title: Effect of echolocation behavior-related constant frequency-frequency modulation sound on the frequency tuning of inferior collicular neurons in Hipposideros armiger.
abstract: In constant frequency-frequency modulation (CF-FM) bats, the CF-FM echolocation signals include both CF and FM components, yet the role of such complex acoustic signals in frequency resolution by bats remains unknown. Using CF and CF-FM echolocation signals as acoustic stimuli, the responses of inferior collicular (IC) neurons of Hipposideros armiger were obtained by extracellular recordings. We tested the effect of preceding CF or CF-FM sounds on the shape of the frequency tuning curves (FTCs) of IC neurons. Results showed that both CF-FM and CF sounds reduced the number of FTCs with tailed lower-frequency-side of IC neurons. However, more IC neurons experienced such conversion after adding CF-FM sound compared with CF sound. We also found that the Q 20 value of the FTC of IC neurons experienced the largest increase with the addition of CF-FM sound. Moreover, only CF-FM sound could cause an increase in the slope of the neurons' FTCs, and such increase occurred mainly in the lower-frequency edge. These results suggested that CF-FM sound could increase the accuracy of frequency analysis of echo and cut-off low-frequency elements from the habitat of bats more than CF sound.
authors.affiliation: School of Life Sciences and Hubei Key Lab of Genetic Regulation & Integrative Biology, Central China Normal University, Wuhan, 430079, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Tang
authors.forename: Zi-Ying
authors.initials: ZY
authors.lastname: Fu
authors.forename: Chen-Xue
authors.initials: CX
authors.lastname: Wei
authors.forename: Qi-Cai
authors.initials: QC
authors.lastname: Chen
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D002685:Chiroptera / Q000502:physiology*; D004455:Echolocation / Q000502:physiology*; D005260:Female; D007245:Inferior Colliculi / Q000502:physiology*; D008297:Male; D009474:Neurons / Q000502:physiology*