Vocal recognition in mexican free-tailed bats: do pups recognize mothers?

Balcombe, Jonathan; McCracken, Gary F.

doi:10.1016/s0003-3472(05)80073-9

Cited by 105 publications

(66 citation statements)

References 17 publications

(28 reference statements)

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“…This was observed in Antrozous pallidus by Brown (1976) and in Phyllostomus discolor by Rother & Schmidt (1985). Social calls of the females that differ individually in their frequency structures in P. discolor and in T. brasiliensis mexicana are responsible for this feature (Esser & Schmidt, 1989;Balcombe & McCracken, 1992). In Rhinolophus ferrumequinum nippon, an individual variability and mutual recognition of calls is achieved by a synchronized development with a special time course of calls and their frequencies in females and pups (Matsumura, 1981).…”

Section: Discussionmentioning

confidence: 99%

Structure and variability of bat social calls: implications for specificity and individual recognition

2003

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Communication sounds or 'social calls' of 16 European bat species (Chiroptera, Vespertilionidae) were recorded at a range of roost and foraging sites. A comparative analysis of more than 5400 individual calls for general structures and for inter-as well as intraspecific variability resulted in 50 types of calls, which differed by their specific structure and by the calling species. These types could be grouped into four different general types of calls, according to the kind and complexity of their structure, independent of the calling species. Distinct types of calls seem to have similar functions in different bat species. One general type may be used predominantly in female-infant interactions as an isolation or direction call, which serves as mutual recognition. This type of social call was also used in 'tandem flights' of pairs of bats, which might increase individual knowledge of roost sites and foraging success. A second type was used in mate attraction, and a further one in an aggressive context. The fourth one was used by hindered or distressed bats. The group of 'aggressive' calls is least variable, but the complex mating calls and isolation calls are very diverse. Species-specific sound structures were identified, which allowed a computational species distinction. The measured inter-individual variability of social calls should be significant for their functions in individual recognition. So, beyond common features concerning the frequency structure of bat social calls, interspecific differences, as well as the intraspecific variability of details of sonagraphic parameters, should elucidate the specific functions of the calls.

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Section: Discussionmentioning

confidence: 99%

Structure and variability of bat social calls: implications for specificity and individual recognition

2003

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“…The Mexican free-tailed bats used in this study, for example, live in caves where they congregate in large colonies that often number in the millions. They use a rich repertoire of communication calls that they use for a wide variety of social interactions (Balcombe, 1990;Balcombe and McCracken, 1992;French and Lollar, 2000). Caves are highly reverberant, and in this environment precedence would facilitate the perception of communication signals from other bats by allowing the bat to localize the first sound received.…”

Section: Precedence Occurs In Many Animalsmentioning

confidence: 99%

Reversible Inactivation of the Dorsal Nucleus of the Lateral Lemniscus Reveals Its Role in the Processing of Multiple Sound Sources in the Inferior Colliculus of Bats

2001

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Neurons in the inferior colliculus (IC) that are excited by one ear and inhibited by the other [excitatory-inhibitory (EI) neurons] can code interaural intensity disparities (IIDs), the cues animals use to localize high frequencies. Although EI properties are first formed in a lower nucleus and imposed on some IC cells via an excitatory projection, many other EI neurons are formed de novo in the IC. By reversibly inactivating the dorsal nucleus of the lateral lemniscus (DNLL) in Mexican free-tailed bats with kynurenic acid, we show that the EI properties of many IC cells are formed de novo via an inhibitory projection from the DNLL on the opposite side. We also show that signals excitatory to the IC evoke an inhibition in the opposite DNLL that persists for tens of milliseconds after the signal has ended. During that period, strongly suppressed EI cells in the IC are deprived of inhibition from the DNLL and respond to binaural signals as weakly inhibited or monaural cells. By relieving inhibition at the IC, we show that an initial binaural signal essentially reconfigures the circuit and thereby allows IC cells to respond to trailing binaural signals that were inhibitory when presented alone. Thus, DNLL innervation creates a property in the IC that is not possessed by lower neurons or by collicular EI neurons that are not innervated by the DNLL. That property is a change in responsiveness to binaural signals, a change dependent on the reception of an earlier sound. These features suggest that the circuitry linking the DNLL with the opposite central nucleus of the IC is important for the processing of IIDs that change over time, such as the IIDs generated by moving stimuli or by multiple sound sources that emanate from different regions of space. Key words: GABA; persistent inhibition; precedence effect; inferior colliculus; sound localization; dorsal nucleus of lateral lemniscusThe projections from the vast majority of lower auditory nuclei converge at a common destination in the central nucleus of the inferior colliculus (ICc) (for review, see Aitkin, 1986;Oliver and Huerta, 1992). This large convergence of inputs suggests that substantial transformations occur in the ICc; yet the response properties of ICc neurons appear to be similar to those of the lower nuclei from which they receive their innervation. An example is excitatory-inhibitory (EI) neurons in the ICc, neurons that are excited by one ear and inhibited by the other ear. These neurons are sensitive to interaural intensity disparities (IIDs), the cues animals use to localize high-frequency sounds (Erulkar, 1972;Mills, 1972). EI neurons are initially formed in the lateral superior olive (LSO) (Boudreau and Tsuchitani, 1968;Finlayson and Caspary, 1991). They are also the dominant type in the dorsal nucleus of the lateral lemniscus (DNLL), a nucleus the neurons of which are almost exclusively GABAergic (Brugge et al., 1970;Adams and Mugniani, 1984;Covey, 1993; Yang and Pollak, 1994a,b,c;Winer et al., 1995). The DNLL, like the ICc, is one of the principa...

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“…This species was used in the current study for this and several additional reasons. Like other microchiropteran bats, Mexican free-tailed bats rely on their sense of hearing for echolocation and social interactions, which are mediated in part by an extensive repertoire of vocalizations (Balcombe and McCracken, 1992;Lollar, 1998, 2000). Reflecting this, the inferior colliculus is hypertrophied relative to that of many other groups of mammal, yet the patterns of serotonergic innervation within the IC are quite similar to those described in other species (Klepper and Herbert, 1991;Kaiser and Covey, 1997;Hurley and Thompson, 2001).…”

Section: Introductionmentioning

confidence: 99%

Activation of the serotonin 1A receptor alters the temporal characteristics of auditory responses in the inferior colliculus

Hurley

2007

Brain Research

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Serotonin, like other neuromodulators, acts on a range of receptor types, but its effects also depend on the functional characteristics of the neurons responding to receptor activation. In the inferior colliculus (IC), an auditory midbrain nucleus, activation of a common serotonin (5-HT) receptor type, the 5-HT 1A receptor, depresses auditory-evoked responses in many neurons. Whether these effects occur differentially in different types of neurons is unknown. In the current study, the effects of iontophoretic application of the 5-HT 1A agonist 8-OH-DPAT on auditory responses were compared with the characteristic frequencies (CFs), recording depths, and control first-spike latencies of the same group of IC neurons. The 8-OH-DPAT-evoked change in response significantly correlated with first-spike latency across the population, so that response depressions were more prevalent in longer-latency neurons. The 8-OH-DPAT-evoked change in response did not correlate with CF or with recording depth. 8-OH-DPAT also altered the temporal characteristics of spike trains in a subset of neurons that fired multiple spikes in response to brief stimuli. For these neurons, activation of the 5-HT 1A receptor suppressed lagging spikes proportionally more than initial spikes. These results suggest that the 5-HT 1A receptor, by affecting the timing of the responses of both individual neurons and the neuron population, shifts the temporal profile of evoked activity within the IC.

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Vocal recognition in mexican free-tailed bats: do pups recognize mothers?

Cited by 105 publications

References 17 publications

Structure and variability of bat social calls: implications for specificity and individual recognition

Structure and variability of bat social calls: implications for specificity and individual recognition

Reversible Inactivation of the Dorsal Nucleus of the Lateral Lemniscus Reveals Its Role in the Processing of Multiple Sound Sources in the Inferior Colliculus of Bats

Activation of the serotonin 1A receptor alters the temporal characteristics of auditory responses in the inferior colliculus

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