Is infantile amnesia a myth?

There’s a great post from Developing Intelligence looking at research on ‘infantile amnesia’ – the ‘amnesia’ we have for events that happened before about 3 years of age.

It turns out that studies done on young babies, even babies in the womb, have shown that infants have got surprisingly good memory.

As reviewed by Hayne, 3-day-old infants were capable of distinguishing a particular passage (from Dr. Seuss’s “Cat in the Hat”) that had been read to them twice daily for the last 6 weeks of gestation from similar passages (matched for word count, length, and prosody). What’s more, these infants preferred the familiar passage even if spoken by someone other than their mother, strongly suggesting that they had encoded (and retained) a relatively high-level representation of the passage’s auditory content.

The post looks at the mystery of how we have such trouble remembering this period, when psychology studies show that infants’ memory is actually quite good.

Link to ‘The Myth of Infantile Amnesia’.

Mind control and the modern citizen

The Washington Post has an intriguing article on people who believe they are subject to secret government ‘mind control’ technology.

People who experience voices being ‘beamed’ into their heads or forces acting on their bodies, have formed communities on the internet to support each other and to lobby the government to stop what they claim are illegal tests of this ‘invasive technology’.

Critics argue that they are simply mentally ill, and indeed some probably are. In a paper published last year myself and some colleagues reported that some people show obvious signs of psychosis. Despite this, however, they have formed complex and innovative online communities.

Many members of this community are obviously not mentally ill though, and have concerns that might seem a little unusual but are no different from the types of concerns that drive JFK, 9/11 and Princess Diana enthusiasts.

One of the most interesting aspects of this community, in all its diversity, is that it challenges the psychiatric notion of what is considered a delusion.

In one of the more curious episodes during the last consultation for the UK Government’s Draft Mental Health Bill, an organisation called Christians Against Mental Slavery made a surprising submission to the parliamentary committee.

Even if you don’t buy their premise that the government is testing ‘Mind Invasive Technology’ on people, they make some pertinent points.

For example, they suggest that if a psychiatrist is presented with someone who complains of being affected by microwave mind control technology (not uncommon in psychosis), they should put them in Faraday cage to see if their experiences stop, so the psychiatrist can try and test whether they are genuinely delusional.

The fact that delusions are diagnostically ‘false beliefs’ but clinicians largely rely on assumptions (rather than tests) about the truth of a belief, is a point that has also been made in the medical literature.

Indeed, some authors have argued as a result, that the falsity condition should be rejected as one of the criteria in diagnosis.

One interesting point, rarely considered by the mind control community or its critics, is that it is possible, indeed common, to have isolated or restricted psychosis-like experiences that are relatively benign.

For example, someone might hear voices, have unusual beliefs, or experience their thoughts being broadcast or altered from outside, while not being significantly disabled by their experiences.

The fact that someone could have reasonable concerns about ‘mind control’ technology, which governments have certainly tried to develop, while also hearing voices or having other similarly unusual experiences, is often overlooked.

Link to Washington Post ‘Mind Games’.

waking life crossword experiment

waking-life-4.jpgIn Richard Linklater’s Waking Life (2001) two of the characters discuss the idea synchronicity. They mention an experiment where people were isolated and given daily crosswords. If the crossword puzzles were a day old, meaning that thousands of people had already completed them, then people found it easier to get the answers – because the answers were already ‘out there’ in the collective memory of course.

The question is: did anyone ever really do this experiment, or anything like it, and what are the references? I’m not expecting that it would really produce a significant effect, but I’d still love to know if anyone has tried it.

Answers in the comments please

Link: Article on The Baader-Meinhof Phenomenon from damninteresting.com

I’ve put the relevant except from the script below the fold…

Continue reading “waking life crossword experiment”

Amnesia affects ability to imagine the future

There’s an interesting New Scientist news report on recent research suggesting that people with amnesia have difficulty imagining the future, suggesting this ability relies on our capacity to remember past experience.

The study was led by Dr Eleanor Maguire and involved five participants with dense amnesia caused by damage to the hippocampus on both sides of the brain.

Researchers asked the participants ‚Äì and a control group without amnesia ‚Äì to imagine several future scenarios, such as visiting a beach, museum and castle, and to describe what the experience would be like. They then analysed the subjects’ narrations sentence by sentence, scoring each statement based on whether it involved references to spatial relationships, emotions or specific objects.

All but one of the amnesiacs were worse at imagining future events than the participants in the trial who did not suffer from amnesia. Their visualisations of future events were more likely to be disorganised and emotionless. “It’s not very real. It’s just not happening. My imagination isn’t‚Ķwell, I’m not imagining it, let’s put it that way,” one patient told researchers during a trial.

Apparently, the research will be published in the science journal Proceedings of the National Academy of Sciences but I’m damned if I can find it at their website or on PubMed, but presumably it will appear shortly.

Link to NewSci story ‘Amnesiacs struggle to imagine future events’.
Link to write-up from Nature News.

Archive footage of shell shock patients

I’ve just uploaded some archive film footage to YouTube of shell shock patients from World War One, taken from a recent Channel 4 documentary on soldiers executed for cowardice.

I was surprised to find that there is almost no video of this historically and clinically important condition on the internet.

The clip has footage of patients who displayed some extreme ‘shell shock’ reactions, including paralysis, shaking and convulsions.

These physical reactions are now considered a form of conversion disorder, where extreme emotional stress or turmoil is expressed as physical symptoms.

The clip also discusses the case of Private Harry Farr (covered previously on Mind Hacks) who was executed for cowardice, despite having been affected by the condition.

If you didn’t catch it the first we mentioned it, the recent article about his case that was recently published in the Journal of the Royal Society of Medicine [pdf] is a gripping and thought-inspiring read.

Link to YouTube video of shell shock patients.
pdf of article ‘The life and death of Private Harry Farr’.

Ninety minutes blindfolded enhances your hearing

The BPS Research Digest reports on a new study that shows that 90 minutes of being blindfolded significantly improves our ability to locate sounds.

Next the participants spent 90 minutes sitting quietly with the blindfold on. Crucially, when they repeated the [sound location] task after this, their accuracy was improved as they no longer underestimated the location of the sounds as much… In fact their performance had become more typical of a blind person performing this kind of task.

There’s more on the study over at the BPSRD including a link to the original paper.

Link to BPSRD article.

Encephalon 14 at Mixing Memory

The latest edition of neuroscience writing carnival Encephalon has just arrived and covers everything from the philosophy of mind to, er… a neuroscience-themed death metal band.

A couple of my favourites include a post on which type of model of the mind is best for cognitive science from Memoirs of a Postgrad, and Pure Pedantry’s article on whether doing crosswords will prevent mental decline in old age.

These two are just a taster. Head on over for the full menu.

Link to Encephalon 14.

Looking through the eyes of others

There’s a fascinating opinion piece by psychologist Michael Tomasello in The New York Times arguing that humans, unlike other apes, have evolved to have the whites of our eyes showing to make social cooperation easier.

The idea is that this allows us to easily work out where other humans are looking, and this can help us to work out focus of attention and intention.

It has been repeatedly demonstrated that all great apes, including humans, follow the gaze direction of others. But in previous studies the head and eyes were always pointed in the same direction. Only when we made the head and eyes point in different directions did we find a species difference: humans are sensitive to the direction of the eyes specifically in a way that our nearest primate relatives are not. This is the first demonstration of an actual behavioral function for humans’ uniquely visible eyes.

Link to NYT article ‘For Human Eyes Only’.

A humanoid robot you can control with your thoughts

The University of Washington Neural Systems Lab have created a humanoid robot you can control with your thoughts.

I’ll say that again – a humanoid robot you can control with your thoughts

The future is here. Thank you and goodnight.

The control system is a type of EEG-based non-invasive brain-computer interface and the page has video of the robot in action, as well as a video that describes the neuroscience of how the interface works.

Link to Neural Systems Lab robot info page (via MakeZine Blog).

‘Traumatic stress disorder’ in a 5 month old baby

Sometimes I think there’s some sort of secret competition going on with American mental health professionals to see who can diagnose mental illness in the youngest child.

The BPS Research Digest reports on a recently published case study of ‘traumatic stress disorder’ (supposedly an infant equivalent to PTSD) in a 5-month-old child.

There’s no doubt that young children can become disturbed, but many clinicians doubt that mental disorder manifests itself in the same way in children.

In some cases it hardly seems to manifest at all. For example, psychosis very rarely occurs in children from 10-16 years, and is almost unknown at younger ages.

Although no-one is quite sure why, the typical age of onset for psychosis is about 18-30 years.

Almost all psychiatric diagnosis is made on the basis of a detailed interview in which the patient describes their mental state, guided by careful questioning from the clinician.

Like other diagnoses, the diagnostic criteria for adult PTSD has many points which could only be discovered through interview.

Therefore, the diagnosis of any psychiatric disorder in a pre-verbal child or child with developing language skills would have to be made on very broad criteria.

So broad, some would say, to be highly unreliable or of doubtful validity.

The author of the case study, psychologist Aletha Solter, admits that the adult criteria would be inapplicable, and instead applies diagnostic criteria for pre-verbal children developed by charity Zero to Three (intro online as pdf).

However, despite the fact that these diagnostic criteria do not rely on verbal report, it’s still not clear whether they represent a reliable and valid way of diagnosing problems in very young children.

Link to BPSRD on ‘post-traumatic stress in a five-month-old baby’.
Link to abstract of case report.

Beautiful 19th century papier mache brain

Medical history website Physick has some images of a wonderful papier mache brain created in the 19th Century as an anatomical aid for doctors.

Human cadavers were difficult to get hold of in the 19th Century (at least legitimately) and the whole exercise was a bit murky, even for medical education.

Consequently, a large number of anatomical models were created from wax, or in this case papier mache, to teach anatomy to medical students.

This means there’s now some beautifully crafted and artistic anatomical models in museums around the world.

Link to papier mache brain exhibit.
Link to Brain Hammer with more brain-related Physick exhibits.

Loved up through the power of hypnosis

A surprising study published last year in the Journal of Psychoactive Drugs reported that hypnotism could be used to induce a realistic experience of being high on MDMA (aka ‘ecstasy’) in people who had taken the drug before.

An extended nondrug MDMA-like experience evoked through posthypnotic suggestion

J Psychoactive Drugs. 2006 Sep;38(3):273-83.

Hastings A

This research explored whether hypnotic suggestion could produce a subjective mindbody condition similar to that produced by the psychoactive drug methylenedioxy methamphetamine (MDMA, Ecstasy). Twelve participants received posthypnotic instructions to re-experience an MDMA-like state posthypnotically, similar to one in their prior experience, for one hour. Three separate self report measures and qualitative self reports showed that the posthypnotic condition effectively mimicked an MDMA-like experience, lasting an hour at a stable level. Participant ratings in real time and in retrospect ranged from 36% to 100% similarity to a drug-induced experience. The qualitative reports and rating scales enabled a phenomenological description of the subjective experience. Scores on the Tellegen Absorption Scale correlated significantly with the strength of the posthypnotic condition (Spearman rho .87, p = .0003). The participants successfully carried out various intentional activities during this time (e.g., self reflection, talking with partners about relationships, artwork, walking in nature). Applications for this technique as an adjunct to therapy and health treatments are discussed.

It’s interesting to speculate how this effect occurs. A brain imaging study has shown that in patients with Parkinson’s disease who take regular medication for the condition, a placebo actually causes the brain the mimic the effects of the medication.

Perhaps the participants hypnotised to believe they are re-experiencing the effects of MDMA genuinely re-experience the neurochemical effects of the drug to some degree.

Link to PubMed entry.

2007-01-12 Spike activity

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

Cognitive Daily examines how sound affects our visual perception (with nifty video!).

Does a US Government training cartoon make light of mental health issues in war veterans? Decide for yourself.

Science reports that a new study uncovers exactly how solvent abuse affects the brain.

Ramachandran discusses the neurology of self-awareness in the Edge 10th anniversary essay.

Neurontic considers the links between Capgras delusion, reasoning and the limits of the rational mind.

Is there such a thing as a truth serum? Retrospectacle investigates.

Neurocritic looks at research research applying fMRI brain scanning technology to people making shopping decisions.

New Scientist looks at research on the surprisingly accuracy of snap decisions.

King of the Cortex: the functions of the anterior prefrontal cortex, the very front of the brain, are discussed by Developing Intelligence.

Experimental tripping for the US military

There’s an interesting interview over at 10 Zen Monkeys with psychiatrist James S. Ketchum who claims to have been director of psychopharmacology research for the US military when they were testing the potential of mind-altering drugs such as LSD and BZ.

Ketchum has just released a book entitled Chemical Warfare: Secrets Almost Forgotten where he recounts his time working in the labs and the research that was carried out there.

Notably, Ketchum makes a distinction between the research programme he was involved with, and the CIA’s now famous Project MKULTRA, which also looked at ways of influencing the mind and involved a significant amount of LSD research.

The book has been independently published, so make of that what you will (conspiracy theorists, start your engines), but there’s some excerpts online if you want to judge for yourself.

Link to interview with Dr James Ketchum (via BoingBoing).
Link to Chemical Warfare: Secrets Almost Forgotten website.
Link to excerpts.