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Oscillations and other patterns of neuronal activity arise throughout
the central nervous system. This activity has been observed in sensory
processing, motor activities, and learning, and has been implicated in
the generation of sleep rhythms, epilepsy, and parkinsonian tremor.
Mathematical models for neuronal activity often display an incredibly
rich structure of dynamic behavior. In this lecture, I describe how the
neuronal systems can be modeled, various types of activity patterns that
arise in these models, and mechanisms for how the activity patterns are
generated. In particular, I demonstrate how methods from geometric
singular perturbation theory have been used to analyze a recent model
for activity patterns in an insect's antennal lobe.