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Max Planck Florida Institute Scientists Create First Realistic 3D Reconstruction of a Brain Circuit

12-10-2011 09:07 AM CET | Science & Education

Press release from: Tartaglia Communications

/ PR Agency: Tartaglia Communications
Contact: Dennis or Sheila Tartaglia
Tartaglia Communications
(732) 545-1848

info@tartagliacommunications.com

For Immediate Release

Max Planck Florida Institute Scientists Create First Realistic
3D Reconstruction of a Brain Circuit

Six Years of Work by Numerous Scientists Yields Important Milestone Toward
3D Model of the Brain

Jupiter, FL, December 8, 2011 – Researchers from the lab of Nobel laureate Bert Sakmann, MD, PhD at the Max Planck Florida Institute (MPFI) are reporting that, using a conceptually new approach and state-of-the-art research tools, they have created the first realistic three-dimensional diagram of a thalamocortical column in the rodent brain. A vertically organized series of connected neurons that form a brain circuit, the cortical column is considered the elementary building block of the cortex, the part of the brain that is responsible for many of its higher functions.
This achievement is the first step toward creating a complete computer model of the brain, and may ultimately lead to an understanding of how the brain computes and how it goes awry in neurological, neurodevelopmental and psychiatric disorders. The study is published online in the journal Cerebral Cortex.

“This is the first complete 3D reconstruction of a realistic model of a cortical column,” said Marcel Oberlaender, PhD, first author on the paper. “This is the first time that we have been able to relate the structure and function of individual neurons in a live, awake animal, using complete 3D reconstructions of axons and dendrites. By creating this model, we hope to begin understanding how the brain processes sensory information and how this leads to specific behaviors.”
The electrically excitable axon extends from the body of the neuron (brain cell) and often gives rise to many smaller branches before ending at nerve terminals. Dendrites extend from the neuron cell body and receive messages from other neurons.

In addition to recreating the structure of the cortical column, the study also sheds significant light on the function of its constituent neurons, and the relationship between their functionality and structure. In looking at neurons’ response to sensory stimulation, the researchers discovered that sensory-evoked activity in some of the cells can be directly correlated with their structure and connectivity, which marks a first step toward understanding basic organizational principles of the brain.

Working with both awake and anesthetized rats, and also examining stained brain slices, the neuroscientists used sophisticated new light microscopy as well as custom designed tools to examine 15,000 neurons of nine identified cell types. Using a painstaking, six-step process, the researchers identified and reconstructed the column’s constituent parts using sophisticated software and a range of other new state-of-the-art tools and processes.

Described in a related paper co-authored by Drs. Sakmann and Oberlaender, these new methods, which were developed in part at the Max Planck Florida Institute, allow researchers, for the first time, to simulate electrical signaling in a computer model at subcellular and millisecond resolution.

“We can now quantify the number of neurons of each cell type, their three-dimensional structure, connectivity within these networks, and response to sensory stimulation, in both an anesthetized and awake animal,” said Dr. Oberlaender. “Such a quantitative assessment of cortical structure and function is unprecedented and marks a milestone for future studies on mechanistic principles that may underlie signal flow in the brain, during such functions as decision making.”

Dr. Oberlaender is part of the Max Planck Florida Institute’s Digital Neuroanatomy group, led by Dr. Bert Sakmann. The group focuses on the functional anatomy of circuits in the cerebral cortex that form the basis of simple behaviors (e.g. decision making). One of the group’s most significant efforts is a program dedicated to obtaining a three-dimensional map of the rodent brain. This work will provide insight into the functional architecture of entire cortical areas, and will lay the foundation for future studies on degenerative brain diseases, such as Alzheimer's.

Dr. Oberlaender and Dr. Christiaan de Kock contributed equally to this work. Dr. de Kock is with the Neuroscience Campus Amsterdam, VU University Amsterdam, the Netherlands. The research team also included scientists from Max Planck Institute for Medical Research (Heidelberg, Germany), Columbia University and Zuse Institute (Berlin).

About the Max Planck Florida Institute
The first institute established by Germany’s prestigious Max Planck Society outside of Europe, the Max Planck Florida Institute is also the first research institute of its kind in North America. MPFI seeks to provide new insight into understanding the functional organization of the nervous system, its capacity to produce perception, thought, language, memory, emotion, and action. Neural circuits, the complex synaptic networks of the brain, hold the key to understanding who we are, why we behave the way we do, and how the debilitating effects of neurological and psychiatric disorders can be ameliorated. MPFI meets this challenge by forging links between different levels of analysis—genetic, molecular, cellular, circuit, and behavioral—and developing new technologies that make cutting edge scientific discoveries possible. For more information, visit www.maxplanckflorida.org.

Tartaglia Communications is a full-service public relations firm that specializes in developing strategic communications solutions for health, science and nonprofit organizations of all types and sizes. The firm provides personalized service, high-level strategic insight, and the results-oriented approach that clients in these sectors need to achieve their communications objectives in a cost-effective manner.

Dennis and Sheila Tartaglia
Tartaglia Communications
P.O. Box 5148
Somerset, NJ 08875-5148

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