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This tool implements the parallel-pathway and positive-feedback models of velocity storage, and the negative-feedback model of velocity leakage. Descriptions of the models are also in the tool.
FIGURE 2.6 shows two models of velocity storage in the primate vestibulo-ocular reflex (VOR) (A) In the parallel-pathway model, vestibular nucleus neurons (VN) pass the vestibular afferent (VA) signal to the motoneuron (MN) either directly or indirectly, through a leaky integrator. (8) In the feedback model, the vestibular nucleus
neuron that receives the vestibular afferent signal sends its output to the motoneuron
and also feeds back onto itself through a leaky integrator. Leaky integrators are
drawn as boxes to distinguish them from the other neural elements drawn as circles.
(Note that in our simulations leaky integrators are just like other neural units except
that they send excitatory, recurrent connections to themselves. Raphan and Robinson
used different methods to model leaky integrators.) (A after Raphan et aJ. 1979;
B after Robinson 1981.)
The two-unit network configured to implement the parallel-pathway model of velocity storage in the primate VOR: Input x connects to y1 and y2 with weights v1 and v2 , and unit y2 connects to unit y1 and to itself with weights w12 and w22 , respectively.
Figure 2.9 shows the two-unit network configured to implement the feedback model of velocity storage in the primate VOR. Input x connects to unit y1 with weight v1, unit y1 connects to y2 with weight w21, and unit y2 connects to y1 and to itself with weights w12 and w22, respectively.
This tool is built from the MATLAB scripts for Tutorial on Neural Systems Modeling by Thomas J. Anastasio.
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