MEG study identifies multiple dimensions of cortical excitability
Published in Brain Activity, Brain/Neurology, Journals, Scanners and Imaging, Tools.
Published October 30, 2026.
A Communications Biology study compares several indirect measures of cortical excitability using whole-head magnetoencephalography in healthy adults. Recordings were collected at rest and during auditory stimulation at 40 hertz.
Rather than finding one interchangeable measure of excitability, the analysis identified six dimensions with limited overlap. The metrics included stimulus synchronization, spectral power, aperiodic activity, signal complexity, temporal correlations and phase–gamma synchronization.
Some measures, particularly aperiodic and alpha-band features, were closely related, while complexity, temporal and synchronization measures captured more independent information. The dimensions also differed in their relationships to brain structure and neurotransmitter-receptor distributions.
The results support combining complementary measurements when studying how readily cortical networks respond. They do not establish a single diagnostic score, directly measure every neuron’s excitability or validate a test for neurological disease. Because the reported analysis involved healthy adults, clinical applications require additional study.