Assessment of the high-frequency components of brain electrical activity using inhomogeneity indexes

Inhomogeneity indexes were developed, and were found to be quite reliable indicators of the presence of short-term high-frequency bursts in the electrical activity of the dog brain, and were also sensitive discriminators of quasi-homogeneous fragments in terms of the level of "general activation." Studies demonstrated that the values of these coefficients reflect the individual features of animal brain electrical activity, as well as its dynamics during the development of conditioned operant feeding reflexes. At the same time, these indexes did not reveal any regional variations. Using the construction of an inhomogeneity spectrum as an example, an approach to identifying similar numerical characteristics, also based on traditional harmonic analysis (Fourier transformation), is discussed. ©1998 Plenum Publishing Corporation.