ABRET R.EEG.T Study Guide - EEG
Pattern Basics
EEG patterns are defined and describes by what 3 factors? - answer Frequency
Amplitude
Location
What are the 4 frequencies of normal EEG patterns? - answer Beta - Greater that 13 Hz
Alpha - 8 - 13 Hz
Theta - 3 - 7 Hz
Delta - 3 Hz or less
Beta waves (>13 Hz) - answer Normal waking state of consciousness when attention is
directed at cognitive tasks and the outside world. Beta is 'fast wave' activity and
dominated when we are alert, attentive and engages in problem-solving, decision
making and focused mental activity.
Alpha waves (8-13 Hz) - answer Normal variant of awake and alert eyes closed, relaxed
sinusoidal, waxing and waning, maximal in occipital, parietal, temporal. 8-13hz, Benaud
Phenomenon is alpha attenuates with eye opening but only on 1 side. right-handed
people are dominant on left side because of decussation, nondominant hemisphere is
taller by 50%
Theta waves (4-7 Hz) - answerTheta brainwaves are commonly found when we are
engaging in complex, inwardly-focused problem solving - like doing math problems in
our head. A presence of excessive Theta waves during a normal awake state could
reflect problems with focus and attention, head injuries, and learning disorders
Delta Waves (<3 Hz) - answerHigh amplitude neural oscillations with a frequency
between 0.5 and 4 hertz. Delta waves, like other brain waves, can be recorded with
electroencephalography and are usually associated with the deep stage 3 of NREM
sleep, also known as slow-wave sleep, and aid in characterizing the depth of sleep
Pattern Basics
EEG patterns are defined and describes by what 3 factors? - answer Frequency
Amplitude
Location
What are the 4 frequencies of normal EEG patterns? - answer Beta - Greater that 13 Hz
Alpha - 8 - 13 Hz
Theta - 3 - 7 Hz
Delta - 3 Hz or less
Beta waves (>13 Hz) - answer Normal waking state of consciousness when attention is
directed at cognitive tasks and the outside world. Beta is 'fast wave' activity and
dominated when we are alert, attentive and engages in problem-solving, decision
making and focused mental activity.
Alpha waves (8-13 Hz) - answer Normal variant of awake and alert eyes closed, relaxed
sinusoidal, waxing and waning, maximal in occipital, parietal, temporal. 8-13hz, Benaud
Phenomenon is alpha attenuates with eye opening but only on 1 side. right-handed
people are dominant on left side because of decussation, nondominant hemisphere is
taller by 50%
Theta waves (4-7 Hz) - answerTheta brainwaves are commonly found when we are
engaging in complex, inwardly-focused problem solving - like doing math problems in
our head. A presence of excessive Theta waves during a normal awake state could
reflect problems with focus and attention, head injuries, and learning disorders
Delta Waves (<3 Hz) - answerHigh amplitude neural oscillations with a frequency
between 0.5 and 4 hertz. Delta waves, like other brain waves, can be recorded with
electroencephalography and are usually associated with the deep stage 3 of NREM
sleep, also known as slow-wave sleep, and aid in characterizing the depth of sleep
