Model neurons used in the network.

<p>a) The dynamics of a model neuron coupled to a PSC model provides the complete model of a single cell. Spikes arrive, are filtered by a weighted post-synaptic current and then drive a spiking nonlinearity. b) Tuning curves for 40 simulated goldfish neurons with a cellular membrane time constant, , of ms and a refractory period of ms. Maximum firing rates were picked from an even distribution ranging from 20 to 100 Hz. Direction intercepts were picked from an even distribution between −50 and 50 degrees. The neurons were evenly split between positive and negative gains, determined by a randomly assigned encoding weight .