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pat - or pattern files are used in Auryn to defined patterns as a subset of neurons of single NeuronGroup with associated activity (gamma) value between zero and one. They are a human readable exchange format and are understood by a range of Auryn objects. SparseConnection for instance implements a set of functions to load such pattern files as cell assemblies (or synfire chains) into the connection matrix.

See also PatternMonitor and StimulusGroup.

File structure

The first bit of a pat file could look like this:

# 2 blocks
# pattern 0
0 0.866623
1 0.742221
2 0.271302
398 0.208315 
399 0.123721 
 
 
# pattern 1 
400 0.972103 
401 0.057406

where the first column specifies the NeuronID and the second column the associated gamma value. Patterns are separated by 2 or more linebreaks. Comments can be added to the file and have to be marked with a leading #, which has to be the first character on a line.