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A more flexible window into the brain
Date:11/13/2011

ten times fewer wires.

Monitoring and studying the brain's constant electrical activity, or to alter it when it goes awry, often requires the placement of electrodes deep within specific regions of the brain. These currently used devices can be clumsy and of low resolution, and those used for neuromotor prostheses can cause tissue inflammation and hemorrhages.

Study collaborators including lead author Jonathan Viventi, PhD, an assistant professor at the Polytechnic Institute of New York University who worked with Litt on the project as a postdoctoral fellow at Penn, and colleagues John Rogers from the University of Illinois Urbana-Champaign, and Dae-Hyeong Kim from Seoul National University, worked together to conceive and build the array, believed to be the first device of its kind to be used as a brain interface.

In animal models, researchers observed responses to visual stimuli and recorded previously unknown details of sleep patterns and brain activity during epileptic seizures. The array recorded spiral waves during seizure activity that have not been previously recorded in whole brain. These patterns are similar to those seen in the heart during ventricular fibrillation, raising the possibility of fighting epilepsy with some of the same methods used to treat cardiac arrhythmias, like focal destruction or ablation of abnormal circuits.

The observation of spiral wave activity also served to highlight the extreme sensitivity and resolving capacity of this new active array, which was able to easily distinguish normal signal patterns from abnormal waves even in the same frequency ranges. The activity recorded by Litt's research team has enormous implications not only for controlling seizures but for understanding and treating disorders of other brain processes affecting sleep, memory, and learning, and for the characterizing and treating chronic pain, depression, and other neuropsychological disorders.

Ultimately, the
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Contact: Kim Menard
kim.menard@uphs.upenn.edu
215-662-6183
University of Pennsylvania School of Medicine
Source:Eurekalert

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