Slow waves in EEG activity are seen in:
Depression
Delirium
Schizophrenia
Mania
Delirium: Generalized slowing waves on the EEG are seen. Except in delirium caused by benzodiazepine withdrawal and delirium tremens. For Depression, Schizophrenia and Mania there is no characteristic finding on the EEG.
Neurotic, Stress Related and Somatoform Disorders