Lambda Waves of Human Subjects of Different Age Levels
Lambda waves are a relatively recently discovered type of electrical activity of the human brain which so far has been little investigated systematically. Evans  in 1949 was the first to report so-called “sharp waves” in the occipital region, which in 1952  he termed lambda waves. Lambda waves are recognized as being a type of electrical activity that is closely related to ordinary physiological and psychological phenomena. Under conditions of good illumination, during spontaneous visual scanning, lambda waves are clearly evident, but during steady fixation at a point, the waves are absent. They are also absent when the eyes are closed or under conditions of darkness [4, 5], Cobb and Pampiglione , Roth and Green , Green , and Groethuysen and Bickford  have all observed these phenomena. In addition Gastaut and Bert  observed that the brain readily manifested lambda waves when a movie was being watched. Roth, Shaw, and Green  observed that lambda waves were readily apparent when K-complexes, which appear from the brain during sleep, were present.
KeywordsVisual Perception White Paper Visual Imagery Mental Arithmetic Occipital Region
Unable to display preview. Download preview PDF.
- 1.Wu Qin-e, Wu Zhen-yun, and Liu Shih-yih, [The EEG during sleep inhuman subjects of different age levels] (in Chinese) (1965) (unpublished).Google Scholar
- 2.Cobb, W. A., and Pampiglione, G., Occipital sharp waves responsive to visual stimuli, Electroenceph. clin. Neurophysiol., 4:110–111 (1952).Google Scholar
- 3.Evans, C. C., Comments on occipital sharp waves responsive to visual stimuli, Electroenceph. clin. Neurophysiol., 4:111 (1952).Google Scholar
- 8.Groethuysen, U. C., and Bickford, R. G., Study of the lambda wave response of human beings, Electroenceph. clin. Neurophysiol., 8:344 (1956).Google Scholar
- 11.Rémond, A., and Lesèvre, N., The conditions of appearance and the statistical importance of the lambda waves in normal subjects, Electroenceph. clin. Neurophysiol., 8:172 (1956).Google Scholar