Showing posts with label experts. Show all posts
Showing posts with label experts. Show all posts

Saturday, April 30, 2016

How Music Affects The Brain: Using MRI to Study the Brain of a Virtuoso Violinist

reposted from http://neurosciencenews.com/violinist-music-fmri-3821/


How Music Affects The Brain: Using MRI to Study the Brain of a Virtuoso Violinist

Until just a few years ago, violinist Jennifer Koh had no particular interest in the inner workings of the brain.
But then she suffered a concussion resulting in speech and memory loss. She couldn’t practice her violin for months; when she picked up the instrument again, she could play for no more than 20 minutes at a time.
Suddenly, Koh wanted all the knowledge she can muster about the brain. She read. She pestered friends who work in medical fields. And this week at Duke, she underwent a functional magnetic resonance imaging scan – known as an functional MRI – in the hope it can help explain how the brain of a professional musician works.
“I have a general curiosity about the relationship between human beings and music,” said Koh, a touring professional who has played the violin since she was 3 years old. “No matter what the culture, no matter what the country … music is a fundamental part of human beings.”
Koh’s fMRI this week was an unexpected offshoot of a visit to campus in January as an artist-in-residence sponsored by Duke Performances, during which time she gave a recital at Baldwin Auditorium and participated in some classes. One was “Music and the Brain,” which explores the intersection of music and neuroscience and is taught jointly by professors Scott Lindroth of the music department and Tobias Overath from the Duke Institute for Brain Sciences.
Koh is among the nation’s most well-regarded musicians. A Chicago native, she made her major symphony debut at age 11 with the Chicago Symphony Orchestra and has performed with dozens of professional symphonies around the world. She was recently named Instrumentalist of the Year by Musical America magazine, the oldest American magazine covering classical music. 
Knowing Koh was returning to campus this week to perform the Beethoven violin concerto with the Duke Symphony Orchestra, Overath reserved an MRI slot at the Duke-UNC Brain Imaging and Analysis Center (BIAC) – which funded the test — and set out to create a research study with the violinist’s brain as its subject.
Laying motionless on her back in the MRI machine while her brain activity was being measured, Koh was asked to imagine playing a series of classical works for solo violin by Paganini and Bach, to listen to them, or to read their musical scores. Overath then studied how Koh’s brain reacted to each.
The results, he said afterwards, showed a unique activation pattern for when she was listening, reading, and imagining playing music. However, there were also some common traits: For example, brain areas responsible for planning movements were active in all three tasks, even though Koh never lifted a finger.
Photo of violinist Jennifer Koh.
Violinist Jennifer Koh used her visit to Duke to learn more about brain function. Credit: Duke University.
“The musician’s brain is exquisitely sensitive to all aspects of music, be it listening, reading or imagining playing music,” Overath said. “Therefore, you engage a whole range of areas of your brain – it’s quite literally a whole body experience. From a cognitive point of view, but also physically, it’s incredibly strenuous.”
Overath himself is a musician: he played violin for 16 years before transitioning to the viola, which he played for many years and still picks up from time to time. He studied musicology as a college undergraduate in Germany before realizing he was more interested in the brain chemistry of how us humans perceive music rather than the technical nitty-gritty of musical composition and theory. So he became a neuroscientist, one with the perfect background for Koh’s study.

Duke University professors conduct an experiment on a professional violinist that explains the science behind the brain’s ability to process music.
For Overath, the chance to study the working brain of a professional musician of Koh’s caliber was a rare opportunity, and his students will benefit as well. He and Lindroth will discuss the results derived from Koh’s scan in class.
“It certainly plays into the course content,” said Lindroth, a composer. “We’ll have a whole class on the ways the brain is engaged with the physical and auditory dimensions of musical performance. It’s especially wonderful that our students will have a personal connection to Jennifer from her visit to our class earlier in the semester.”
ABOUT THIS NEUROSCIENCE AND MUSIC RESEARCH
Funding: The study has received funding from Lund University, as well as the European Research Council (ERC), the Swedish Research Council (VR), the Marianne and Marcus Wallenberg Foundation and Region Skåne (through so-called ALF grants).
Source: Eric Ferreri – Duke University
Image Credit: The image is credited to Duke University.
Video Source: The video is credited to Duke University.

Sunday, August 3, 2014

Functional Neuroimaging’s Neymar Problem: Expert's brain activation

reposted from

Functional Neuroimaging’s Neymar Problem

By Neuroskeptic | July 31, 2014 4:26 pm
As a “World Cup tie in post” this one’s a bit late, but here’s a story that’s been getting a lot of attention: According to scientists, Neymar uses instinct and not his brain when playing football
soccer_brain
Yes, if you believe the headlines, research has shown that legendary Brazilian forward Neymar da Silva Santos is so good, he can play with his brain switched off.
What’s the reality? The research in question used fMRI and it was published in Frontiers in Human NeurosciencesEfficient foot motor control by Neymar’s brain, by Eiichi Naito and Satoshi Hirose. The free full text ishere.
Anyway, the study didn’t quite find Neymar to be some kind of brainless soccer zombie, but the results were remarkable nonetheless. Naito and Hirose write:
We scanned Neymar’s brain activity while he rotated his right ankle. We also scanned three other professional footballers, two top swimmers, and one amateur footballer, all of whom performed the identical task.
We found activations in the left foot motor cortex regions during the foot movements in all participants. However, the size and intensity of [foot motor cortical] activity was smaller in the four professional footballers than in the three other participants, and Neymar’s activity was smallest of all.
In other words, while performing a football-related motor task (ankle rotation), the pro footballers showed less neural activity than other athletes. And Neymar, one of the best players in the world, showed the least brain activity.
This study was just about one very simple movement – so the headlines claiming that Neymar uses less brainpower to play football were extrapolating wildly. There’s more to soccer than twitching your ankle. Nonetheless, the basic paradox remains – we see less brain activity in people with more expertise.
This is not a new discovery, but Naito and Hirose provide a great illustration of the phenomenon, which one might call the Neymar Effect.
For me, the Neymar Effect is a deeply disturbing one, because it seems to undermine the logic of many fMRI studies. Suppose you scan some patients with a disorder, and some healthy people, performing some task. You find that on average the patients show reduced activity in a certain area, compared to the controls. What does that mean?
The intuitive interpretation is that less activity in a brain region means lessengagement of that brain region’s function. So if the region’s function is ‘memory’, say, it would be natural to read reduced activity as less remembering. The results mean that the patients are not remembering as well as the controls are.
In other words, it is natural (and very common) to start from neural activity and draw conclusions about psychological processes. A swathe of the fMRI literature is based on this approach. But the Neymar Problem is that any given dampening (or excess) of activity could just as easily reflect more (less) efficient processing, rather than less (more) processing per se. So the inference from activity to psychology is invalid.
This is a separate issue from the fallacy of reverse inference, which concerns how we ascribe ‘functions’ to brain regions. The Neymar Effect means that even if our assumptions about the localization of function are unerring, we still might go astray when it comes to interpreting quantitative differences in activity.
ResearchBlogging.orgEiichi Naito, & Satoshi Hirose (2014). Efficient foot motor control by Neymar’s brain Front. Hum. Neurosci.