RT Journal A1 RODIN EE, LUBY EE T1 EFfects of lsd-25 on the eeg and photic evoked responses JF Archives of General Psychiatry JO Archives of General Psychiatry YR 1966 FD April 1 VO 14 IS 4 SP 435 OP 441 DO 10.1001/archpsyc.1966.01730100099013 UL http://dx.doi.org/10.1001/archpsyc.1966.01730100099013 AB SINCE the accidental discovery of the Psychosomimetic properties of Lysergic acid diethylamide (LSD-25) by Stoll,1 in 1947, a great amount of work has been carried out to elucidate the behavioral effects and pathophysiological mechanisms of action of this substance. The literature on this topic is steadily growing and contains now more than 1,000 publications.2There are several studies available that report on the electroencephalographic changes resulting from LSD administration to humans as seen by surface recordings3-9 and there are also some observations on changes in the human depth electrogram.10-13 It is generally agreed that the amplitude of the EEG decreases, α-rhythms tend to disappear and the tracings become of the lowvoltage fast or desynchronized type. Gastaut4 reported that the average α-frequencies are increased by 0.5 to 4 cycles per second (cps) and Grey Walter7 noted an increase from 11.6 to