Time-frequency representation of electrocorticograms in temporal lobe epilepsy

IEEE Trans Biomed Eng. 1992 May;39(5):502-9. doi: 10.1109/10.135544.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Cerebral Cortex / physiopathology*
  • Electroencephalography / methods*
  • Epilepsy, Temporal Lobe / diagnosis*
  • Epilepsy, Temporal Lobe / physiopathology
  • Humans
  • Mathematics
  • Time Factors