Taking emotions at face value

Boston Magazine has a fascinating article on the work of psychologist Lisa Feldman Barrett who has been leading the charge against the idea that we recognise the same facial expression of emotion across the world.

This was first suggested by Paul Ekman whose work suggested that humans can universally recognise six emotions: anger, disgust, fear, happiness, sadness, and surprise.

His research involved showing people from different cultures pictures of faces and asking them to label each expression from a choice of emotional words.

But Barrett has found a simple flaw in the procedure:

She returned to those famous cross-cultural studies that had launched Ekman’s career—and found that they were less than watertight. The problem was the options that Ekman had given his subjects when asking them to identify the emotions shown on the faces they were presented with. Those options, Barrett discovered, had limited the ways in which people allowed themselves to think.

Barrett explained the problem to me this way: “I can break that experiment really easily, just by removing the words. I can just show you a face and ask how this person feels. Or I can show you two faces, two scowling faces, and I can say, ‘Do these people feel the same thing?’ And agreement drops into the toilet.”

The article is on much more than this controversy in cognitive science and also tracks how research on emotion and facial expression is playing an increasing role in law enforcement – with not all of it well supported by evidence.

And if you want links to some of the scientific papers, the always interesting Neuroanthropology blog has more at the bottom of this post.

Link to Boston Magazine article ‘About Face’.

Great cure but we lost the patient

The Journal of Neuroscience has a surprising case report of a patient who was treated with an implanted brain stimulator to treat severe movement side-effects from an extended period of taking antipsychotic drugs for behavioural problems.

This is the background to the case:

A 27-year-old woman with developmental delay and severe behavioural disturbance was treated with risperidone 6 mg/day from age 14. At age 20, she developed facial twitching, blinks, and truncal extension spasms, which persisted during both sitting and lying supine. By age 21, she was no longer able to walk due to the spasms. She became housebound and was forced to ambulate by crawling, to the extent that she developed post-traumatic cysts over both knees. She was unable to sit in a chair. She was forced to eat from a plate on the floor while kneeling because the extension spasms were too severe in other positions.

The movement problems were due to tardive dystonia – a problem where the brain’s automatic control of muscle tone stops working.

When you move, some muscles need to contract while others need to relax. This happens automatically but turns out to be a complex brain process that is mediated by important dopamine pathways in a deep brain area called the basal ganglia.

Antipsychotic medication was first widely used to treat the delusions and hallucinations of psychosis but is increasingly being used to treat ‘behavioural disturbance’ (normally meaning aggression) as it can be slightly sedating and reduces anxiety.

This medication works by blocking dopamine receptors but in high doses it can lead to temporary and, occasionally, permanent movement problems due to its effects on the dopamine-mediated movement pathways in the brain.

This most typically appears as tic-like movements called tardive dyskinesia, Parkinson’s-disease like stiffness, a form of restlessness called akithisia, or movement problems that affect muscle tone – which is what this patient had.

These severe symptoms were treated in similar way to one option for Parkinson’s disease – a deep brain stimulation device was inserted into the brain to send electrical pulses directly into the basal ganglia to help regulate the movement circuits.

It turns out that many studies have reported the results of putting brain implants in people to treat movement side effects from antipsychotic drugs.

It’s probably true to say that some people have been left with permanent movement problems from the days when large doses of antipsychotics were prescribed and the side-effects were poorly understood.

These days, one of a psychiatrist’s most important jobs is to avoid these unwanted effects.

From one perspective, no matter how the situation arose, patients deserve the best possible treatments, of which deep brain stimulation is certainly one.

But still, you can’t help thinking it’s kind of a bleak situation where brain implants are needed to treat medication side-effects.

When used appropriately, antipsychotics can be a genuinely useful form of treatment but cases like these serve to remind us how far we have to go in developing safer psychiatric medications.

Link to locked Journal of Neuroscience case report.

Workout music and your supplementary motor cortex

Why do we like to listen to tunes when we exercise? Psychologist Tom Stafford searches for answers within our brains, not the muscles we are exercising.

Perhaps you have a favourite playlist for going to the gym or the park. Even if you haven’t, you’re certain to have seen joggers running along with headphones in their ears. Lots of us love to exercise to music, feeling like it helps to reduce effort and increase endurance. As a psychologist, the interesting thing for me is not just whether music helps when exercising, but how it helps.

One thing is certain, the answer lies within our brains, not the muscles we are exercising. A clue comes from an ingenious study, which managed to separate the benefits of practicing a movement from the benefits of training the muscle that does the movement. If you think that sounds peculiar, several studies have shown that the act of imagining making a movement produces significant strength gains. The benefit isn’t a big as if you practiced making the movement for real, but still the benefit of thinking about the movement can account for over half of the benefit of practice. So asking people to carry out an imaginary practice task allows us to see the benefit of just thinking about a movement, and separates this from the benefit of making it.

Imaginary practice helps because it increases the strength of the signal sent from the movement areas of the brain to the muscles. Using electrodes you can record the size of this signal, and demonstrate that after imaginary practice people are able to send a stronger, more coherent signal to the muscles.

The signals to move the muscles start in an area of the brain called, unsurprisingly, the motor cortex. It’s in the middle near the top. Part of this motor area is known as the supplementary motor cortex. Originally thought to be involved in more complex movements, this area has since been shown to be particularly active at the point we’re planning to make a movement, and especially crucial for the timing of these actions. So, this specific part of the brain does a very important job during exercise, it is responsible for deciding exactly when to act. Once you’ve realised that a vital part of most sporting performance is not just how fast or how strong you can move, but the effort of deciding when to move, then you can begin to appreciate why music might be so helpful.

The benefits of music are largest for self-paced exercise – in other words those sports where some of the work involved is in deciding when to act, as well as how to act. This means all paced exercises, like rowing or running, rather than un-paced exercises like judo or football. My speculation is that music helps us perform by taking over a vital piece of the task of moving, the rhythm travels in through our ears and down our auditory pathways to the supplementary motor area. There it joins forces with brain activity that is signalling when to move, helping us to keep pace by providing an external timing signal. Or to use a sporting metaphor, it not only helps us out of the starting blocks but it helps to keep us going until we reach the line.

Of course there are lots of other reasons we might exercise to music. For example, a friend of mine who jogs told me: “I started running to music so I didn’t have to listen to my own laboured breathing.” He might well have started for that reason, but now I’ll bet the rhythm of the music he listens to helps him keep pace through his run. As one song might have put it, music lets us get physical.

This is my BBC Future column from last week. The original had the much more accessible title of “The Psychology of Workout music“, but mindhacks.com is our site (dammit) and I can re-title how I want.

What is it like being nerve gassed?

I’ve just found an interesting article in the Journal of Pharmacy Practice that discusses the medical management of chemical weapons injuries.

It has a particularly attention-grabbing section that describes the effects of being nerve gassed. I’ve pasted it below, but as it was dense with medical jargon, I’ve added explanations in square brackets.

The nerve agents prevent the breakdown of [neurotransmitter] acetylcholine resulting in a cholinergic crisis. Muscarinic effects from nerve agents include miosis [constriction of the pupils of the eyes], bradycardia [slowed heartbeat], diarrhea, nausea and vomiting, diaphoresis [excessive sweating], bronchial secretions [fluid in the lungs], and bronchial constriction [lung tightening]. A dimming of vision occurs with the miosis.

Nicotinic effects include tachycardia [fast heartbeat] and muscle twitching which progresses to muscle paralysis. The toxidrome [poisoning syndrome] depends of the route of absorption. When dermally absorbed [through the skin] muscle twitching occurs first. With inhalation exposure, breathing difficulties are seen first.

The onset of symptoms with inhalation exposure is within 5 minutes. With dermal exposure, it can last up to several hours. The seizures due to nerve agents may be from blocking [neurotransmitter] γ-aminobutyric acid (GABA).

The article also discusses other types of chemical weapons: blister agents, choking agents, incapacitating agents, riot control agents, blood agents, and toxic industrial chemicals. All of which sound very unpleasant.

However, ‘incapacitating agents’ can also mean substances that have psychotropic effects. These can be anything which drug the person to a state where they are less able to resist.

In theory, these could be anything, but the article particularly notes opioid-based gasses (think vaporised synthetic heroin – like the fentanyl derivative used in the 2002 Moscow theatre siege by Russian special forces) or the hallucinogenic drug BZ which has featured in many favourite conspiracy theories.

Link to locked article on chemical weapons medicine.

A taxonomy of ayahuasca hallucinations

A wonderful list categorising hallucinations experienced by the Cashinahua people of Peru after drinking the hallucinogenic brew ayahuasca.

1. Brightly colored, large snakes
2. Jaguars and ocelots
3. Spirits, both of ayahuasca and others
4. Large trees, often falling trees
5. Lakes, frequently filled with anacondas and alligators
6. Cashinahua villages and those of other Indians
7. Traders and their goods
8. Gardens

It was reported by the anthropologist Ken Kensinger in a chapter in the book Hallucinogens and Shamanism.

It reminded me of writer Jorge Luis Borges’ whimsical classification system for animals.

Is social psychology really in crisis?

My latest ‘behind the headlines’ column for The Conversation. Probably all old news for you wised-up mindhacks.com readers, but here you go:

The headlines

Disputed results a fresh blow for social psychology

Replication studies: Bad copy

The story

Controversy is simmering in the world of psychology research over claims that many famous effects reported in the literature aren’t reliable, or may even not exist at all.

The latest headlines follow the publication of experiments which failed to replicate a landmark study by Dutch psychologist Ap Dijksterhuis. These experiments are examples of what psychologists call “social priming”, which is a phenomenon where people who are exposed to ideas unconsciously incorporate them into their behaviour. So people who are reminded of old age are reported to walk slower, and people asked to think about university professors do better on a trivial pursuit knowledge test.

What they actually did

The first of Dijksterhuis’ original experiments asked people to think about the typical university professor and list on paper their appearance, lifestyle and behaviours. After this they answered 42 questions taken from Trivial Pursuit.

The experiment found that people who had thought about professors scored 10% higher than people who hadn’t been primed in this way. In this latest report, David Shanks, Head of the Division of Psychology and Language Sciences at University College London and colleagues tried to replicate this effect in nine separate experiments. They didn’t find the effect in any of their experiments, which they suggest calls into question the validity of the original research.

How plausible is it

It’s extremely plausible that people are influenced by recent activities and thoughts – the concept of priming is beyond question, having been supported by decades of research.

What’s less established is whether these effects are really “unconscious” (whatever that means) and whether sophisticated concepts like intelligence can really worm their way into our behaviour in such a profound way.

Tom’s take

The headline reporting of this spat is misleading – there’s nothing worrying about disputed results for social psychology. The process of affirming, disputing and denying results is part of the normal part of science. What is worrying is that this failed replication comes on top of other failed replications of famous social priming results and after the discovery of some high profile frauds in psychology, such as Diederik Stapel.

This has led some to talk of a crisis in experimental social psychology, centring on whether standards of research in the area have slipped enough to allow false results to become easily accepted.

The whole situation is a wonderful opportunity to see “under the hood” of science and see how it really works (rather than how we’re taught it should work). Everything is in the mix: fundamental conceptual disagreements (about the nature of unconscious processing), disciplinary tribalism (between cognitive psychologists and social psychologists), big dog personalities and emotions running high, academic fashion creating a scientific “bubble” (this is that bubble bursting) and soul-searching questions about whether our methods as researchers are fit for purpose.

My guess is that, when the dust settles, we’ll find out that priming effects can work – but they aren’t as strong or common as reported. I have faith that most effects reported in the literature will turn out to true in some form – the vast majority of psychologists are honest and methodical – but we also know for sure than some effects will turn out to have been chimeras, we just can’t say for sure in advance which.

The really interesting aspects to the debate, from my point of view, is going to be clarifying exactly how unconscious these effects are. My prejudice is that social psychologists have been overly casual about using that word, using it in circumstances which would contradict the way most people use it, whether they’re psychologists or not.

Read more

Shanks, D. R., Newell, B. R., Lee, E. H., Balakrishnan, D., Ekelund, L., Cenac, Z., Fragkiski, K. & Moore, C. (2013). Priming Intelligent Behavior: An Elusive Phenomenon, PloS one, 8(4), e56515.

Ed Yong on Bargh’s response to another failure to replicate

Rolf Zwaan on the theory of social priming

Rolf Zwaan on replication done right

Tom Stafford does not work for, consult to, own shares in or receive funding from any company or organisation that would benefit from this article, and has no relevant affiliations.

The Conversation

This article was originally published at The Conversation.
Read the original article.

An unrecognised revolution in street drug design

I’ve got an article in The Observer about the ongoing but little recognised revolution in street drug design being pushed forward by the ‘legal high’ market.

Since 2008 we’ve seen the first genuine wave of ‘designer drugs’ that are being produced by science-savvy professional labs that are deliberately producing substances to avoid drug laws.

New substances are appearing at a rate of more than one-a-week and some are completely new to science.

The article looks at how the clandestine labs are creating these new highs and what this almost impossible to regulate situation means for the ‘war on drugs’ approach to recreational drug use.

Link to article in The Observer.