Feb
21
Mi
Felix Effenberger (FIAS, Germany): Understanding dendritic branching statistics using maximum entropy models
Feb 21 @ 16:30 – 17:30

Dendrite morphology is known to play an important role for neural computation and cells of the same class typically express characteristic properties in their dendritic structures, despite the fact that no two dendrites are exactly the same. In an attempt to capture those properties, a considerable number of different statistics for dendritic tree structures have been proposed over the last decades. Yet, their statistical power, e.g. for clustering neurons into well-known cell classes remained limited. Using a large data set of reconstructed dendritic trees from different species and brain regions, we give an overview of the commonly considered statistics and show that many of them are highly correlated, explaining their weak power in classification tasks. We furthermore devise simple maximum entropy null-models based on optimization principles already postulated by Ramon y Cajal that are able to explain in most cases both the observed distributions and pairwise correlations of common branching statistics. We conclude by presenting a number of novel statistics based on tree structure via centripetal branch orderings (Strahler numbers) and discuss what these
observations could mean for the configuration space occupied by dendritic trees. This is joint work with Hermann Cuntz.

Feb
22
Do
Conference: TAGS – Linking Topology to Algebraic Geometry and Statistics (day 4)
Feb 22 @ 08:30 – 17:30

More information you can find on the conference homepage:

https://www.mis.mpg.de/calendar/conferences/2018/tags2018/index.html

Feb
23
Fr
Conference: TAGS – Linking Topology to Algebraic Geometry and Statistics (day 5)
Feb 23 @ 08:30 – 17:00

More information you can find on the conference homepage:

https://www.mis.mpg.de/calendar/conferences/2018/tags2018/index.html

Jahrestagung der Stiftung Benetictus Gotthelf Teubner
Feb 23 @ 15:00 – 17:00

Verleihung des Wissenschaftspreises der Teubner-Stiftung zur Förderung der Mathematischen Wissenschaften 2018 an Herrn Professor Dr. Jürgen Jost (Direktor des MPI für Mathematik in den Naturwissenschaften)

Feb
26
Mo
Paul Breiding (MPI MIS, Leipzig): The spectral norm of tensors and quantum entanglement
Feb 26 @ 09:00 – 10:00
Tobias Fritz (MPI MIS, Leipzig): Type theory, programs-as-proofs and computer verification
Feb 26 @ 14:00 – 15:30
Feb
27
Di
Amy Wiebe (University of Washington): The Slack Realization Space of a Polytope
Feb 27 @ 10:00 – 11:00
Antonio Lerario (SISSA, Trieste): Topology of intersection of real quadrics
Feb 27 @ 11:00 – 12:00
Omri Tal (MPI MIS, Leipzig): Information Theory in Biology: Past and Recent Results
Feb 27 @ 15:00 – 16:30

There have been many attempts at applying ideas and methods from Information Theory in the biosciences, ever since Shannon first laid out the his theory of communication in engineering, to most recent times in an accelerated swing. Much of this has concerned modeling bio-communication, evolutionary processes in uncertain conditions, learning mechanisms in organisms and new approaches of analysis of high-throughput genetic data. This talk will be an informal review of both the very early reactions by biologists and some of the more recent interesting and sometimes controversial claims and results.

to be announced
Feb 27 @ 15:30 – 19:00
Letzte Änderung: 15. Mai 2013