| || Models ||Description|
Learning spatial transformations through STDP (Davison, Frégnac 2006)
||A common problem in tasks involving the integration of spatial information from multiple senses, or in sensorimotor coordination, is that different modalities represent space in different frames of reference. Coordinate transformations between different reference frames are therefore required. One way to achieve this relies on the encoding of spatial information using population codes. The set of network responses to stimuli in different locations (tuning curves) constitute a basis set of functions which can be combined
linearly through weighted synaptic connections in order to approximate non-linear transformations of the input variables. The question then arises how the appropriate synaptic connectivity is obtained.
This model shows that a network of spiking neurons can learn the coordinate transformation from one frame of reference to another, with connectivity that develops continuously in an unsupervised manner, based only on the correlations available in the environment, and with a biologically-realistic plasticity mechanism (spike timing-dependent plasticity).
Networks of spiking neurons: a review of tools and strategies (Brette et al. 2007)
||This package provides a series of codes that simulate networks of spiking neurons (excitatory and inhibitory, integrate-and-fire or Hodgkin-Huxley type, current-based or conductance-based synapses; some of them are event-based). The same networks are implemented in different simulators (NEURON, GENESIS, NEST, NCS, CSIM, XPP, SPLIT, MVAspike; there is also a couple of implementations in SciLab and C++).
The codes included in this package are benchmark simulations; see
the associated review paper (Brette et al. 2007). The
main goal is to provide a series of benchmark simulations of
networks of spiking neurons, and demonstrate how these are implemented in the
different simulators overviewed in the paper. See also details in the
enclosed file Appendix2.pdf, which describes these different
benchmarks. Some of these benchmarks were based on the
Vogels-Abbott model (Vogels TP and Abbott LF 2005).
Olfactory Bulb Network (Davison et al 2003)
||A biologically-detailed model of the mammalian olfactory bulb, incorporating
the mitral and granule cells and the dendrodendritic synapses between them.
The results of simulation experiments with electrical stimulation agree
closely in most details with published experimental data. The model predicts
that the time course of dendrodendritic inhibition is dependent on the
network connectivity as well as on the intrinsic parameters of the synapses.
In response to simulated odor stimulation, strongly activated mitral cells
tend to suppress neighboring cells, the mitral cells readily synchronize
their firing, and increasing the stimulus intensity increases the degree of
synchronization. For more details, see the reference below.