… beta (15-30 hertz) and gamma (greater than 30 hertz) oscillations, which are believed to help organize information … drugs such as propofol have a significant effect on these oscillations. During anesthesia induced by propofol or other … (0.1-1 hertz), delta (1-4 hertz) and alpha (8-14 hertz) oscillations. With higher doses of these anesthetic drugs, …