Figure 7.

Alternative wiring with local inhibition and only excitatory cross-columnar projections. (A) Architecture with local inhibition functionally equivalent to Figure 1B. Inhibitory projections are now local to the column, and feedforward inhibition is achieved via cross-columnar excitatory projections onto the I populations. (B) Recall of a sequence composed of two 700ms intervals. Inset (bottom panel) zooms in on the activity at lower rates. As before, color codes for columns. Color shade represents populations in L₅ (light) and L_2/3 (dark), with solid curves denoting excitatory populations. Dashed (dotted) curves represent the inhibitory cells I_T (I_M).