A ground-breaking new study reveals the neurological basis of seminal East Coast hip-hop pioneers Run-D.M.C.
The study is Diffusion tensor imaging of the hippocampus and verbal memory performance: The RUN DMC Study, and it actually has nothing to do with hip-hop, but it does have one of the best study acronyms I have ever seen.
RUN DMC stands for the "Radboud University Nijmegen Diffusion tensor and Magnetic resonance imaging Cohort study".
Or maybe it does relate to rapping. Because the paper is about verbal memory, and if there's one thing a rapper needs, it's a good memory for words, otherwise they'd forget their lyrics and... OK no, it doesn't relate to hip-hop.
It is however a very nice piece of research. They took no fewer than 503 elderly people - making this by far the single biggest neuroimaging study I have ever read. They used DTI to measure the quality of white-matter tracts in the brain and correlated this with verbal memory function. DTI is an extremely clever technique which allows you to measure the integrity of white matter pathways.
The theory behind the study is that in elderly people, white matter often shows degeneration. This is thought to be caused by vascular disease - problems with the blood flow to the brain, such as cerebral small-vessel disease which means, essentially, a series of mild strokes, which often go unnoticed at the time, but they build up to cause brain damage, specifically white matter disruption.
The symptoms of this are extremely varied and can range from cognitive and memory impairment, to depression, to motor problems (clumsiness), all depending on where in the brain it happens.
All of the people in this study had cerebral small-vessel disease as defined on the basis of symptoms and the presence of visible white matter lesions on the basic MRI scan. The authors found that the integrity of the white matter tracts in the area of the hippocampus, as measured with DTI, correlated with performance on a simple word learning task:
The healthier the hippocampal white matter, the better people did on the task. This makes sense as the hippocampus is a well known memory centre. This is only a correlation, and doesn't prove that the hippocampal damage caused the memory problems, but it seems entirely plausible. The authors controlled for things like age, gender, and the size of the hippocampus, as far as possible.
Should we all be worried about our white matter when we get older? Quite possibly - but luckily, the risk factors for vascular disease are quite well understood, and many of them are things you can change by having a healthy lifestyle.
Smoking is bad news, as are hypertension (high blood pressure), obesity, and high cholesterol. Diabetes is also a risk factor. So you should quit smoking, eat well, and ensure that you're getting tested and if necessary treated for hypertension and diabetes. All of which, of course, is a good idea from the point of view of general health as well.
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Neural Correlates of 80s Hip Hop
01.05
wsn
Posted in
funny,
mental health,
music,
papers
The Neuroscience of MySpace
07.40
wsn
How does popularity affect how we judge music?
We tend to say we like what other people like. No-one wants to stand out and risk ridicule by saying they don't enjoy universally loved bands, like The Beatles... unless they're trying to fit into a subculture where everyone hates The Beatles.
But do people just pretend to like what others like, or can perceived popularity actually change musical preferences? Do The Beatles actually sound better because we know everyone loves them? An amusing Neuroimage study from Berns et al aimed to answer this question with the help of 27 American teens, an fMRI scanner, and MySpace.
The teens were played 15 second clips of music, and had to rate each one a 5 star scale of quality. Before the experiment they listed their preferred musical genres, and they were only given music from genres they liked. To make sure no-one had heard the songs before, the researchers went on MySpace and found unsigned artists...
A total of 20 songs were downloaded in each of the following genres: Rock, Country, Alternative/Emo/Indie, Hip-Hop/Rap, Jazz/Blues, and Metal (identified by the MySpace category).The twist was that each song was played twice: the first time with no information about its popularity, and then again, either with or without a 5 star popularity score shown on the screen. Cleverly, this was based on the number of MySpace downloads. This meant that the subjects had a chance to change their rating based on what they'd just learned about the song's popularity.
What happened? Compared to doing nothing, hearing music activated large chunks of the brain, which is not very surprising. In some areas, activity correlated with how highly the listener rated the song:
The regions showing activity correlated with likability were largely distinct from the auditory network and were restricted to bilateral caudate nuclei, and right lateral prefrontal cortices (middle and inferior gyri). Negative correlations with likability were observed in bilateral supramarginal gyri, left insula, and several small frontal regions.The headline result is that a song's popularity did not correlate with activity in this "liking music network", and nor did activity in these areas correlate with each teen's individual "conformism" score, i.e. how willing they were to change their ratings in response to learning about the song's popularity. Berns et al interpreted this as meaning that, in this experiment, popularity did not affect whether the volunteers really enjoyed the songs or not.
Instead, activity in some other areas was associated with conformism:
we found a positive interaction in bilateral anterior insula, ACC/SMA, and frontal poles. Given the known roles of the anterior insula and ACC in the cortical pain matrix, this suggests that feelings of anxiety accompanied the act of conforming....Interestingly, the negative interaction revealed significant differences in the middle temporal gyrus... the popularity sensitive individuals showed significantly less activation. This suggests that sensitivity to popularity is also linked to less active listening.
*
This paper is a good example of using neuroimaging data to try to test psychological theories, in this case, the theory that social pressure influences musical enjoyment. This is makes it better than many fMRI studies because, as I have warned, without a theory to test it's all too easy to just make up a psychological story to explain any given pattern of neural responses.But there's still an element of this here: the authors suggest that conformism is motivated by anxiety, not because anyone reported suffering anxiety, but purely because it was associated with activity in the anterior insula etc. This is putting a lot of faith in the idea that anterior insula etc activity means anxiety - it could mean a lot of other things. There's also the question of whether letting people rate the songs for the first time before telling them about the popularity is the best way of measuring social pressures.
The most serious omission in this study, however, is that we're not told about the correlations between music preference and conformism. The world needs to know: are kids who like "Alternative/Emo/Indie" music free-thinkers, or are they really the biggest conformists of all? The paper doesn't tell us. In the absence of empirical evidence, we'll have to rely on South Park...
Stan: But if life is only pain, then...what's the point of living?
Fringe-flicking Goth: Just to make life more miserable for the conformists. (flicks fringe)
Stan: Alright, so how do I join you?
Goth Leader: If you wanna be one of the non-conformists, all you have to do is dress just like us and listen to the same music we do.
- South Park, "Raisins"
Berns, G., Capra, C., Moore, S., & Noussair, C. (2010). Neural mechanisms of the influence of popularity on adolescent ratings of music NeuroImage, 49 (3), 2687-2696 DOI: 10.1016/j.neuroimage.2009.10.070 Posted in
fMRI,
funny,
music,
neurofetish,
papers
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