In this thesis, the influence of noise, variability, and time-delayed feedback
on the dynamics of nets of neural elements is investigated. The dynamics of
the single elements is given by the FitzHugh-Nagumo, the Hodgkin-Huxley,
or the reduced Hodgkin-Huxley equations. After some theoretical basics, the
results are presented. For oscillatory nets, it is shown that time-delayed feedback
can suppress oscillations and thereby excitable net dynamics is induced.
In subexcitable nets, time-delayed feedback can support the propagation of
wave fronts and thereby pattern formation. This effect is...