High frequency sensitivity to interaural onset time differences in the bat inferior colliculus

Haqqee, Zeeshan; Valdizón-Rodríguez, Roberto; Faure, Paul

doi:10.1016/j.heares.2020.108133

Cited by 7 publications

(9 citation statements)

References 75 publications

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“…However, the monotonic type (24/40, 60%) was most commonly observed for basal units with ITD sensitivity. The distributions of the ITD tuning type reported in this study are consistent with those of previous studies of single‐unit responses in the IC (Haqqee et al., 2021; McAlpine et al., 2001). The majority of low‐CF units (<1.5 kHz) showed peaks at the contralaterally leading ITDs of noise bursts (50 Hz–5 kHz) and were classified as peak type in the IC of the guinea pig (McAlpine et al., 2001).…”

Section: Discussionsupporting

confidence: 91%

“…The majority of low‐CF units (<1.5 kHz) showed peaks at the contralaterally leading ITDs of noise bursts (50 Hz–5 kHz) and were classified as peak type in the IC of the guinea pig (McAlpine et al., 2001). In addition, similar proportions of high‐CF units in the IC of the bat largely displayed monotonic ITD sensitivity to high‐frequency tones (20–50 kHz), with a minority showing trough and peak types (Haqqee et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

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Effects of place of stimulation on the interaural time difference sensitivity in bilateral electrical intracochlear stimulations: Neurophysiological study in a rat model

Sunwoo

2021

J of Neuroscience Research

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We examined the sensitivity of the neurons in the inferior colliculus (IC) in male and female rats to the interaural time differences (ITDs) conveyed in electrical pulse trains. Using bipolar pairs of electrodes that selectively activate the auditory nerve fibers at different intracochlear locations, we assessed whether the responses to electrical stimulation with ITDs in different frequency regions were processed differently. Most well‐isolated single units responded to the electrical stimulation in only one of the apical or basal cochlear regions, and they were classified as either apical or basal units. Regardless of the cochlear stimulating location, more than 70% of both apical and basal units were sensitive to ITDs of electrical stimulation. However, the pulse rate dependence of neural ITD sensitivity differed significantly depending on the location of the stimulation. Moreover, ITD discrimination thresholds and the relative incidence of ITD tuning type markedly differed between units activated by apical and basal stimulations. With apical stimulation, IC neurons had a higher incidence of peak‐type ITD function, which mostly exhibited the steepest position of the tuning curve within the rat's physiological ITD range of ±160 μs and, accordingly, had better ITD discrimination thresholds than those with basal stimulation. These results support the idea that ITD processing in the IC might be determined by functionally segregated frequency‐specific pathways from the cochlea to the auditory midbrain.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Effects of place of stimulation on the interaural time difference sensitivity in bilateral electrical intracochlear stimulations: Neurophysiological study in a rat model

Sunwoo

2021

J of Neuroscience Research

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“…It is also possible to use the frequency information contained in the echoes to exclude clutter [ 28 ]. For information about the horizontal angle of the object, binaural cues for sound localization provide the information [ 26 , 29 – 31 ]. In the present study, we calculated the echo incidence points by an engineering method [ 32 ] from interaural time difference in the acoustical simulation because by considering the spatial resolution of bats in the horizontal direction [ 29 ], the object localization is comparable to that of this method.…”

Section: Discussionmentioning

confidence: 99%

Analysis of echolocation behavior of bats in “echo space” using acoustic simulation

et al. 2022

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Background Echolocating bats use echo information to perceive space, control their behavior, and adjust flight navigation strategies in various environments. However, the echolocation behavior of bats, including echo information, has not been thoroughly investigated as it is technically difficult to measure all the echoes that reach the bats during flight, even with the conventional telemetry microphones currently in use. Therefore, we attempted to reproduce the echoes received at the location of bats during flight by combining acoustic simulation and behavioral experiments with acoustic measurements. By using acoustic simulation, echoes can be reproduced as temporal waveforms (including diffracted waves and multiple reflections), and detailed echo analysis is possible even in complex obstacle environments. Results We visualized the spatiotemporal changes in the echo incidence points detected by bats during flight, which enabled us to investigate the “echo space” revealed through echolocation for the first time. We then hypothesized that by observing the differences in the “echo space” before and after spatial learning, the bats’ attentional position would change. To test this hypothesis, we examined how the distribution of visualized echoes concentrated at the obstacle edges after the bats became more familiar with their environment. The echo incidence points appeared near the edge even when the pulse direction was not toward the edge. Furthermore, it was found that the echo direction correlated with the turn rate of the bat’s flight path, revealing for the first time the relationship between the echo direction and the bat’s flight path. Conclusions We were able to clarify for the first time how echoes space affects echolocation behavior in bats by combining acoustic simulations and behavioral experiments.

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“…Only a very few percentage of cyclic responses are reported. A recent study shows that a majority of ITD responses to high frequency onset time differences are monotonic [ 39 ]. The monotonic responses show a linear variation of the response in the biologically relevant ITD range.…”

Section: Discussionmentioning

confidence: 99%

“…The monotonic responses show a linear variation of the response in the biologically relevant ITD range. In addition, ITD responses show time intensity trading [ 39 , 40 ].…”

Section: Discussionmentioning

confidence: 99%

Active head rolls enhance sonar-based auditory localization performance

Wijesinghe

Wohlgemuth

et al. 2021

PLoS Comput Biol

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Animals utilize a variety of active sensing mechanisms to perceive the world around them. Echolocating bats are an excellent model for the study of active auditory localization. The big brown bat (Eptesicus fuscus), for instance, employs active head roll movements during sonar prey tracking. The function of head rolls in sound source localization is not well understood. Here, we propose an echolocation model with multi-axis head rotation to investigate the effect of active head roll movements on sound localization performance. The model autonomously learns to align the bat’s head direction towards the target. We show that a model with active head roll movements better localizes targets than a model without head rolls. Furthermore, we demonstrate that active head rolls also reduce the time required for localization in elevation. Finally, our model offers key insights to sound localization cues used by echolocating bats employing active head movements during echolocation.

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High frequency sensitivity to interaural onset time differences in the bat inferior colliculus

Cited by 7 publications

References 75 publications

Effects of place of stimulation on the interaural time difference sensitivity in bilateral electrical intracochlear stimulations: Neurophysiological study in a rat model

Effects of place of stimulation on the interaural time difference sensitivity in bilateral electrical intracochlear stimulations: Neurophysiological study in a rat model

Analysis of echolocation behavior of bats in “echo space” using acoustic simulation

Active head rolls enhance sonar-based auditory localization performance

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