Tourette syndrome

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The term “involuntary” used to describe Tourette syndrome tics is a source of confusion since it is known that most people with TS do have some control over the symptoms. Before tic onset, individuals with TS experience what is called a “premonitory urge,” similar to the feeling that precedes yawning.

What is recognized is that the control which can be exerted from seconds to hours at a time may merely postpone and exacerbate outbursts of symptoms. Tics are experienced as irresistible as a yawn and must eventually be expressed. People with TS often seek a secluded spot to release their symptoms after delaying them in school or at work.

Typically, tics increase as a result of tension or stress (but are not solely caused by stress) and decrease with relaxation or concentration on an absorbing task. In fact, neurologist and writer Oliver Sacks has described a man with severe TS who is both a pilot and a surgeon.

Fascinating section from the Wikipedia article on Tourette syndrome.

Link to Tourette Syndrome Association (UK).

Susan Greenfield in conversation

susan_greenfield.jpgABC Radio’s Science Show hosts a wide-ranging and engaging conversation with neuroscientist Susan Greenfield, where she discusses the latest scientific and ethical implications of brain science.

Professor Greenfield is constantly involved in drawing out science from the sometimes stuffy world of academia into the public eye and is one of the liveliest figures in contemporary neuroscience (I still have fond memories of her presenting the Christmas Lectures in a red leather cat suit).

She also has an extensive knowledge of philosophy and history, meaning she often has a different perspective from other researchers in the field.

mp3 or realaudio of Susan Greenfield at the Sydney Writers’ Festival.
Link to transcript of programme.

Autism Diva

autism_diva.jpgAutism Diva is the name of an author who comments on the science and politics of autism. On her blog she maintains a distinctly positive view of the condition, is unashamedly critical of many mainstream views and keeps tabs on the developments in the research world.

She presumably has an autistic spectrum diagnosis herself and certainly has a child with autism. The blog is far from a dispassionate analysis but is an engaging example of the thoughtful activism being promoted by a growing number of the autistic community.

One part of the blog, Autism Diva’s profile page, reminded me of the wonderfully straightforward way of communication that many people with autism prefer and made me laugh out loud:

About Me
Autism Diva loves the truth.

Interests
autism, the truth

Link to Autism Diva’s blog.
Link to Wikipedia article on autism.

The madness of James Tilly Matthews

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A psychoanalyst once proposed that ‘madness is when you can’t find anyone who can stand you’. This is not such a flippant definition as it might first appear. In practice, the mad are created when those around them can no longer cope with them, and turn them over to specialists and professionals. They are people who have broken the ties that bind the rest of us in our social contract, who have reached a point where they can no longer connect.

But by this definition James Tilly Matthews, paranoid schizophrenic or not, was not mad. It is striking that throughout his story, even at the prodigious heights of his delusions, there are always those around who trust him, and he consistently inspires sympathy, affection and love.

From Mike Jay’s The Air Loom Gang: The Strange and True Story of James Tilly Matthews and his Visionary Madness (ISBN 0593049977, p58).

Matthews had previously been involved in peace negotions between France and England and returned believing himself controlled by a mysterious ‘air loom’. Also believing the government to be under its influence he shouted “treason!” in the House of Commons.

After his arrest and confinement at ‘Bedlam’ Hospital, he became the subject of the first ever book-length psychiatric case study in 1810. John Haslam, the hospital apothecary, wrote-up his case as part of an effort to embarass the medical establishment who he believed, contrary to their claims, did not understand either madness or Matthews’ case.

Link to article on James Tilly Matthews and the ‘air loom’ by Mike Jay.
Link to John Haslam’s 1810 ‘Illustrations of Madness’.

2006-01-13 Spike activity

Quick links from the past week in mind and brain news:

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Fantastic Time article on the recent burst of research on the psychology and neuroscience of meditation.

An article in Salon discusses the impact of traumatic brain injury on American soldiers serving in Iraq.

Study reports that babies that acquire certain infections during birth may be more likely to develop cerebral palsy.

The superior temporal cortex (part of the ‘auditory cortex’) kicks in during expectant listening, even during silence.

Nice pointer to some of the good work philosophers are now doing in the cognitive sciences: Jeffrey Foss writes an insightful article about consciousness in the Toronto Globe and Mail.

A third of people with schizophrenia who stop their medication do because of poor response suggests new study.

Stats monger The Economist investigates the increasing popularity of bayesian statistics in theories of brain function.

“My Brain Is a Walnut”. I know the feeling. Slate investigates the science of neuroimaging.

Why the brain has grey and white matter

Wen_Chklovskii_figure1.jpgA new paper in PLoS Computational Biology by Quan Wen and Dmitri Chklovskii reports on a computer model that would naturally separate into grey and white matter if asked to produce the optimum design for a brain that needs high interconnectivity and short conduction delays.

Computational models are often good ways of developing theories, and this research might help explain the purpose and role of the different cell types in the brain.

Unfortunately, my maths isn’t good enough to grasp the mechanics, but there’s some fascinating reading in there nonetheless. Published as an open access article. Share the computational biology love.

Link to ‘Segregation of the Brain into Gray and White Matter: A Design Minimizing Conduction Delays’.
Link to PLoS Computational Biology.

Neuroscience a target for fundamentalism?

A letter in today’s Nature from neuroscientist Kenneth Kosik makes an interesting point about the possible theological implications of neuroscience and suggests that it may become a new battleground in the ongoing tussles between scientific theory and religious fundamentalism:

The argument over evolution versus intelligent design, discussed in your News story “Day of judgement for intelligent design”, is a relatively small-stakes theological issue compared with the potential eruption in neuroscience over the material nature of the mind.

Siding with evolution does not really pose a serious problem for many deeply religious people, because one can easily accept evolution without doubting the existence of a non-material being. On the other hand, the truly radical and still maturing view in the neuroscience community that the mind is entirely the product of the brain presents the ultimate challenge to nearly all religions.

Link to full text of letter.

Mente Locale (Italian Mind Hacks)

mente_locale.jpgMente locale: Esperimenti, giochi, consigli per conoscere il proprio cervello e usarlo meglio di Tom Stafford, Matt Webb has been available since November 2005, it turns out. That’s the Italian translation of Mind Hacks, in case you didn’t guess. It has been translated by Anna Airoldi (who spotten an appropriate error in the English translation). Welcome Italian readers!

You can buy Mente Locale here, and I’ve put the Italian blurb for the book below the fold

Continue reading “Mente Locale (Italian Mind Hacks)”

The ‘hikikomori’ phenomenon

hikikomori_image.jpgWikipedia has a fascinating article on the phenomenon of hikikomori – where large numbers of Japanese adolescents are socially withdrawing, often to the extent of seeking extreme isolation and self-confinement, presumably due to various personal and social difficulties.

Although the article hints that hikikomori is considered a phenomenon of medical concern, there’s very little written about it in the medical literature catalogued on PubMed.

This may suggest that the (largely Western) medical literature has not touched on the subject, or that the phenomenon is not usually considered of psychiatric importance, even in Japan.

There’s plenty of links to news sources discussing the phenomena on the Wikipedia page, but I’ve not been able to find many substantial english language articles written for scientific or academic publications.

Any pointers greatfully received…

Link to Wikipedia article on ‘Hikikomori’.

Does cannabis cause psychosis?

cannabis_sativa.jpgPsyBlog has picked up on a recent article in The Independent that discusses the debate over cannabis and the risk of developing psychosis. This is currently topical in the UK in light of an expected government report about the legal re-classification of the drug.

Previously, it was known that there is an association between cannabis and psychosis, although it was not clear whether cannabis contributed to psychosis, or whether people with psychosis were simply more likely to ‘self-medicate’ with cannabis in an attempt to feel better.

A 2004 article in the British Journal of Psychiatry reviewed studies which allow a causal link, rather than simply an association, to be inferred, and sparked a debate (see PubMed entry) which has now led the goverment to think again about the recent downgrading of the legal penalties for possessing cannabis.

Although many psychiatrists and researchers now believe that cannabis is a causal factor in psychosis, the effect is still thought to be small in most people. Genetic studies have reported, however, that people holding certain versions of the COMT gene may be more likely to develop psychosis when cannabis is used.

Nevertheless, an alternative debate centres on whether public education and health services benefit for such a widely used drug to be outlawed, when other, potentially more harmful substances, are legally sold.

Link to Independent article ‘Cannabis: Can it really drive you mad?’
Link to PubMed entry of 2004 debate in the BJP (link to free full text articles).

Love in the asylum

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A stranger has come
To share my room in the house not right in the head,
A girl mad as birds

Bolting the night of the door with her arm her plume.
Strait in the mazed bed
She deludes the heaven-proof house with entering clouds

Yet she deludes with walking the nightmarish room,
At large as the dead,
Or rides the imagined oceans of the male wards.

She has come possessed
Who admits the delusive light through the bouncing wall,
Possessed by the skies

She sleeps in the narrow trough yet she walks the dust
Yet raves at her will
On the madhouse boards worn thin by my walking tears.

And taken by light in her arms at long and dear last
I may without fail
Suffer the first vision that set fire to the stars.

‘Love in the asylum’ by poet Dylan Thomas (1914 – 1953).

Neuroscience lectures on your desktop

cinema_sign.jpgNeuroscientist Michael Kilgard has found videos of leading mind and brain researchers giving lectures on their areas of interest, and created an online directory so you can view the talks at your leisure.

The speakers include language researcher Steven Pinker, memory afficianado Endel Tulving and attention pioneer Michael Posner.

This list includes almost 50 lectures in total, with topics ranging from drug addiction to vision.

Popcorn anyone?

Link to ‘Online Neuroscience Lectures’.

UPDATE: Grabbed from the comments page… “The article seems to be missing lectures from Christof Koch about consciousness”. (Thanks Mxr!)

LSD discoverer turns 100

lsd_molecule.jpgAlbert Hofmann, discoverer of LSD, is 100 this week and discusses his controversial discovery in an article in the New York Times.

Hofmann’s birthday is being marked by a symposium in Switzerland, where scientists, visionaries and artists are meeting to discuss the impact of the compound on society and how it may be put to good use in the future.

Link to article “Nearly 100, LSD’s Father Ponders His ‘Problem Child'”.

UPDATE: The Independent has another (probably better) article on LSD, Hofmann and the symposium.

Brain in a vat

atomicbrain2.jpgIf you ever wanted to recreate scenes from movies like The Brain That Wouldn’t Die or The Man with Two Brains, now’s your chance with a plastic version now being sold online.

On a more serious note, one of the most famous thought experiments in contemporary philosophy is about a brain in a vat and is used as a way of enquiring about the nature of reality and how much we can trust our senses.

Link to fully working ‘brain in a vat’.

Mind Hacking at the gym

weights.jpgMost of the time it feels as though our perception of the world is based on what’s out there, what psychologists call ‘stimulus-driven’ or ‘bottom up’ processing. But in reality, our perceptual experience is a seamless mixture of both what really is out in the world and what we expect to be out there (so-called ‘top down’ or ‘concept-driven’ processing). Tom gave an elegant example of this in a recent post, describing how so many people hadn’t noticed the erroneous use of the word ‘conservations’ in the Mind Hacks book, when it should have said ‘conversations’ – in this case readers saw what they expected, not what was written.

I was struck by a couple of similar examples in recent visits to the gym. On the first occasion I’d just finished on the running machine where I have to really crank up my MP3 player volume to drown out the loud music played over the public speakers. When I sat down in the far quieter weights section, the volume on my headphones suddenly felt painfully loud in this quieter environment, and so I quickly jabbed the volume down a few notches. I felt such a relief as the music gradually softened and my eardrums were saved. It was only much later that I realised my MP3 player’s controls were in the lock position – I hadn’t turned the volume down at all. My expectations had overridden the true information arriving at my senses.

On my next visit I proudly grabbed two 14kg (don’t laugh!) dumbbells for some bicep curls. I’d worked up to this weight over recent months and considered it my limit. I was pumping away but my left arm was really struggling, which I put down to it being my weaker arm. Still, I persevered and did my usual number of reps. It was only when I went to replace the dumbbells that I saw the weight in my left arm was 18kg! – someone had put the weights in the wrong places… Well, I thought, maybe I’ve not been pushing myself enough, but no, later on when I went to try out some curls with 18kg weights, it was hopeless: when I ‘knew’ what the weight was it ‘felt’ too heavy!

Anyone got some other examples?