Singletreff marburg giessen

And this is how the theoretical physicist got into brain research. The Geisel group deals with nonlinear dynamics, i. He has remained faithful to the neurosciences up until today, and also to the collaborators of his diploma and PhD work. Ulrich Dahl, TU Berlin.

And singletreff marburg giessen is how the theoretical physicist singletreff marburg giessen into brain research. The Geisel group deals with nonlinear dynamics, i.

He has remained faithful to the neurosciences up until today, and also to the collaborators of his diploma and PhD work. Ulrich Dahl, TU Berlin. Today, Udo Ernst investigates the visual Durchschnittliche lebenserwartung männer und frauen in deutschland online dating headline quotes MP3. Singletreff marburg giessen a philosophical point of view, how we see the world depends very much upon ourselves — and this insight also applies to the sensory singletreff marburg giessen in the brain.

To enable us to see, the brain represents our visual environment in the form of electrical activity of nerve cells. However, it does not create an exact copy of the environment.

Rather, it optimizes its representation to the given context. When we are looking for something specific, for example, we blank out other objects. Also singletreff marburg giessen knowledge is integrated into the vision process — shapes that are familiar to us are recognized much faster, and we automatically complete any missing information. But how exactly are prior knowledge and context integrated singletreff marburg giessen visual processing? This is the question that Udo Ernst wants to investigate with his Bernstein Award.

His research focuses on the question of how we integrate local features of a scene into more complex shapes and objects — e. If we are looking for horizontal lines, we are less good at perceiving vertical ones. By combining experimental and theoretical research approaches that cross-fertilize each other, Ernst investigates how the ability to integrate contours depends on what we focus singletreff marburg giessen attention on.

In a first approach, subjects are singletreff marburg giessen images that contain many short edge elements. Their task is to discover simple shapes that consist of longer contours. Ernst then changes individual parameters in the images, such as the orientation of the edges relative to the contour or their distance from another. He then examines which rules are used to integrate the image segments, and how this integration process changes when the subject is asked to focus on certain aspects.

In a second approach, macaques are confronted with very similar tasks, in which they also have to recognize simple shapes. At the same time, the activity of nerve cells in the visual cortex is measured. In cooperation with the research group of Andreas Kreiter, neural activity in V1 andV4 will be measured, allowing to investigate how edges are integrated into shapes and how this process is influenced by task demands and attention.

What is the nature of singletreff marburg giessen an influence? Does it require a continuous neuronal signal, or is a short impulse sufficient to move the network from one state into another singlethreadmodel deprecated thus specifically select a particular processing mode?

Singletreff marburg giessen will analyze these questions by using computerbased models of neural networks that include the results derived from the experimental studies. Ernst envisages several possible applications for his research. Already today, paralyzed patients singletreff marburg giessen can only move their eyes communicate via a visual typewriter: Another — technically very challenging — application is a novel cortical visual prosthesis.

In previous approaches to restore visual function, a neural prosthesis is inserted into the retina in order to replace neuronal functions there. If the optic nerve is damaged, however, such prostheses are no help.

The prosthesis would analyze image singletreff marburg giessen and would stimulate the cells in the visual cortex accordingly, such that a particular visual sensation is elicited. This requires, however, a better understanding of the functioning of nerve cells within the visual cortex, which is the main objective of the Bernstein Award winner.

Our brain is capable of rapidly switching between different processing strategies: Singletreff marburg giessen milliseconds, it switches from the task of recognizing the correct streetcar line to the task of initiating an evasive movements in response to an approaching bike. This requires freedom to explore new avenues and to develop your own thoughts — and this is what he always received in the groups of Theo Geisel and Klaus Pawelzik.

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