Verification is the use of goal-factored production rules as a means of selection. Our knowledge of how the brain works is still so rudimentary that is seems premature to ban reference to production rules and other symbolic entities such as labeled links. Moreover, the line between production rules and many connectionist constructs is rather thin. For example, production rules without variables can easily be implemented using a connectionist network. Furthermore, proposals have been made for how a connectionist system may achieve variable binding, in effect implementing production rules with variables.
Production rules mean nothing more than the operations that they specify.
Securing task-relevant control in spoken word production.