What Is Memory that It May Have Hindsight and Foresight as well? - Understanding Understanding: Essays on Cybernetics and Cognition - page 111

FIGURE 2. The components of a mnemon. “The classifying cell records the occur-
rence of a particular event. It has two outputs, producing alternative possible motor
actions. The system is biased to one of these (say 'attack'). Following this action
signals instigating its result arrive and either reinforce what was done or produce
the opposite action. Collaterals of the higher motor cells then activate the small
cells, which produce inhibitory transmitter and close the unused pathway. These may
be called “memory cells” because their synapses can be changed.” (Reproduced with
kind permission from J.Z. Young 16 ).