Title :
Time-frequency distribution mappings of somatosensory evoked potentials
Author :
Babiloni, F. ; Salinari, S. ; Urbano, A.
Author_Institution :
Univ. of Rome La Sapienza, Italy
Abstract :
Long-latency somatosensory evoked potentials (SEPs) recorded from the human scalp, up to 500 ms after median nerve stimulation, often exhibit a nonstationary nature. The time-frequency amplitude for every SEP was computed by a short-time Fourier transform; short-time periodograms and Wigner transforms were used to calculate SEP energy distribution. In order to study the evolution of signal amplitude or energy at some frequency band of interest, colour mappings of these components over the entire scalp were computed. This approach seems to be very useful for a comprehensive reconstruction of the SEP phenomena in the joint time-frequency domain.<>
Keywords :
bioelectric potentials; mechanoception; Wigner transforms; colour mappings; frequency band; human scalp; median nerve stimulation; short-time Fourier transform; short-time periodograms; signal evolution; somatosensory evoked potentials; time-frequency distribution mappings;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.94840
