VERTICAL SIGNAL FLOW AND OSCILLATIONS IN A 3-LAYER MODEL OF THE CORTEX

A model of vertical signal flow across a layered cortical structure is presented and analyzed. Neurons communicate through spikes, which evo ke an excitatory or inhibitory postsynaptic potential (spike response model). The layers incorporate two anatomical features - dendritic and axonal arborization patterns and distance-dependent time delays. The vertical signal flow through the network is discussed for various stim ulus conditions using two different, but typical, axonal arborization patterns. We find stationary as well as oscillatory response, but the oscillatory response may be restricted to a single layer. Confronted w ith conflicting stimuli the network separates the patterns through pha se-shifted oscillations. We also discuss two hypothetical animals, to be called ''cat'' and ''mouse.'' These have different axonal arborizat ions, which give rise to a different oscillatory response (if any) of the various layers.