Empirical mode decomposition-based approach for intertrial analysis of olfactory event-related potential features

Chi Hsun Wu, Po Lei Lee*, Chih Hung Shu, Chia Yen Yang, Men Tzung Lo, Chun Yen Chang, Jen Chuen Hsieh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This study presents an empirical mode decomposition (EMD)-based method to study the intertrial variability of olfactory event-related potential (OERP) features. The olfactory stimulus in this study was a mixture of 60 % humidity air and 40 % phenyl ethanol alcohol generated by a computercontrolled olfactometer with a constant flow rate of 8 L/min. A 32-channel whole-head EEG system was utilized to investigate the olfactory responses in 12 healthy subjects. Each EEG epoch was segmented based on the olfactory stimulus onset and subsequently decomposed into a set of intrinsic mode functions (IMFs) by using EMD. Only IMFs that met both frequency and spatial dual criteria were chosen as OERPrelated IMFs for reconstructing the noise-suppressed singletrial activity, and those significant trials with N1/P2 amplitudes lower/greater than the mean minus/plus two times the standard deviations of baseline amplitudes were denoted as single-trial OERP for intertrial variability analysis. The present approach enables the capability to study intertrial OERP features, such as the latencies and amplitudes of N1 and P2 peaks, on trial-by-trial basis, which may be helpful to shed light on future olfactory dysfunction studies.

Original languageEnglish
Pages (from-to)280-291
Number of pages12
JournalChemosensory Perception
Issue number3-4
Publication statusPublished - 2012 Dec


  • Electroencephalography
  • Empirical mode decomposition
  • Olfactory event-related potential

ASJC Scopus subject areas

  • Sensory Systems
  • Cellular and Molecular Neuroscience


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