Abstract
The onset and propagation of waves in an excitable medium were investigated using the retinal Spreading Depression (rSD). The rSD is an ideal tool for this purpose. The retina of chickent, which was used in all experiments, is a close to two-dimensional system, in which the wave can easily be observed by optical techniques in time and space. rSD waves can be elicited by a variety of stimuli. Between stimulus and onset of the wave a temporal delay is always present. We found that the wave velocity is a function of the duration of this delay. In this paper we show, that within this time increasing fluctuations occur of system parameters.
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