The use of various kinds of teaching materials and aids as media of learning, and their relationship to the effectiveness in learning were examined through several experimental lessons. In our overall examination, the following have been noticed as general tendencies : In the lessons through the textbook, Ianguage was learned precisely and easily ; an improvement was shown in the grasp and memorization of the ideas and theories explained in words Symbolic Grasp. In the lessons in which slides and OHP's were used, the grasp and memory through images-lconic Grasp-were improved. In the lessons conducted through the observation of objects, a notable tendency was shown in the grasp and memorization of the contents of the lesson concretely, substantively, in their actual state, and as a whole-Concrete Grasp. In the lessons through practice, the grasp and memory through operation-Enactive Grasp-were improved.
The tendencies shown above-the "tendencies of the contents or qualities of the information contained in the teaching materials and aids-Media of Learning-to be learned (or recognized) easily " we call the "dommant tendency of the learning (or recognrtron) of particular form of information (stimulus) through receptors."
In this paper, I would like to make a report of the results of our experiments in these researches.