The latest standard distribution of NEURON is version 7.3, which is now (April 2013) availiable from http://www.neuron.yale.edu/neuron/download, allows reaction-diffusion in one dimension to be specified using Python classes and methods described in the new Programmer's Reference under Programmatic Model Specification / Basic Reaction-Diffusion. Also, a tutorial on how to use this new feature has been added to http://www.neuron.yale.edu/neuron/docs.
This is a very active area in NEURON development, and we are working to extend it to two- and three-dimensional reaction-diffusion. Previously it was necessary to use NMODL for reaction-diffusion. We expect that interpreter-based specification of reaction-diffusion will eventually replace this application of NMODL.
Extending NEURON to handle reaction-diffusion problems.
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