<prompt> Sleep waves in hippocampal area isMP 2000, AI 1998, KARNATAKA 2002, ASSAM 2002DeltaThetaBetaAlpha  <response>: Ans. b ThetaRef: Ganong, 25th edp.273Theta waveFrequency is 4-7HzGenerated in hippocampusMost commonly seen in childrenPathologically seen often in degenerative brain diseases 