Magnetic resonance images of the human brain. Researchers of the Jena University and the Jena University Hospital discovered that the visual processing of numbers takes place in both hemispheres of the brain. Credit: Jan-Peter Kasper/FSU
Researchers have located an important region for the visual processing of numbers in the human brain and showed that it is active in both hemispheres. The scientists published high resolution magnetic resonance recordings of this region. The human brain works with division of labour. Although our thinking organ excels in displaying amazing flexibility and plasticity, typically different areas of the brain take over different tasks.
While words and language are mainly being processed in the left hemisphere, the right hemisphere is responsible for numerical reasoning. According to previous findings, this division of labour originates from the fact that the first steps in the processing of letters and numbers are also located individually in the different hemispheres. But this is not the case, at least not when it comes to the visual processing of numbers.
Neuroscientists of the Friedrich Schiller University Jena and of the Jena University Hospital discovered that the visual processing of numbers takes place in a ‘visual number form area’ (NFA)– in fact in both hemispheres alike. High resolution MR recordings showing the activity in this region of the brain of healthy test persons.
In their study they presented subjects with numbers, letters and pictures of everyday objects. Meanwhile the participants’ brain activity was recorded using MRI. The small area at the underside of the left and right temporal lobe reacted with increased activity at the presentation of numbers. Letters and other images but also false numbers lead to a significantly lower brain activity in this area.
“This region has been a kind of blind spot in the human brain until now,” Mareike Grotheer says. And here is why: Hidden underneath the ear and the acoustic meatus, surrounded by bone and air, previous MRI scans showed a number of artefacts and thus obstructed detailed research.
For their study the Jena scientists used a high-performance 3 tesla MRI scanner of the Institute of Diagnostic and Interventional Radiology (IDIR) of the Jena University Hospital. They recorded 3D images of the brain of the test subjects at an unusually high spatial resolution and hence with only very few artefacts. In addition these recordings were spatially smoothed whereby the remaining ‘white noise’ could be removed. This approach will help other scientists to investigate a part of the brain that until now had been nearly inaccessible. “In this region not only numbers are being processed but also faces and objects,” Prof. Kovács states. http://www.uni-jena.de/en/Research+News/FM160127_number_form_area_en.html
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