Time-frequency representation of electrocorticograms in temporal lobe epilepsy
Three time-frequency distributions are evaluated in terms of their efficacy in representing nonstationary electrocorticograms (ECoG's) in human temporal lobe epilepsy. The results of a new method, the exponential distribution, are compared with those of the spectrogram and the Wigner distribution. It is shown that the exponential distribution represents a considerable improvement over the spectrogram in terms of resolution and markedly reduces cross-terms present in the Wigner distribution. Exponential distribution representations of ECoG's from different stages of an epileptic record are developed as contour maps. These high-resolution representations offer a lucid display of temporal-spectral features of the rapidly varying signals that constitute ECoG's recorded in temporal lobe epilepsy.
Medical Subject Headings
Adult; Cerebral Cortex (physiopathology); Electroencephalography (methods); Epilepsy, Temporal Lobe (diagnosis, physiopathology); Humans; Mathematics; Time Factors
IEEE transactions on bio-medical engineering
Digital Object Identifier (DOI)
Zaveri, H P.; Williams, W J.; Iasemidis, L D.; and Sackellares, J C., "Time-frequency representation of electrocorticograms in temporal lobe epilepsy" (1992). Translational Neuroscience. 1173.