Improving medical students

Diagnosing ADHD with EEG

Posted by medliorator on December 5, 2008

he use of QEEG [Quantitative EEG] is based on findings that individuals with ADHD have a distinctive pattern of brain electrical activity that is often referred to as “cortical slowing”; this is characterized by an elevation of low frequency theta waves and a reduction of higher frequency beta waves in the prefrontal cortex. Theta wave activity is associated with an unfocused and inattentive state while beta activity is associated with more focused attention. Thus, an elevated theta/beta ratio reflects a less alert and more unfocused state.

In past studies, roughly 90% of individuals diagnosed with ADHD based on a comprehensive evaluation tested positive for this EEG marker. In contrast, about 95% of normal controls tested negative. Thus, while not a perfectly reliable indicator, the sensitivity and specificity of QEEG in identifying ADHD was extremely strong.

Neurofeedback/ Quantitative EEG for ADHD diagnosis [SharpBrains]

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