EEG WAVES

1) INFRA SLOW FREQUENCY OSCILLATIONS (< 0.5Hz frequency)

2) DELTA WAVES (0.5 - 4 Hz frequency) (20 - 100 microvolts amplitude) 

• OCCIPITO-TEMPORAL REGION

•  D FOR D ; DEEP SLEEP - PHYSIOLOGICAL

•  PATHOLOGICAL - GENERALIZED ENCEPHALOPATHY ; FOCAL CEREBRAL DYSFUNCTION 

3) THETA WAVES (4 - 7 Hz frequency) (< 90  microvolts amplitude)

•  PARIETAL AND TEMPORAL REGIONS IN CHILDREN

•  DROWSINESS , EARLY STAGES OF SLEEP N1 , N2 ; CHILDREN IN MODERATE SLEEP ; ADULTS WHO ARE MEDITATING

4) ALPHA WAVES (8 - 12 Hz frequency) (50 - 100  microvolts amplitude) 

• PARIETO-OCCIPITAL REGION

•  AWAKE AND RESTING WITH CLOSED EYES

•  ALPHA COMA - DIFFUSE ENCEPHALOPATHY PATIENTS WITH GENERALIZED ALPHA ACTIVITY WHICH IS NOT REACTIVE TO INTERNAL / EXTERNAL STIMULI

5) BETA WAVES (13 - 30 Hz frequency) (10 - 20  microvolts amplitude) 

• FRONTAL AND PARIETAL REGION

•  AWAKE WITH OPEN EYES AND ACTIVITY , ALERT

6) SIGMA WAVES (SLEEP SPINDLES) (12 - 16 Hz frequency) 

•  FRONTOCENTRAL HEAD REGIONS

• PHYSIOLOGICALLY N2 SLEEP

•  PATHOLOGICALLY GENERALIZED ENCEPHALOPATHY [SPINDLE COMA] 

7) HIGH FREQUENCY OSCILLATIONS (30 - 500 Hz frequency)

#crackmbbs