• Briefly describe an IAC network, paying attention to:

    1. competitive pools
    2. inhibitory and excitatory connections
    3. the output function of a unit in an IAC net

    Solution: An IAC network is a collection of nodes and weighted connections, normally bidirectional connections.

    The nodes are divided into competitive pools. All the interconnections between nodes in any pool are inhibitory; i.e. their weights are negative.

    Connections between nodes in different pools, when they exist, are excitatory connections - i.e. the weights are positive. (Nodes are unconnected iff the weights are zero.)