Effects of topology and delayed connections in a neuronal network

  • IFISC Seminar

  • Toni Perez
  • IFISC
  • May 6, 2009, 3 p.m.
  • IFISC Seminar Room
  • Announcement file

As important as the intrinsic properties of an individual nervous cell
stands the network of neurons in which it is embedded and by virtue of
which it acquires great part of its responsiveness and functionality. In
this study we have explored how the topological properties and
conduction delays of several classes of neural networks affect the
capacity of their constituent cells to establish well-defined temporal
relations among their firing of action potentials. This ability of a
population of neurons to produce and maintain a millisecond-precise
coordinated firing (either evoked by external stimuli or internally
generated) is central to neural codes exploiting precise spike timing
for the representation and communication of information. Our results,
based on extensive simulations of Hodgkin-Huxley type of neurons in an
oscillatory regime, indicate that only certain topologies of networks
allow for a coordinated firing at a local and long-range scale
simultaneously. Besides network architecture, axonal conduction delays
are also observed to be another important factor in the generation
coherent spiking. We report that such communication latencies not only
set the phase difference between the oscillatory activity of remote
neural populations but determine whether the interconnected cells can
set in any coherent firing at all. In this context, we have also
investigated how the balance between the network synchronizing effects
and the dispersive drift caused by inhomogeneities in natural firing
frequencies across cells is resolved. Finally, we show that the observed
roles of conduction delays and frequency dispersion are not particular
to canonical networks but experimentally measured anatomical networks
such as the macaque cortical network can display the same type of behavior.


Contact details:

Damià Gomila

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