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The Scientist And The Contortionist

Date:
June 4, 2007
Source:
Dartmouth University
Summary:
Watching a ballet dancer or circus acrobat perform, who hasn't winced at the thought of trying to replicate the impossible flexibility on display? One Dartmouth student, a neuroscience major, wondered what exactly is happening to the brain during this type of visceral response to someone else's physical state, so she cast about for a contortionist. The brain, her research suggests, responds the same whether a person is doing something or only imagining doing it.

Contortionist Christina Luccio '07
Credit: Photo courtesy Emilie Mackie

Watching a ballet dancer or circus acrobat perform, who hasn't winced at the thought of trying to replicate the impossible flexibility on display? Emilie Mackie '07, a neuroscience major, wondered what exactly is happening to the brain during this type of visceral response to someone else's physical state, so she cast about for a contortionist.

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Mackie, with fellow researcher Emily Cross, a fourth year graduate student in cognitive neuroscience, developed a research study designed to use transcranial magnetic stimulation (TMS), a type of neuroimaging, to determine how the brain responds to "impossible" visual scenarios using both inanimate objects—things like coffee mugs and umbrellas—and human beings. The objects were photographed using hidden supports to make them appear to defy gravity. In looking for a human being who could do the "impossible," Mackie and Cross were lucky enough to find Christina Luccio '07, a contortionist.

Luccio, an alumna of Circus Smirkus camp who has trained with former Cirque du Soleil artists, can contort herself into shapes that almost hurt just to watch, although, she says, the poses are not painful to her. Together, Luccio, Mackie and Cross came up with a series of poses, some that anyone could assume and others that would appear, Mackie hoped, "impossible" to the mind's eye.

Mackie recruited 20 healthy volunteers for the study and gave them all fMRI brain scans. Using the fMRI scans as a kind of road map, she applied TMS to localized areas of the brain while the volunteers looked at photos of Luccio in both normal and contorted poses and photos of objects in normal and "impossible" arrangements. The magnetic pulse of the TMS paddle modifies the activity in a small part of the brain, allowing Mackie to map the function of different parts of the brain as the subjects mentally respond to the photos. The experiment was designed, Mackie explains, to create a two-by-two matrix for comparison: human vs. object and possible vs. impossible.

Mackie and Cross hope to learn what is happening to the brain when it sees the impossible (or at least, the highly improbable), and their work is based, in part, on earlier studies showing a "mirroring effect" in the brain; that is, when people look at images of human behavior, their brain activity is similar to the activity that would appear if they themselves were actually doing the activity. The brain, this research suggests, responds the same whether a person is doing something or only imagining doing it.


Story Source:

The above story is based on materials provided by Dartmouth University. Note: Materials may be edited for content and length.


Cite This Page:

Dartmouth University. "The Scientist And The Contortionist." ScienceDaily. ScienceDaily, 4 June 2007. <www.sciencedaily.com/releases/2007/05/070530185624.htm>.
Dartmouth University. (2007, June 4). The Scientist And The Contortionist. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2007/05/070530185624.htm
Dartmouth University. "The Scientist And The Contortionist." ScienceDaily. www.sciencedaily.com/releases/2007/05/070530185624.htm (accessed October 31, 2014).

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