ACNS 2012 Terminology

background EEG > symmetry


1. Symmetric;

2. Mild asymmetry (consistent asymmetry in amplitude on referential recording of <50%, or consistent asymmetry in frequency of 0.5 - 1 Hz);

3. Marked asymmetry (>50% amplitude or >1 Hz frequency asymmetry). Breach effect (note presence, absence, or unclear) When any of the following features are asymmetric, they should be described separately for each hemisphere.