3: Networks

3.1: Introduction
The cerebral cortex or neocortex is composed of roughly 85% excitatory neurons and 15% inhibitory interneurons. We focus primarily on the excitatory pyramidal neurons, which perform the bulk of the information processing in the cortex. Unlike the local inhibitory interneurons, they engage in long-range connections between different cortical areas, and it is clear that learning takes place in the synapses between these excitatory neurons.
3.2: Biology of the Neocortex
3.3: Categorization and Distributed Representations
3.4: Bidirectional Excitatory Dynamics and Attractors
3.5: Inhibitory Competition and Activity Regulation
3.6: SubTopics and Explorations