Intro. To Biomedical Engineering Presentation #1- EEG -( ELECTROENCEPHALOGRAM )By Dzahiruddin B. Dzulkifee Mar! N". #BBET $%&$%'$(An Ele!r"en!e)hal"*ra+ is a test to measure and record electrical activity of the brain using an Ele!r"en!e)hal"*ra)h.The brain roduces electrical imulses !hich can be ic"ed u by secial electrodes and amli#ed !hich is then translated into !aves either on a grah aer or saved on a comuter.EEG activity is very small$ ususally measured in microvolts %&'( !ith fre)uencies of u to *+ ,-.Physicians can then analyse the data to diagnose the atient.,nr"du!i"n.ometimes the symtoms and e/amination of a atient does not turn out !ith helful information ertaining to their condition0illness. These are some of the reasons an EEG may be used for12lassifying tyes of sei-ures3bserving slee disordersIdentifying damaged areas of the brain as a result of trauma.and to determine if a atient is brain dead.4hy it is done.EEG consists of5ElectrodesAmli#er6ilter7ecording unit2omonents6re)uency bands in EEG-i*nal ran*e5 ./0 (1rain deah) 2 3e4eral hundred /0.6re)uency bands5Dela (5( Hz) 5 normally found only !hen in dee aslee.Thea ((67 Hz) 5 normally found in sleeing adults and young childrenAl)ha (86$9 Hz) 5 mostly belo! 8+&'$ normally found in adult during rela/ed and mentally inactive a!a"e ness$ Bea ($(69& Hz) 5 mostly belo! *+&'$ normally found !hen you are alert$ enhanced by e/ectancy states and tensionGa++a (:9& Hz) 5 9sually it is not of clinical and hysiological interests and often #ltered out in EEG recordings.6re)uency bands in EEGBE;ORE TE-T5Avoid ta"ing certain medicines %sedative$ rela/ants$ medicine to treat sei-ures($ refer to :octor$ as they can a;ect normal brain activity and s"e! the results.