If a person is distracted, experiencing comprehension difficulties or daydreaming, the EEG activity would likely reflect a high theta to beta wave
ratio (also called Theta power/Beta power or busy brain ratio).
In addition, absolute mid beta waves
increased in the same regions (left frontal and right parietal) and these changes might be enhancing the alertness state.
Stroop Beta Waves
: Initial beta waves
recorded during Stroop testing ranged from 11.70 to 80.58 mV with an average of 27.84 +/- 2.92 mV.
For instance, the presence of beta waves
correlates with excitement, focus and stress.
But it is fine when trying to detect the activity, called beta waves
, that indicates attention.
(13-18 Hz) are needed to solve a problem or complete a task.
The current increased the activity of normal beta waves
-- a kind of brain wave that is usually active during sustained muscle activities, such as holding a book.
The EEG studies showed an increase in beta waves
and a decrease in spike wave discharges.
These include gamma, theta, alpha and beta waves
. Gamma waves are present during sound sleep; theta waves indicate dozing or sleeping; beta waves
are present during an awake, excited state and alpha waves signify an awake, relaxed state.
By placing the electrodes of an electroencephalogram on the skull right above the cerebral cortex, one can record brain waves that reveal a range of levels of consciousness, from alertness (beta waves
) to NREM sleep (delta waves).