Fig. 1. The general structure of the network in immature (fig.1A) and in mature (fig.1B) phase.
The four projection areas make excitatory synapses with their target SC neurons and with their target interneurons (arrows). The interneurons provide two competitive mechanisms: 1) Ha and Hv provide the bases through which the inhibitory effect of AES is imposed on non-AES inputs; 2) Ia and Iv provide the substrate for a competition between two non-AES inputs in which the stronger one overwhelms the weaker.