Brian is a free, open source simulator for spiking neural networks. It is written in the Python programming language and is available on almost all platforms. We believe that a simulator should not only save the time of processors, but also the time of scientists. Brian is therefore designed to be easy to learn and use, highly flexible and easily extensible.
To get an idea of what writing a simulation in Brian looks like, the following code defines a randomly connected network of integrate and fire neurons with exponential inhibitory and excitatory currents, runs the simulation and makes the raster plot on the right.
from brian2 import * eqs = ''' dv/dt = (ge+gi-(v+49*mV))/(20*ms) : volt dge/dt = -ge/(5*ms) : volt dgi/dt = -gi/(10*ms) : volt ''' P = NeuronGroup(4000, eqs, threshold='v > -50*mV', reset='v=-60*mV') P.v = -60*mV Pe = P[:3200] Pi = P[3200:] Ce = Synapses(Pe, P, on_pre='ge+=1.62*mV') Ce.connect(p=0.02) Ci = Synapses(Pi, P, on_pre='gi-=9*mV') Ci.connect(p=0.02) M = SpikeMonitor(P) run(1*second) plot(M.t/ms, M.i, '.') show() |
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Interactive demo
We also have an interactive demo (running on mybinder.org) that lets you modify parameters and even change the simulation code, running from the web browser without installing anything.
Getting started
Once you’ve decided you want to use Brian, you can click the links on the left hand side to install Brian, go through the tutorials, look at example code and read the full documentation. If you have problems, we have an email support list.
Other software and tools
We have produced the following tools in addition to the main Brian simulator:
- brian2tools: for simple plotting and analysis with Brian
You can also download the older version of Brian (1.4) and the toolboxes we designed for it:
- Brian Hears (compatible with Brian 2): for modelling the auditory system
- Model fitting toolbox: for automatically fitting models to electrophysiological data
How to cite Brian
If you use Brian for your published research, we suggest that you cite our article:
You can also download our logo for posters and presentations.
The Brian team
Brian is being developed by:
- Romain Brette (l’Institut de la Vision, Paris)
- Dan Goodman (Imperial College, London)
- Marcel Stimberg (l’Institut de la Vision, Paris)
See the team page for full credits.