Abstract
Measurement reliability is an important aspect of establishing the utility of scores used in clinical practice. Although much is known about the reliability of quantitative electroencephalographic (qEEG) metrics related to absolute power, less is known about the reliability of coherence metrics. The current study examined the measurement reliability of coherence metrics across standard frequency bands during an eyes-closed resting state. Reliability was examined both within channel pairs, and averaged across spatially contiguous channels, to summarize global patterns. We found that while most channel pairs were highly reliable on average, there was substantial variability across channels. Finally, we estimated the effect of measurement reliability on the detection of treatment-related neural change. We concluded that estimates of reliability for treated channels are crucial, and should factor into clinical assessment of treatment efficacy for EEG biofeedback (neurofeedback), especially in cases where large cross-channel variability is present.
Highlights
Technological advances in basic measures of electroencephalographic (EEG) recordings have led to a significantly expanded range of quantitative metrics of brain functioning
Most reliability studies of quantitative EEG (qEEG) have been limited to metrics related to absolute power
This study aimed to extend previous literature in the following ways: (1) by examining the test-retest reliability of qEEG coherence in a sample of healthy young adults across different frequency bands and regions of the brain, and (2) by translating this information into a more user-friendly format for clinical practice through the use of reliability of change metrics described below
Summary
Technological advances in basic measures of electroencephalographic (EEG) recordings have led to a significantly expanded range of quantitative metrics of brain functioning. Quantitative EEG (qEEG) has been useful in the assessment of neurological conditions, such as traumatic brain injury (TBI; Ronne-Engstrom & Winkler, 2006; Bozorg, Lacayo, & Benbadis, 2010). Most reliability studies of qEEG have been limited to metrics related to absolute power
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