Uni-Logo
You are here: Home Talks & Events Bernstein Seminar Bernstein Seminar - Andreas Draguhn (Heidelberg University)

Bernstein Seminar - Andreas Draguhn (Heidelberg University)

— filed under:

"Oscillating hippocampal networks – patterns, mechanisms and potential ‘meaning’ of cooperative neuronal activity" / Tuesday, January 16, 2018 17:15 h

What
  • Bernstein Seminar
When Jan 16, 2018
from 05:15 PM to 06:45 PM
Where BCF Lecture Hall, Hansastr. 9a
Add event to calendar vCal
iCal
You have a new invitation for the Bernstein Seminar on 16 January 2018!
 

January 16, 2018

 
 
Featured images
 
 
 

Institute of Physiology and Pathophysiology

Heidelberg University

 
 
 
 
   
 
 
 

Tuesday, 16 January 2018

 

17:15 h

 

vCal iCal

 

 

Lecture Hall (ground floor)
Bernstein Center Freiburg
Hansastraße 9a
79104 Freiburg

 

Hosted by Ulrich Egert

 
 
 
 
 

Oscillating hippocampal networks – patterns, mechanisms and potential ‘meaning’ of cooperative neuronal activity

 

In almost all brain areas, neurons co-ordinate their activity in time, sometimes firing action potentials in strict synchrony, sometimes firing in sequences or in other temporal patterns. Of similar importance is the selection of active neurons: In any given situation, only a sub-set of local neurons is active while the remaining cells (usually the majority) stay silent. As a result, networks express defined spatiotemporal patterns of activity. Very often, the timing of neuronal activity is determined by underlying network oscillations which define a temporal framework for action potentials.
During past years, we have analyzed one important pattern of oscillations which contributes to memory formation in the rodent hippocampus: Sharp wave-ripple complexes. Here, activity of neurons is entrained by a synchronous network oscillation at ~200 Hz.
In the main section of the seminar, we will ask how single neurons are coupled to this fast rhythm and how others are silenced. Combining electrophysiological measurements, computer modelling and morphological analysis we found that the structure and function of axons plays a major role for the selective and temporally precise activation of pyramidal cells. Specifically, we found evidence for two mechanisms: i) electrical coupling between axons; ii) distal origin of axons which emanate from a basal dendrite, rather than from a soma. The first mechanism can, in principle, explain extremely fast signal transition between cells and percolation of high-frequency oscillations through neuronal networks. The second mechanism may explain how dendritic integration of synaptic inputs interacts with the fast, partially autonomous activity of axons. We then will briefly address important features of network oscillations at larger scales: Characteristics and plasticity of multi-neuronal spatiotemporal patterns in hippocampal networks, and large-scale oscillations which recruit major parts of the brain into coherent activity patterns.
Together, we aim at describing and understanding the generation of complex spatiotemporal activity patterns which, in turn, may be the network-level correlate of cognition and behavior.

 

Literature

Thome C, Kelly T, Yanez A, Schultz C, Engelhardt M, Cambridge SB, Both M, Draguhn A, Beck H, Egorov AV (2014) Axon-carrying dendrites convey privileged synaptic input in hippocampal neurons. Neuron 83:1418-1430. (Link)

Traub RD, Schmitz D, Maier N, Whittington MA, Draguhn A (2012) Axonal properties determine somatic firing in a model of in vitro CA1 hippocampal sharp wave/ripples and persistent gamma oscillations. Eur J Neurosci 36:2650-2660. (Link)

Bahner F, Weiss EK, Birke G, Maier N, Schmitz D, Rudolph U, Frotscher M, Traub RD, Both M, Draguhn A (2011) Cellular correlate of assembly formation in oscillating hippocampal networks in vitro. Proc Natl Acad Sci USA 108:E607-616. (Link)

Zhong W, Ciatipis M, Wolfenstetter T, Jessberger J, Müller C, Ponsel S, Yanovsky Y, Brankačk J, Tort ABL, Draguhn A (2017) Selective entrainment of gamma subbands by different slow network oscillations. Proc Natl Acad Sci U S A114:4519-4524. (Link)

Zylla MM, Zhang X, Reichinnek S, Draguhn A, Both M (2013) Cholinergic plasticity of oscillating neuronal assemblies in mouse hippocampal slices. PLoS One 8:e80718. (Link)

 

The talk is open to the public. Guests are cordially invited!

 

 
 
 

           UPCOMING TALKS

 

31-01-2018           Prof. Matthew Rushworth, University of Oxford, UK

13-02-2018           Prof. Julijana Gjorgjieva, MPI Brain Research

13-03-2018           Prof. Siegrid Löwel, Göttingen University

27-03-2018           Prof. Tomislav Milekovic, University of Geneve

 
 

                
 
 
 

BERNSTEIN CENTER FREIBURG
Hansastraße 9a
79104 Freiburg im Breisgau
 

Personal tools