Title :
The perception of postural instability as revealed by Morlet wavelet transform in EEG
Author :
Slobounov, S. ; Tutwiler, R.L. ; Slobounova, E. ; Fedon, S.
Author_Institution :
Dept. of Kinesiology, Pennsylvania State Univ., University Park, PA, USA
Abstract :
Our principal finding from this study is that there are changes at the level of brain electrical activity (EEG), in the time-frequency domain, during states of perceptual detection of postural instability of the virtual person. The Morlet wavelet transform was applied to examine the phase-locking transition within the 10-40 Hz frequency range as a function of change in the focused attention during perceptual tasks aimed to detect non-stable postural dynamics. It was found that the high energy 40 Hz time-frequency cluster at the fronto-central area was preceded by 20 Hz signal activity and followed by a 30 Hz signal cluster when subjects detect non-stable postures. This fortifies the use of time-frequency analysis as an invaluable tool for the detection, estimation and tracking of event-related EEG frequency distributions
Keywords :
electroencephalography; medical signal processing; patient monitoring; time-frequency analysis; visual perception; wavelet transforms; 20 to 40 Hz; Morlet wavelet transform; brain electrical activity; estimation; event-related EEG frequency distributions; focused attention; fronto-central area; nonstable postural dynamics; perception; perceptual detection; phase-locking transition; postural instability; time-frequency analysis; time-frequency cluster; time-frequency domain; tracking; virtual person; Animation; Brain; Electroencephalography; Frequency domain analysis; Frequency estimation; Laboratories; Phase detection; Signal analysis; Time frequency analysis; Wavelet transforms;
Conference_Titel :
Time-Frequency and Time-Scale Analysis, 1998. Proceedings of the IEEE-SP International Symposium on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-5073-1
DOI :
10.1109/TFSA.1998.721366
