專題演講 Seminar

2018/11/30(Fri)     11:00 -12:00    P101會議室 1F, P101 Meeting Room

Title

Coupling between active oscillators in the two ears: an evidence from synchronized otoacoustic emissions

Speaker

Dr. Yuttana Roongthumskul (Department of Physics, Chulalongkorn University Bangkok)

Abstract

Spontaneous otoacoustic emissions (SOAEs) are low-level sounds emanating from the ears in the absence of acoustic stimulation. These emissions are a manifestation of the active process of the inner ear that enhances the auditory system’s sensitivity to weak sounds. We recorded SOAEs simultaneously from the two ears of tokay geckos and found that binaural emissions could be strongly correlated. Some emission peaks were observed at the same frequency in both ears with high degree of phase-locking. Manipulations of the emissions by controlling the pressure level and the body temperature indicated that the ears were highly synchronized within some ranges of frequency. These observations agreed with a mathematical model of two nonlinear oscillators, mutually coupled by the air within a lizard’s head cavity. These results show that some SOAEs are bilaterally generated and signify the synchronization of the active processes of the two inner ears.

Language

演講語言 (Language): in English