1. A learning aid system for teaching and testing associations between pictorial representations and correct responses to said pictorial representations, said system comprising: a plurality of pictorial representations to which operator responses are desired, each of said pictorial representations having an intended appropriate operator response different from the others; means for identifying one of said plurality of pictorial representations to which an operator response is desired; memory means independent of said plurality of pictorial representations and storing respective correct responses associated with each of said pictorial representations; operator input means for receiving an input from an operator of the learning aid system as a proposed response to the selected one of said plurality of pictorial representations; comparator means operably associated with said operator input means and said memory means for comparing the input received by said operator input means from the operator with the correct response stored in said memory means for said selected one of said plurality of pictorial representations and for providing an output indicative of the comparison therebetween; and presentation means responsive to the output of said comparator means for producing a presentation for comprehension by the operator indicative of the appropriateness of the input received by said operator input means with respect to said selected one of said plurality of pictorial representations.