Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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BCCN AG-Seminar

Tuesday, 13.12.2005 16 c.t.

Activity propagation in neural fields involving transmission delay and external stimuli

by Dr. Axel Hutt
from Applied Stochastic Processes, Institute of Physics, Humboldt University at Berlin

Contact person: Fred Wolf

Location

Seminarraum Haus 2, 4. Stock (Bunsenstr.)

Abstract

The investigation of macroscopic brain activity, as encephalographic signals or local field potemtials, plays an important role in the neuropsychology and are supposed to reflect the activity of neural populations. Thus in order to understand information processing in the brain, it is necessary to examine the space-time activity of neural populations, whose activity is strongly related to macroscopic experimental data. The presented work examines an Amari-like neural field model and presents the effects of spatial nonlocal interactions in neural populations while involving general synaptic connectivities and axonal transmission delay. The effects of external constant stimulation, random fluctuations and spatiotemporal stimuli are studied. We find space-time instabilities, traveling fronts, stimulus-evoked propagating pulses and noise-retarded phase transistions.

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