Processing of Natural Echolocation Sequences in the Inferior Colliculus of Seba’s Fruit Eating Bat,<i>Carollia perspicillata</i>

Beetz, M. Jerome; Kordes, Sebastian; García‐Rosales, Francisco; Kössl, Manfred; Hechavarría, Julio C.

doi:10.1523/eneuro.0314-17.2017

Cited by 29 publications

(38 citation statements)

References 148 publications

(185 reference statements)

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“…The results show that cortical neurons responded primarily to echoes from the closest object. The suppression of responses to echoes at longer delays observed in cortical neurons was absent in the IC, and Beetz et al (2017) suggested that parallel processing of multiple echoes at the level of the midbrain IC might drive cortical representation of the closer objects.…”

Section: Discussionmentioning

confidence: 99%

“…Neurophysiological studies in several bat species have measured single unit responses to broadcasts of natural echolocation sequences, which contained echoes from one or more objects (Bartenstein et al, 2014;Beetz et al, 2016Beetz et al, , 2017Greiter and Firzlaff, 2017;Macias et al, 2018;Sanderson and Simmons, 2000). For example, researchers presented the anesthetized FM bat Phyllostomus discolor with acoustic pulse-echo stimuli that simulated the bat's decreasing distance to one (Bartenstein et al, 2014) or two (Greiter and Firzlaff, 2017) objects, and characterized single-unit responses in the auditory cortex.…”

Section: Discussionmentioning

confidence: 99%

“…Single-unit responses to echolocation sequences containing up to three echoes have been characterized in the IC and auditory cortex of the anesthetized fruit bat Carollia perspicillata (Beetz et al, 2016(Beetz et al, , 2017. In these studies, acoustic stimuli contained call-echo segments of natural echolocation sequences that were recorded from a bat swinging on a pendulum, which passed by three objects.…”

Section: Discussionmentioning

confidence: 99%

“…Recent research has investigated single neuron responses in bat midbrain and cortical areas to playbacks of sonar broadcasts coupled with one to three echoes, which were presented at varying overall delays to simulate objects at decreasing distances (e.g. Bartenstein et al, 2014;Beetz et al, 2017;Greiter and Firzlaff, 2017). However, neural responses to streams of multiple echoes at short delay separations within a cascade, such as those experienced by the bat in the present echo flow corridor, remain to be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Echo interval and not echo intensity drives bat flight behavior in structured corridors

Warnecke

Macías

Falk

et al. 2018

Journal of Experimental Biology

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To navigate in the natural environment, animals must adapt their locomotion in response to environmental stimuli. The echolocating bat relies on auditory processing of echo returns to represent its surroundings. Recent studies have shown that echo flow patterns influence bat navigation, but the acoustic basis for flight path selection remains unknown. To investigate this problem, we released bats in a flight corridor with walls constructed of adjacent individual wooden poles, which returned cascades of echoes to the flying bat. We manipulated the spacing and echo strength of the poles comprising each corridor side, and predicted that bats would adapt their flight paths to deviate toward the corridor side returning weaker echo cascades. Our results show that the bat's trajectory through the corridor was not affected by the intensity of echo cascades. Instead, bats deviated toward the corridor wall with more sparsely spaced, highly reflective poles, suggesting that pole spacing, rather than echo intensity, influenced bat flight path selection. This result motivated investigation of the neural processing of echo cascades. We measured local evoked auditory responses in the bat inferior colliculus to echo playback recordings from corridor walls constructed of sparsely and densely spaced poles. We predicted that evoked neural responses would be discretely modulated by temporally distinct echoes recorded from the sparsely spaced pole corridor wall, but not by echoes from the more densely spaced corridor wall. The data confirm this prediction and suggest that the bat's temporal resolution of echo cascades may drive its flight behavior in the corridor.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Echo interval and not echo intensity drives bat flight behavior in structured corridors

Warnecke

Macías

Falk

et al. 2018

Journal of Experimental Biology

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“…To ensure that bats were not able to move during the recordings, their heads were fixed by holding a metal rod attached to the scalp. The surgical procedure for metal rod fixation has been described elsewhere 41,92,95 . Briefly, in fully anesthetized bats (Ketamine (10 mg *kg − 1 Ketavet, Pfizer) and Xylazine (38 mg *kg − 1 Rompun, Bayer)), the skin and muscles covering the scalp were removed.…”

Section: Setup For Dpoae Measurementsmentioning

confidence: 99%

Superfast periodicities in distress vocalizations emitted by bats

Hechavarría

Beetz

García‐Rosales

et al. 2019

Preprint

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spectrum Abbreviations:AM: amplitude modulation, d: Cliff's delta, DPOAE; distortion product otoacoustic emissions, FFR: frequency following response, FOI, frequency of interest, FPV: fast periodic vocalizations, HND: harmonic-to-noise difference, HR: heart rate, iEEG: intracortical encephalogram, IQR; interquartile range, MPS: modulation power spectrum, qCF-FM: quasiconstant frequencyfrequency modulated, SFM: sinusoidal frequency modulation, SVM: support vector machine, TMS: temporal modulation spectrum. AbstractCommunication sounds are ubiquitous in the animal kingdom, where they play a role in advertising physiological states and/or socio-contextual scenarios. Distress sounds, for example, are typically uttered in distressful scenarios such as agonistic interactions. Here, we report on the occurrence of superfast temporal periodicities in distress calls emitted by bats (species Carollia perspicillata). Distress vocalizations uttered by this bat species are temporally modulated at frequencies close to 1.7 kHz, that is, ~17 times faster than modulation rates observed in human screams. Fast temporal periodicities are represented in the bats' brain by means of frequency following responses, and temporally periodic sounds are more effective in boosting the heart rate of awake bats than their demodulated versions. Altogether, our data suggest that bats, an animal group classically regarded as ultrasonic, can exploit the low frequency portion of the soundscape during distress calling to create spectro-temporally complex, arousing sounds.

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Adaptations in the call emission pattern of frugivorous bats when orienting under challenging conditions

2019

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Processing of Natural Echolocation Sequences in the Inferior Colliculus of Seba’s Fruit Eating Bat,Carollia perspicillata

Abstract: Visual Abstract

Cited by 29 publications

References 148 publications

Echo interval and not echo intensity drives bat flight behavior in structured corridors

Echo interval and not echo intensity drives bat flight behavior in structured corridors

Superfast periodicities in distress vocalizations emitted by bats

Adaptations in the call emission pattern of frugivorous bats when orienting under challenging conditions

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