<prompt> Which of the following can lower EEG amplitudeN20KetamineHypothermiaEarly hypoxia  <response>: C i.e. Hypothermia - EEG activation i.e. high frequency low voltage activity is seen in Mn-Small BBC In English Stimulates No Hypoxic Keets i.e. Barbiturates small dose, Benzodiazepines small dose, Mild hypercapnia TCO2, Inhalational agents subanesthetic, Etomidate small doses, sensory stimulation, N20, Hypoxia early, ketamine. Here small small, mild, early or subanesthetic dose. EEG depression is caused by Mn- Marked Hypo i.e. hypothermia, hypocapnia, Propofol and Opioids and all marked i.e. marked hypoxia late, marked hypercapnia, large dose of barbiturates, etomidate inhalational agents 1-2 MAC. 