Abstract
Since their discovery, naked mole-rats have been speaking to us. Early field studies noted their extensive vocalizations, and scientists who are fortunate enough to spend time with these creatures in the laboratory setting cannot help but notice their constant peeping, chirruping and grunting (Hill et al., Proc Zool Soc Lond 128:455–514, 1957). Yet, few dwell on the function of these chirps and peeps, being instead drawn to the many other extraordinary aspects of naked mole-rat physiology detailed throughout this book. Still, no biology is complete without a description of how an organism communicates. While the field of naked mole-rat bioacoustics and acoustic communication has been largely silent for many years, we highlight recent progress in understanding how and what Heterocephalus glaber hears and which vocalizations it uses. These efforts are essential for a complete understanding of naked mole-rat cooperation, society and even culture.
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Abbreviations
- ABR:
-
auditory brainstem response
- AC:
-
auditory cortex
- AVCN:
-
anterior ventral cochlear nucleus
- BK channel:
-
big potassium channel
- CN:
-
cochlear nucleus
- DCN:
-
dorsal cochlear nucleus
- DNLL:
-
dorsal nucleus of the lateral lemniscus
- GluR:
-
glutamate receptor
- GlyT2:
-
glycine transporter 2
- HCN1:
-
Hyperpolarization-activated cyclic nucleotide-gated channel 1
- HM:
-
head of malleus
- IC:
-
inferior colliculus
- IHC:
-
inner hair cells
- KV1.1:
-
Potassium voltage-gated channel subfamily A member 1
- LPI:
-
long process of the incus
- LSO:
-
lateral superior olive
- MGN:
-
medial geniculate nucleus
- MM:
-
manubrium of malleus
- MNTB:
-
medial nucleus of the trapezoid body
- mPFC:
-
medial prefrontal cortex
- MSO:
-
medial superior olive
- Na,K-ATPase α3:
-
sodium/potassium-ATPase (Na+/K+-ATPase)
- OHC:
-
outer hair cells
- PVCN:
-
posterior ventral cochlear nucleus
- SGN:
-
spiral ganglion neurons
- SOC:
-
superior olivary complex
- SPI:
-
short process of the incus
- TM:
-
tympanic membrane
- TT:
-
tensor tympani tendon
- VCN:
-
ventral cochlear nucleus
- vGluT1:
-
vesicular glutamate transporter 1
- VNLL:
-
ventral nucleus of the lateral lemniscus
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Acknowledgements
The work in the authors‘ laboratories has been supported by the following agencies: the University of Groningen (the Netherlands) and the Heinsius-Houbolt Foundation to SJP and ERC advanced grants to GRL (AdG 789128 and AdG 294678).
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Glossary
- Fundamental frequency
-
lowest frequency of a periodic waveform. This is usually the lowest frequency in a harmonic sound.
- Hyperpolarization-activated cyclic nucleotide gated (HCN) 1 channels
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HCN channels are a family of voltage-gated ion channels that open upon hyperpolarization and are modulated by cAMP inside the neuron. They are permeable for Na+-ions and to a lesser extent to K+-ion and are thus depolarizing and can induce pacemaker activity. Among the four isoforms the HCN1 channels are t activated at the most depolarized voltage (around -45 mV) and have the fastest activation time constants.
- Kv1 channels
-
Kv1 channels are a family of voltage-gated ion channels that are permeable for K+-ions and thus hyperpolarizing. Compared to other voltage-gated K+-channels they are activated at more hyperpolarized voltages, closer to the membrane resting potential.
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Barker, A.J., Koch, U., Lewin, G.R., Pyott, S.J. (2021). Hearing and Vocalizations in the Naked Mole-Rat. In: Buffenstein, R., Park, T.J., Holmes, M.M. (eds) The Extraordinary Biology of the Naked Mole-Rat. Advances in Experimental Medicine and Biology, vol 1319. Springer, Cham. https://doi.org/10.1007/978-3-030-65943-1_6
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