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The Repertoire of Communication Calls Emitted by Bats and the Ways the Calls Are Processed in the Inferior Colliculus

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Animal Models of Speech and Language Disorders

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Abstract

Bats have among the richest and most sophisticated repertoire of vocal communication calls of any mammalian group. In this review, we first describe the range of calls bats emit and the acoustic features that comprise their calls. Of particular importance are frequency modulations (FMs), as these are components in the vast majority of bats’ communication calls as well as the calls they emit for echolocation. We then consider the processing of communication calls in the inferior colliculus (IC). We show that neurons in the IC are selective for the various calls the bats emit and that this selectivity is shaped by inhibition. Computational studies showed that some neurons had one feature or filter characterized by its spectrotemporal receptive field (STRF) generated by spike-triggered averaging. In these cells, convolving conspecific calls with the STRF provides an accurate prediction of their responses to conspecific calls. Moreover a single linear combination of the excitatory and inhibitory fields explains their responses to the direction and velocity of FM sweeps. Most IC cells, however, had several spectrotemporal filters. In these cells, the nonlinear combination of two or more filters predicted the cell’s selectivity for FM sweeps and its responses to calls. The ways in which excitation and inhibition interacted to generate FM selectivity were also evaluated with in vivo whole-cell recordings. Those studies showed that the relative timing of excitation and inhibition had only a small influence on the amplitudes of the excitatory postsynaptic potentials (EPSPs) evoked by an FM signal. How the change in EPSP amplitude influenced discharge probability depended in large part on how close the EPSP was to spike threshold. If the EPSP amplitude is far from threshold, even timing changes of several ms would have little or no effect on spike probability. Conversely, if the EPSP amplitude is near threshold, then even a change in EPSP amplitude as small as a fraction of a millivolt could affect discharge probability and thus modulate the cell’s spiking directional selectivity. Taken together, these studies showed that neurons in the auditory midbrain encode specific spectrotemporal features of natural communication sounds by means of their selectivity to FM features present in their conspecific calls.

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Authors and Affiliations

  1. Section of Neurobiology, Center for Perceptual Systems, The University of Texas at Austin, Austin, TX, USA

    George D. Pollak Ph.D. & Sari Andoni Ph.D.

  2. Florida International University, Miami, FL, USA

    Kirsten Bohn M.S., Ph.D.

  3. Department of Science, Washington State University, Vancouver, WA, USA

    Joshua X. Gittelman Ph.D.

Authors
  1. George D. Pollak Ph.D.
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  2. Sari Andoni Ph.D.
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  3. Kirsten Bohn M.S., Ph.D.
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  4. Joshua X. Gittelman Ph.D.
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Correspondence to George D. Pollak Ph.D. .

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Editors and Affiliations

  1. Department of Neurology, Methodist Hospital Research Institute, Houston, Texas, USA

    Santosh A. Helekar

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Pollak, G.D., Andoni, S., Bohn, K., Gittelman, J.X. (2013). The Repertoire of Communication Calls Emitted by Bats and the Ways the Calls Are Processed in the Inferior Colliculus. In: Helekar, S. (eds) Animal Models of Speech and Language Disorders. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8400-4_8

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