How do I use the raster program to make cell firing activity raster plots?
Unfortunately, the term “raster” suffers from overload, and means different things in different contexts, which leads to confusion. Even in electrophysiology it has two different meanings: a) a “waterfall” plot of triggered sweeps of data, plotted front to back with an offset and optional hidden line removal; and b) a graph of action potential positions, with each line in the graph representing a different cycle, and with each dot marked on the line indicating the action potential position within that cycle. The raster program in our software suite produces the first type of raster plot, not the second. You can produce the second type within the analysis program, using the graph of action potential position vs cycle (or the sorted version of this). For this analysis, it helps to turn off the Normalization option, and turn on the Display cycle activity option, so you can see the varying cycle lengths and how the spikes line up with them. You can also produce a waterfall plot of waveform
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