What else can spectral analysis measure?
A special result of spectral analysis is a measure of the coherence between two electrodes. This is referred to as “spectral coherence”. It assesses the similarity of spectral content of two electrodes over time and is usually taken to reflect a measure of “coupling” between brain regions. It is virtually impossible to estimate coherence by visual EEG inspection. Some illnesses may begin with abnormalities of cortical “coupling”. Leuchter has reported such abnormalities in Alzheimer’s Disease and Thatcher found abnormality of coherence as the best discriminator of mild closed head injury.
