===== External Input and Stimuli =====

In most cases you will want to give some external input. Auryn has multiple classes which allow you to give spiking or current input to your neurons in a network. The most simple form of external input comes in the form of a homogeneous population of Poisson neurons which fire at constant rate [[PoissonGroup]]. If you want the input population to have a spatial firing rate profile instead use [[ProfilePoissonGroup]]. To give Poisson input with temporally varying firing rates use [[FileModulatedPoissonGroup]]. The latter will read the firing rates from a time series file ([[tiser]]) which you supply in text format. Finally if you want to stimulate your network with time varying Poisson input from multiple sub-populations within the external Poisson neuron population [[StimulusGroup]] might be right pick for you. If you want more control just create a [[ras]] file in your favourite programming language (e.g. Python) and simply load it into the Auryn simulation from an external file using [[FileInputGroup]]. If that's not enough you can write highly specific input groups for different purposes; see for instance [[AuditoryBeepGroup]] for an example.