“…Although earlier reports by Given, Little and Tovell (1957) and by Robson and Sheridan (1957) seemed to suggest a correlation between the pattern of e.e.g. tracings and the level of narcosis during halothane anaesthesia, subsequent investigators were unable to corroborate these findings (Gain and Paletz, 1957;Bumap, Galla and Vandam, 1958).…”