Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, May 26, 2009, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Angelika Steger

Synchrony and Asynchrony in Neural Networks

In this talk we pick up on a model described recently by DeVille and Peskin (Bulletin of Mathematical Biology, to appear) for a stochastic pulsecoupled neural network. The key feature and novelty in their approach is that they describe the interactions of a neuronal system as a discrete-state stochastic dynamical network. They show (experimentally and by some estimates in an associated mean-field limit of the model) that their network can exhibit both synchronous and asynchronous behavior. They also exhibit a range of parameters for which the network switches seemingly spontaneously between synchrony and asynchrony. In synchronous behavior the firing of one neuron leads to the firing of other neurons, which in turn may set off a chain reaction that often involves a substantial proportion of the neurons. There are strong analogies to the giant component phenomenon in random graph theory.

In this talk we present a rigorous analysis of the model of DeVille and Peskin thereby answering in particular their questions about the actual parameter settings resp. thresholds for which these changes between synchronous and asynchronous behavior occur. We also provide insights into the coexistence of synchronous and asynchronous behavior and the conditions that trigger a 'spontaneous' transition from one state to another.

Joint work with Fabian Kuhn, Konstantinos Panagiotou, and Joel Spencer.


Upcoming talks     |     All previous talks     |     Talks by speaker     |     Upcoming talks in iCal format (beta version!)

Previous talks by year:   2018  2017  2016  2015  2014  2013  2012  2011  2010  2009  2008  2007  2006  2005  2004  2003  2002  2001  2000  1999  1998  1997  1996  

Information for students and suggested topics for student talks


Automatic MiSe System Software Version 1.4803M   |   admin login