Comparative Studies on the Brain-Waves of Various Animals in their Natural Resting States
1949 年 50 巻 3-4 号 p. 297-306
詳細
1949 年 50 巻 3-4 号 p. 297-306
In view of the circumstances that eeg of various animals have been studied with too different methods and under too different conditions to enable their comparative studies, the author tried to investigate them with one and the same method and under comparable natural conditions of man and animals, and obtained the following results:
1. The average amplitude of eeg taken from the scalp did not greatly differ in magnitude at man, dogs, cats, rabbits and guinea pigs.
2. The range of frequencies covered by the predominant waves was 8.4-11.9 cycles per sec. or Hz in man, 10-16 Hz in dogs and cats, 6-7 Hz in guinea pigs and 3-6 Hz in rabbits.
3. The correspondence among these main rhythms was studied from the phylogenetical point of view, and it could be concluded that the α-rhythm of man corresponded to the main rhythm of cats and dogs of 10-16 Hz, but not to the slower main rhythm of guinea pigs and rabbits.
4. A simple method of analysis of eeg was proposed. The result of analysis indicated that the higher the animals the more distinctly the frequencies of waves were differentiated.
