, please include the full reference (in APA style) at the end.

It is important that you leave the University of Sheffield in the habit of writing formally to people. I may not be bothered by you not including an introduction to your email, or by you not signing it, but many people you write to will be. You should also make an effort to capitalise, punctuate and spell correctly in your email. Again, although I may not judge you negatively if you fail to do this, many people will, so you should practice the habit of taking care over these things when you write.

If you are a PSY241 student, please read this before emailing me
http://psy241.group.shef.ac.uk/psy241wiki/index.php/FAQ

If you need a response by a particular time, it helps if you mention this in the email. If you have an urgent query (i.e. requires a response within 48 hours) email is not appropriate. Please call instead.

I do not read my email over the weekend, or after 5pm.

Answers to most of the questions I get asked are readily available, either in the Undergraduate Handbook or on the Departmental or University webpages. If you write to me with a question like this I will probably write back and ask you where you have looked already for the information. If you want to avoid this, please say in your email how you tried searching for the information you required before emailing me.

If we make an appointment to meet you must turn up on time. If you are late I may not be able to begin a meeting with you because it will infringe on other commitments. If you are unable to make an appointment, or are going to be late, please call to let me know, so that I am able to do other things with my time and am not waiting around like a lemon.

Finally, congratulations on reading this far. Here’s some good advice: “The way to get a first class mark is to answer a specific question by making arguments about theories and supporting those arguments with evidence”. Even if you aren’t aiming for a first class mark, you can still avoid getting a lower mark than you should by ensuring that you answer the question. We cannot give you marks for providing correct information which does not answer the question.

Bonus advice for 2012: If you want to get answers from busy people, ask simple direct questions. “Is today’s lecture at 12 o’clock?” is better than “When are the lectures?”, and may be more in line with what you really want to know anyway. Both of these options are better than something like “What do I need to know about the course?” which is so poorly specified that you are unlikely to get a swift and helpful answer.

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psychology quotes

Quote #291: Sutherland on Consciousness

Consciousness is a fascinating but elusive phenomenon; it is impossible to specify what it is, what it does, or why it evolved. Nothing worth reading has been written on it.

Stuart Sutherland, in The International Dictionary of Psychology entry on Consciousness