Figure 2.

Mechanisms relying on up/down neurons to gate information transmission between two cortical neuron sets. (A) Individual gating of B-set neurons. (B) Simultaneous gating of all B-set neurons. (C) Simultaneous gating of all A-set neurons. Projections labeled “*” carry action potentials from A-set neurons to B-set neurons. Projections labeled “G,” when active, shift up/down neurons to their up state (see text). The neuron symbols represent either individual cortical neurons, or small, interconnected assemblies of cortical neurons exhibiting similar responses (see text).