title: [Instantaneous energy spectrum analysis for frequency following response of speech evoked brainstem response].
abstract: Speech evoked brainstem responses (s-ABRs) elicited by a speech syllable /da/ are composed of four parts: onset response (OR), transitional response, frequency following response (FFR) and offset response. FFR elicited by periodic events behaves like a quasi-periodic waveform corresponding to the stimulus sounds. The fast Fourier transform based spectra are commonly used to exam the characteristics of s-ABR in practice, which is, however, unable to trace the occurrence of the main components of s-ABR. The FFR is usually not obvious in the original individual s-ABR waveform. In this paper, we proposed a novel approach to observe the FFR by an instantaneous energy spectrum performed on the intrinsic mode functions (IMFs) after empirical mode decomposition (EMD) of the s-ABR. We demonstrated that the FFR is most pronounced on the second layer of IMFs. This finding suggests a new way which may be available to characterize and to detect the FFR better. This will benefit the clinic applications of s-ABRs.
authors.affiliation: School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Peng
authors.forename: Qiuyang
authors.initials: Q
authors.lastname: Fu
authors.forename: Chang'an
authors.initials: C
authors.lastname: Zhan
authors.forename: Yong
authors.initials: Y
authors.lastname: Liang
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
mesh_terms: D000328:Adult; D001933:Brain Stem / Q000502:physiology*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D013060:Speech; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult