1951 年 2 巻 p. 186-193
1. Behaviors and EEG's of rat were examined in a simple T-maze learning.
2. Small fast waves increased in EEG when the performance of conditioned behavior was repeated many times with reward. In this period, the rat showed the excited patterns (excited period). When the performance was repeated further, average frequency of EEG decreased and the rat showed depressed state (inhibited or fatigued period). In this period, 6-8 per sec. large waves (in drowsy state) and small fast waves (in awaked state) appeared alternately.
3. In the last period of extinction, the average frequency decreased and the rat showed rather inhibited behavior.
4. Increase of the small fast waves was noted in the EEG of a neurotic rat.
5. EEG during running showed augmentation of the basic waves just before or immediately after the rat started and it continued until the rat ran over the choice point, and it was replaced by increase of the small fast waves as the rat approached the goal. These EEG alterations during running were not noticed in the fatigued period, in the last period of extinction and in the neurotic state.
6) It was discussed about the cerebral excitatory level (or background excitation level) of rat in various states of behavior mentioned above on the basis of EEG alterations.