Logical neural networks (LNN) are based on simple processing units. These basic units have the ability to memorize input-output pairs. The logical model does not claim to implement the biological neural system. The basic unit in the logical approach is not a direct model of a neuron cell.
In the following section an adaptive node (AN) as a simple processing unit is introduced. The AN may be associated with a cluster of neurons or in special cases with a single neuron.