The rhythmical electrical potential waves recorded from the human brain have been classified by their discoverer, Berger2 into two types: alpha-waves, and beta-waves. This classification is made on the basis of the duration and amplitude of the waves. Waves having a duration of about .10 sec. and an amplitude of about 20 microvolts fall into the category of alpha-waves. Waves having a duration of about .04 sec. and an amplitude of about 10 microvolts make up the beta-waves. In general, the beta-wave is formed on the sides of the larger and more predominant alpha-wave.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Knott, John R.
"An Analysis of the Berger Rhythm, with Special Reference to the Duration and Amplitude of the Individual Wave,"
Proceedings of the Iowa Academy of Science, 43(1), 337-337.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/128