Physiology Propeies of alpha waves are all of the following except: September 2009 A It is most marked in the parieto-occipital area B It has a frequency of 8-12 Hz C Frequency is decreased by low glucose level D Seen in REM sleep 💡 Explanation Propeies of alpha waves are all of the following except: September 2009 ✓ Correct Answer: D. Seen in REM sleep