Can playing video games improve general cognitive function?

UnknownThere’s been a lot of discussion this week about a new article in Nature by Anguera et al. titled “Video game training enhances cognitive control in older adults”. This paper appears to demonstrate what a lot of brain training programs promise, but few seem to deliver; genuine cognitive benefits that generalised to additional untrained cognitive domains/abilities, in older adults.

The positive effects seen are quite large, and as such, the results appear to be quite promising. There are still some reasons for scepticism though. Firstly, this result stands in contrast to other research which shows no effect of similar training programs (including another study by Adrian Owen et al., also published in Nature a few years ago). Secondly, the number of subjects in this study is pretty small, with only 15 per group. As Button et al. (2013)  have pointed out recently, small sample sizes can lead to an inflation of the estimates of effect sizes.

There are several other issues with the paper, but they have been most ably covered by others, notably Christian Jarrett on the BPS Research Digest, and Daniel Simons on his own blog, so I encourage interested readers to go and check out those sources rather than repeat them here. It would be wonderful if such a simple intervention could halt or slow cognitive decline in older adults, however (as usual) more work is needed with larger groups of people before we’ll know for sure if that’s the case.

A short video from Nature that explains the study is embedded below:

More eye-wateringly egregious neuromarketing bullshit from Martin Lindstrom

Martin Lindstrom is a branding consultant, marketing author, and (possibly because that wasn’t quite provoking enough of a violently hateful reaction in people) also apparently on a one-man mission to bring neuroscience into disrepute. He’s the genius behind the article in the New York Times in 2011 (‘You love your iPhone. Literally’) which interpreted activity in the insular cortex (one of the most commonly active areas in a very wide variety of tasks and situations) with genuine ‘love’ for iPhones. This was a stunningly disingenuous and simple-minded example of reverse inference and was universally derided by every serious commentator, and many of the more habitually rigour-phobic ones as well.

Unfortunately, it appears his reputation as a massive bull-shitting neuro-hack hasn’t quite crossed over from the neuroscience community into the mainstream, as I realised this weekend when I settled down to watch The Greatest Movie Ever SoldMorgan Spurlock’s documentary about branding, product placement and the general weirdness of the advertising world is generally excellent, however, it unfortunately makes the mistake of wheeling on Lindstrom for a segment on neuromarketing. You can see his piece from the movie in the video below:

Lindstrom conducts a fMRI scan with Spurlock as the subject, and exposes him to a variety of advertisments in the scanner. Fair enough, so far. Then however, Lindstrom explains the results using a big-screen in his office. The results they discuss were apparently in response to a Coke commercial. According to Lindstrom the activation here shows that he was “highly engaged” with the stimulus, and furthermore was so “emotionally engaged” that the amygdala which is responsible for “fear, and the release of dopamine” responded. Lindstrom then has no problem in making a further logical leap and saying “this is addiction”.

Screen Shot 2013-08-11 at 22.01.26

Needless to say, I have a somewhat different interpretation. Even from the shitty low-res screenshot grabbed from the video and inserted above I can tell a few things; primarily that Lindstrom’s pants are most definitely on fire. Firstly (and least interestingly) Lindstrom uses FSL for his fMRI analysis, but is using the crappy default results display. Learning to use FSLView would look much more impressive Martin! Secondly, from the very extensive activity in the occipital lobe (and elsewhere), I’m able to pretty firmly deduce that this experiment was poorly controlled. fMRI experiments rely on the method of subtraction, meaning that you have two close-but-not-identical stimuli, and you subtract brain activity related to one from the other. As in this case, say that you’re interested in the brain response to a Coca-Cola commercial. An appropriate control stimulus might therefore be, say, a Pepsi commercial, or even better, the Coke commercial digitally manipulated to include a Pepsi bottle rather than a Coke one. Then you subtract the ‘Pepsi’ scan from the ‘Coke’ scan, and what you’re left with is brain activity that is uniquely related to Coke. All the low-level elements of the two stimuli (brightness, colour, whatever) are the same, so subtracting one from the other leaves you with zero. If you just show someone the Coke advert and compare it to a resting baseline (i.e. doing nothing, no stimulus) you’ll get massive blobs of activity in the visual cortex and a lot of other places, but these results will be non-specific and not tell you anything about Coke – the occipital lobe will respond to absolutely any visual stimulus.

By the very widespread activity evident in the brain maps above, it appears that this is exactly what Lindstrom has done here – compared the Coke advert to a resting baseline. This means the results are pretty much meaningless. I can even make a good stab at why he did it this way – because if he’d done it properly, he’d have got no results at all from a single subject. fMRI is statistically noisy, and getting reliable results from a single subject is possible, but not easy. Gaming the experiment by comparing active stimuli to nothing is one way of ensuring that you get lots of impressive-looking activation clusters, that you can then use to spin any interpretation you want.

fMRI is a marvellous, transformative technology and is currently changing the way we view ourselves and the world. Mis-use of it by opportunistic, half-educated jokers like Lindstrom impoverishes us all.

Neuromarketing gets a neurospanking

A brief post today just to point you towards a couple of recent articles which pull down the pants of the neuromarketing business and give it a thorough neurospanking (© @psychusup).

The first one is a Q&A with Sally Satel, one of the authors of the recently-published and pretty well-received book Brainwashed. Sally makes some good points about ‘neuroredundancy’ – that brain scan experiments often don’t really tell you anything you don’t already know. Read it here. There’s also a good article on Bloomberg by Sally and Scott Lillienfield here.

The other one is an article at by associate-of-this-parish Matt Wall, which focuses particularly on a recent trend in neuromarketing circles – the use of cheap ‘n’ nasty EEG equipment and (potentially) dodgy analysis methods in order to generate  sciencey-looking, but probably fairly meaningless results. Read that one here.

That’s all for now – I’ll be back with a proper post soon(ish).

A brief experiment for Tappers

Yeah, I'm a Stargate fan. What of it? That Sanctuary thing was dreadful though.

Yeah, I’m a Stargate fan. What of it? That Sanctuary thing was dreadful though.

This one’s for all the tappers out there – people who believe in invisible energy meridians that are distributed throughout the body, and that stimulating the end-points of them can lead to positive effects. My contention is that tapping actually has no effect at all on the body’s energy meridians, because the body doesn’t have energy meridians; they don’t exist. My alternative hypothesis is that the simple act of tapping while reciting tapping ‘scripts’ may simple serve to distract you from the issue at hand.

I want to propose a little experiment to test this. The next time you feel the urge to tap, do some ‘sham’ tapping instead. What I mean is, do some tapping that shouldn’t work. I notice that none of these diagrams of tapping points feature any points below the waist*, so tap yourself on the leg instead. While doing that, recite something else, rather than your normal tapping script. Anything you like; a nice poem, your shopping list, whatever. For extra nerd-cred points you could try the Bene Gesserit litany against fear. If I’m right, and it’s the simple act of performing the ritual which is responsible for the (putative) effects, then this routine should be as effective as your normal one.

Of course, this is a highly unscientific experiment in lots of ways. Ideally we’d have a large group of people, subject half of them to a course of ‘real’ tapping and the other half to a course of ‘sham’ tapping, and then look at the different effects. Crucially, the people would be ‘blind’, in that they wouldn’t know anything about tapping or what the hypotheses and aims of the experiment were. If you’re already a committed tapper, you’re probably fairly invested in believing that tapping works, and as a corollary, are perhaps unlikely to be fully invested in my ‘sham’ tapping protocol. Nevertheless, humour me, and give it a go with an open mind. I’d be very interested to hear your impressions.

*Although there’s one obvious bodily end-point to stimulate down there… HUUUURRRRR.

Paging Susan Greenfield: South Korea has made up a new problem – ‘Digital Dementia’

my-brain-hurtsA slew of bullshit news pieces has hit the interwebz in the last couple of days, driven by a couple of articles in the usual rigour-phobic press sources. They focus on a South Korean report which claims to identify a syndrome known as ‘Digital Dementia’ in some young people. This syndrome, it’s claimed, is characterised by a deterioration in cognitive abilities brought about by over-use of digital devices.

The Telegraph reports on it here, the Daily Fail here, and Fox News have a video report here.

The fact that ‘Digital Dementia’ seems to be a condition that’s just been made-up for the purposes of the report, and no-one actually seems able to describe what it is in any precise terms doesn’t dim the enthusiasm of these news sources at all, naturally.

As if that wasn’t bad enough, a widely-circulated quote from Dr Byun Gi-won, (of the Balance Brain Centre in Seoul), goes:

“Over-use of smartphones and game devices hampers the balanced development of the brain. Heavy users are likely to develop the left side of their brains, leaving the right side untapped or underdeveloped,”

Players of Neurobollocks-bingo can put a big cross on the ‘Left/Right brain neuromyth’ section of their score-card, then.

I can’t find any further mention on the internet of a) Dr Byun Gi-Won, b) this Balance Brain centre in Seoul, or c) the actual report that these news stories are based on. I might be missing something, so if any readers do manage to track down any information related to any of those things, please let me know in the comments. In the meantime, just file this one under ‘bullshit irresponsible scaremongering, with a laughably transparent veneer of made-up neuroscience’ and move on.

Further thoughts on EFT – Tapping as a safety behaviour?

CBT_Anxiety_TreatmentI’ve written before about the Emotional Freedom Technique and Tapping; a pretty ridiculous-looking form of therapy that involves tapping oneself on the face and body in order to stimulate the end-points of ‘energy meridians’. It’s clear that this is essentially bogus, for the blank and uncontroversial reason that such energy meridians in the body simply don’t exist.

However, it’s possible that people derive some benefit from tapping/EFT, even though the mechanism behind it is bunk. The internet is awash with people who claim to have had extremely positive experiences with all kinds of things, including reiki, homeopathy, acupuncture, any of the various kinds of energy healing, and a whole host of other new-age touchy-feely alternative-medicine approaches; all of which have been determined to be basically ineffective in controlled trials. The positive experiences that people have with these things can be fairly safely attributed to some combination of the placebo effect and regression-to-the-mean. Most likely the same is true for those who derive some benefit from EFT/tapping.

So far, so uncontroversial. In this view, tapping is basically harmless and the only people suffering from it are people who willingly pay money for bogus therapies. However, I want to make an alternative suggestion; in people who tap for issues related to anxiety, tapping might actually be harmful, because it might come to be a safety behaviour.

Safety behaviours are well-studied characteristics of anxiety disorders, and the Cognitive Behaviour Therapy (CBT) literature has many examples. This article explains them pretty well, but briefly, a safety behaviour is something that prevents engagement and exposure to the anxiety-provoking stimulus. For example, imagine someone who experiences panic attacks on trains, but  needs to take a train on their daily commute to work. One way of coping with this issue would be to simply get off the train at the next stop when the anxiety started to increase. A good CBT therapist doing exposure-therapy with this patient would instead recommend that they remain on the train and cope with their anxiety in other ways; this exposure to the feared situation, and the experience of being there and not having a panic attack (or having one, but then feeling the anxiety gradually decrease again) is the cornerstone of exposure therapy, and a very powerful weapon in the CBT therapists arsenal. In short then, safety behaviours are unhelpful in that they prevent exposure to the feared situation; they’re seductive, in that they reduce anxiety in the short term (by getting off the train, the situation is resolved and the panic attack doesn’t happen) but maintain, and perhaps even strengthen the association between a feared-situation and anxiety in the long-term. Some patients require many hours of therapy and exercises in order to reduce their safety behaviours, and this is generally a helpful process.

Tapping appears to be used a lot for anxiety relief, as this video (and many other videos/sites) suggests. My thought about tapping for anxiety then is, what if tapping becomes a safety behaviour? Tapping in an anxiety-provoking situation might serve to reduce the anxiety just because of simple distractibility. In fact it may be the spoken or sub-vocalised ‘scripts’ that accompany tapping that are more effective; something recognised by many previous authors. Unfortunately, this might have the effect of preventing the full exposure to a feared situation that is necessary to  learn that the fear will eventually reduce, and that the situation can be coped with. Just as for other safety behaviours, tapping might well be beneficial and highly reinforcing in the short-term (i.e. it reduces the anxiety) but harmful in the longer term. Some safety behaviours can be highly dysfunctional and, once entrenched, very difficult to eliminate.

Neuroleadership – lots of old-fashioned psychology, very little neuroscience


Happening right now (19th-21st of June) in Sydney is the 2013 Asia-Pacific Neuroleadership Summit, organised by the Neuroleadership Institute. There are two other summits happening this year, one in London and another in Washington, and the summits have been running annually since 2007. Neuroleadership appears to be a ‘thing’ then, but what is it exactly? The term was apparently first coined by David Rock in this 2006 article in the magazine ‘Strategy+Business’. According to the front page of the institute’s website, neuroleadership is:

“Neuroleadership is an emerging field of study connecting neuroscientific knowledge with the fields of leadership development, management training, change management, consulting and coaching.”

Sounds fairly reasonable. Unfortunately, the amount of genuine applied neuroscience involved appears to be very little, and in fact the focus appears to be more on fairly standard psychology concepts that have been knocking around for years, if not decades. The program for the summit focuses on concepts like cognitive biases, social psychology, stress management, ‘wisdom’, and managing performance. These all strike me as being psychological phenomena, and very amenable to investigation and explanation at a psychological, rather than neuroscientific, level. And in fact, organisational and business psychologists have been doing that for some time. Reading through more detailed highlights of last year’s (2012) summit also reveals little mention of neuroscience, and lots more fairly standard applications of psychological concepts.

I’ve been pretty much unable to find any genuine pieces of research related to neuroleadership either; a Google Scholar search on ‘neuroleadership’ turns up lots of opinion-type pieces, but nothing of any real substance.

There are some serious neuroscientists involved with the neuroleadership institute. One of them is Matt Lieberman, a professor at UCLA, and, by any reasonable measure, an outstanding scientist. I was genuinely a big fan of Matt’s work during my PhD and while my changing research interests mean I haven’t followed his more recent work as closely, I have a great deal of respect for him. Interestingly, I found a draft of a paper by Matt (and Naomi Eisenberger, another faculty member at UCLA) which you can view here (PDF). The paper discusses business scenarios from the point of view of social cognitive neuroscience, but again, the (very simplified) neuroscience in the paper seems to be more of an adjunct, or add-on to the main message, which is that attention needs to be paid to the social and emotional needs of workers, in order to maximise their performance and job satisfaction. This doesn’t seem particularly ground-breaking, and makes me wonder what precisely neuroscience is adding to the issue. Prof. Lieberman’s due to speak at all three neuroleadership summits this year, and is on the advisory board of the institute. Maybe he just likes some free trips around the world every year.*

If one was feeling magnanimous, the field of neuroleadership could be described as an emerging discipline with lofty ambitions, but one that has yet to really define its remit and fully understand its limitations. A more cynical evaluator could characterise it as a gosh-darn whizzo wheeze to re-package some tired old concepts from 1980s organisational psychology textbooks and make them all shiny and new by sticking ‘neuro’ on the front and having lots of pictures of CGI brains in your presentations. Regular readers will know that a surfeit of magnanimity is not something I tend to suffer from.

It’s hard to get too splenetic about neuroleadership. It may be bullshit, but it’s not clinics ripping off parents with therapies that don’t work or people doing unnecessary SPECT scans on kids. Ultimately, it’s one set of business people selling some bollocks to another set; all they’re really doing is wasting their own time and effort.

*And honestly, who can blame him? Academic life has few enough perks. Seriously; good luck to him.

Prism Brain Mapping

286-1Prism Brain Mapping is an online assessment package that promises… Well… it promises all kind of things, from “Enhanced selling skills” to “Developing female leaders” to 360 degree assessments”, whatever the hell that’s supposed to mean. It appears to be a pretty big deal, with practitioners all around the world and a certification program for new ‘practitioners’.

So, what is it? It’s basically a re-packaging of some old psychometric tests with a neuroscience-y sounding spin. Or in their words:

“It represents a simple, yet comprehensive, synthesis of research by some of the world’s leading neuroscientists into how the human brain works, and why people, who have similar backgrounds, intelligence, experience, skills, and knowledge, behave in very different ways. The instrument’s graphical representation of the human brain serves, not only to remind people of its biological basis, but also to help demonstrate the equally valuable merits of specific cerebral modes.”

The central idea seems to be to divide the brain up into four colour-coded segments, like so:


…and then produce a matching colour-coded report that divides the responses up into several behavioural domains:


Quite what those four domains have to do with the colour-coded segments of the brain is never really made clear. Of course, this is just another version of the hoary old left/right brain neuromyth. Needless to say, it also has nothing whatsoever to do with ‘brain mapping’ in any even vaguely-meaningful sense.

Prism also provides an exhaustive 42-page ‘Professional report’ (sample version here) that incorporates all kinds of psychometric-type measures, including emotional intelligence, the ‘Big Five‘ personality traits, and ‘Mental toughness’ as well as their custom (i.e. made-up) colour-coded profiles. The whole site is awash with neurobollocks, particularly their “Science behind Prism” page which basically waffles ‘Because: BRAINS!’ for 1500 words.

I got curious about who was behind this. The ideas behind it are utter drivel, but the implementation is actually fairly sophisticated, and they’ve certainly done their homework on the brain stuff. There are no names at all on the site, and that only made me even more curious; however, one of their promotional leaflets mentions something called the Center for Applied Neuroscience. A quick whois look-up on that domain reveals it was registered by someone called Charles De Garston who (from his LinkedIn profile) is the owner of another business named Team Dynamics International. Also heavily involved in Prism is Lisa De Garston, who runs a Prism-related group on LinkedIn.  Neither of these two seem to have any (higher) academic qualifications at all, let alone any in neuroscience or psychology. The only other name I can identify who’s involved is Andrew Sillitoe, who runs a coaching/leadership/consultancy/pointing-out-the-bleedin’-obvious business called Managing the Mist.

So, a good example of an apparently successful business built on a slippery foundation of the most reekingly odious  effluent. I’m pretty much in awe of their audacity to be honest; they’ve spent a great deal of time researching this stuff and coming up with something that’s just plausible enough for an uninformed audience to swallow, and their implementation is highly professional and very slick. I almost feel like cheering them on, but that doesn’t change the fact that you’d get about as much insight into ‘brain mapping’ from holding an actual glass prism up to your ear than from doing these online psychometric tests.

Prism Brain Mapping was previously the subject of a brief post by NeuroSkeptic, which is (of course) worth a read. Also, many thanks to Amy Brann who brought it to my attention on Twitter.

How to develop and market your neuro-product


You were only supposed to blow the bloody occipital cortex off.

The human brain is fast becoming a new frontier for business. Neuromarketing, ‘brain-training’ companies, and therapeutic programs that contain some kind of neuro-twist are proliferating at a very high rate.  Somewhat more disconcertingly, a couple of new products actually aim to make a more direct interface with your brain. ‘Melon’ (currently getting funded on KickStarter) is a headband that measures your EEG signal in order to help maintaining focus on tasks, and a company called is currently marketing a trans-cranial Direct Current Stimulation (tDCS) device that claims to directly modulate brain activity in the frontal lobes by the use of electric currents. In case you’re wondering about that last one, then yes, it’s absolutely as terrifying and ill-advised as it sounds. At the other end of the scariness/lunacy/class-action-lawsuit-waiting-to-happen scale are relatively harmless products like ‘Neuro’ energy drinks, or Neurozan dietary supplements.

So, neuro-business is definitely becoming a thing, and it’s a safe bet that we can expect to see many more products of this type in the future. But there’s a problem: the neuroscientists. Those slightly weird, often scruffily dressed, usually somewhat nerdy people who spend their time in basement labs and only occasionally emerge blinking into the sunlight to pour buckets of cold cerebrospinal fluid over perfectly legitimate business ideas and marketing campaigns. “Where’s the evidence?” they whine, mostly to other neuroscientists on Twitter, or on blogs like this one that no-one else reads. “Show us the data” and “Does it really work?” they screech, incessantly.

So, maybe you’ve got an idea for a hot new brain-mangling device, or a new twist on the brain training band-wagon. Maybe you’ve even got a new therapy technique that you’ve lovingly crafted over years of working with special-needs children, that you genuinely believe could make a profound and lasting difference to people’s lives, and that you’re just itching to share with the world. That’s great! But what can you do to ensure you’re not harassed by hordes of killjoy brain-botherers as you develop and market your product? Presented below is a handy guide to doing neuro-product-development the right way. Follow this simple process, and grateful, happy customers will be throwing big piles of cash at you before you can say ‘rostral orbito-frontal para-cingulate gyrus’.

1. Evaluate your product. Really evaluate it.
This is the big one. This is the Manhattan Project, the Everest, the Moon-shot, the X prize. I’m not going to lie to you; it’s not going to be easy, or fast, or cheap, but if you’ve got a product that you really believe in, don’t you owe it to your investors and customers to do everything you can to show that it works? Of course you do.

What you need to do in most cases is conduct a Randomised Controlled Trial (RCT) of your product. The ‘randomised’ bit means that participants are assigned to each group at random and the ‘controlled’ bit indicates that typically a product or treatment is compared against a placebo, or sometimes against an existing active product (both can be ‘control’ conditions). The trial should be well-powered (meaning it should have an adequate number of people in it to be able to demonstrate the hypothesised effect) and ideally double-blinded (meaning that neither the participants, nor those administering the tests, should know whether they are in the ‘active’ or ‘placebo’ groups).

Running a well-conducted RCT is not a trivial task; fortunately help is available. Contract Research Organisations (CROs) will run the trial for you. This is certainly the fastest way of getting it done, but probably also the most expensive. Another way might be to find a friendly academic who works in a research field related to your product, and get them to do it for you. Many academics are desperate for cash and would be only too happy to get some industry funding to run a research project. You may need to stump up enough money to employ a research assistant for the duration of the project, it might take some time, and they’re unlikely to be quite as professional about it as the CROs, but they definitely have the skills and experience needed to do a good job. This also has the added benefit of being an (at least nominally) independent evaluation; for added scientific credibility points you could even sponsor studies at more than one academic institution, using different participant samples, in different locations.

2. Make the results public
What’s the point of conducting a fantastic piece of research if nobody ever knows about it? You need to publish your findings in a peer-reviewed scientific journal. If you’re doing it in collaboration with academics, they’ll definitely want to do this anyway, so it’s a win-win for all concerned. Ideally, you would also make all the raw data from the trial available and freely-downloadable from your website; that way you can get further (free!) verification of your results from data-nerds who like playing with that kind of thing.

3. Market it on the basis of your data
So you’ve done the testing, you’ve published the results; you’re ready to go! I know it’s probably all very exciting at this point, but you need to take a couple of deep breaths and tread carefully. All the hard work you’ve put into testing your product will be a waste of effort if you don’t stick closely to the results in your marketing. Don’t make wild claims about the product’s effectiveness that aren’t supported by the data. Don’t claim that it’s effective in treating say, autism, when you’ve only actually tested it on an ADHD population. Don’t say that it can boost performance in healthy people when you’ve only tested it on a patient group. Any claims you make that go beyond what you can actually prove will only hurt you in the long run, and will bring down the wrath of the neuro-nerds.

This approach might seem laborious; it’s the kind of procedure that pharmaceutical companies have to go through when making licensing applications to the FDA for new drugs. Neuro-products are lightly regulated at the moment because it’s very new, so there’s no legal obligation to do anything. However, if some of them really can change the brain in a meaningful way, shouldn’t they be held to the same standard as psychoactive drugs? At least there’s a moral obligation there, if not (yet) a legal one.

Doing due diligence in terms of product evaluation also serves to mitigate what I like to call the penis enlargement problem. For the sake of argument, let’s suppose that someone has invented a treatment that can genuinely enlarge penises. This hypothetical treatment is safe, effective, and works in 100% of men. Unfortunately, no-one will ever know about it, because of the enormous number of bogus penis-enlargement treatments that are promoted in spam emails and pop-up ads all over the internet. Proving your product is effective in the most rigorous way possible, and freely publishing the results and the data is the most effective way of differentiating your business from the hordes of phony neuro-products (of which there are many) out there.

Alternatively, if this all seems like too much of a bother, you can just re-cycle some old therapy techniques using new jargon, or bolt together some old academic research with a piece of new technology. Hire someone to make a really slick website, stick some fake customer testimonials up there and start selling a product that doesn’t really work, and may even actually be dangerous. You won’t be alone; that’s pretty much what everyone else is doing at the moment.

A handy flow-chart to illustrate the simple 3-step process of neuro-product development.

A handy flow-chart to illustrate the simple 3-step process of neuro-product development.

Why learning styles don’t exist, by Daniel Willingham

Many educators have encountered the concept of ‘Learning styles‘; the idea that some people learn more easily through one sensory modality (e.g. visual, auditory) while others more easily pick up information through another. This is a surprisingly pervasive idea in education circles, and one for which there is very little evidence.

Daniel Willingham (also on twitter: @DTWillingham) is a psychology professor who’s written several excellent pieces debunking this particular myth. An article in Change magazine can be found here and his excellent Learning Styles FAQ is available on his own website here.

He also made a really marvellous video that sets out his arguments very clearly. Essentially Prof Willingham has said everything that needs to be said on the topic, so I’ll shut up about it and let you watch the video. Enjoy: