There is a growing body of research suggesting that EEG-related technologies can provide a complementary view of brain function alongside standard screenings and assessments to provide another layer of objective data to make the most accurate conclusions with mental health diagnosis.
ADHD AND THETA/BETA AT CZ
EEG scans using Theta/Beta ratios at Cz associate with cortical arousal and high Theta/Beta ratios correlate with ADHD. Research shows a 94% true positive accuracy for ADHD. Attention-deficit/hyperactivity disorder (ADHD) was found to be characterized by a deviant pattern of electrocortical activity during resting state, particularly increased theta and decreased beta activity.
ANXIETY / DEPRESSION AND F3/F4 ALPHA POWER
EEG studies have shown a link between hemispheric asymmetry in frontal regions of the cortex and both anxiety and depression symptoms. This correlation suggests that anxiety and depression are meaningfully related to relative frontal EEG asymmetry at rest (F3/F4 <1). Research shows an atypical pattern of resting frontal cortical asymmetry can serve as a risk factor for the development of anxiety and depression or other emotion-related disturbances where hemispheric specialization for cortical systems mediates motivational and emotional processes.
PTSD AND AUDIO P300
The Audio P300 research has shown that an increase in latency and/or a decrease in amplitude has been observed in various conditions associated with brain trauma. Research shows injured participants often pass clinical tests while still displaying electrophysiological deficits.
EEG scans can show significant changes in P300 amplitude following a traumatic incident. P300 measurements normalize through progressive treatment and management of injured patients. Findings conclude that EEGs and P300 amplitude can establish normalized data to be used as a marker in determining brain trauma.
PTSD AND F3/F4 ALPHA POWER
Differences in Alpha power between the left and ride sides of the brain can give information about emotional states. Large differences in Alpha power between the left-front and right-front of the brain have been associated with anxiety and depression, often correlated with PTSD. Studies have linked PTSD with decreases in low-frequency waves, notably in the right temporoparietal region. The differences in the levels of the waves may explain some of the symptoms of anxiety for someone with PTSD.