TABLE 1.

Selected historical studies to date focusing on qualitative EEG findings and SWS.

Author (year)	Number of patients with EEGs	Findings	Evolution of EEG over time?
Cohen (1941)	1	Asymmetry	ND
Radermecker (1951)	1	Asymmetry	ND
Lichtenstein (1954)	1	Asymmetry	ND
Livingston (1956)	3	Diffusely slow (1), asymmetry (2)	ND
Peterman (1958)	26	Asymmetry and sharp waves	ND
Chao (1959)	9	Asymmetry and spike waves	Yes
Andriola (1972)	1	Asymmetry and spike waves	Yes
Brenner (1976)	16	Asymmetry and spike waves	No
Fukuyama (1979)	5	Asymmetry and spike waves	Yes

^*ND=Not described.