Dynamics of Mammalian Visual Cortex: Challenges in Computational and Mathematical Modeling

Monday, May 13, 2013 - 11:30am - 12:20pm
Keller 3-180
Lai-Sang Young (New York University)
I will report on recent work which proposes that the network dynamics
of the mammalian visual cortex are neither homogeneous nor synchronous but
highly structured and strongly shaped by temporally localized barrages of
excitatory and inhibitory firing we call `multiple-firing events' (MFEs).
Our proposal is based on careful study of a network of spiking neurons built to
reflect the coarse physiology of a small patch of layer 2/3 of V1. When
appropriately benchmarked this network is capable of reproducing the
qualitative features of a range of phenomena observed in the real visual cortex,
including orientation tuning, spontaneous background patterns, surround
suppression and gamma-band oscillations. Detailed investigation into the
relevant regimes reveals causal relationships among dynamical events driven
by a strong competition between the excitatory and inhibitory populations.
Testable predictions are proposed; challenges for mathematical neuroscience
will also be discussed. This is joint work with Aaditya Rangan.
MSC Code: