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Species-specificity of temporal processing in the auditory midbrain of gray treefrogs: interval-counting neurons

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Abstract

Interval-counting neurons (ICNs) respond after a threshold number of sound pulses have occurred with specific intervals; a single aberrant interval can reset the counting process. Female gray treefrogs, Hyla chrysoscelis and H. versicolor, discriminate against synthetic ‘calls’ possessing a single interpulse interval 2–3 three times the optimal value, suggesting that ICNs are important for call recognition. The calls of H. versicolor consist of pulses that are longer in duration, rise more slowly in amplitude and are repeated at a slower rate than those of H. chrysoscelis. Results of recordings from midbrain auditory neurons in these species include: (1) ICNs were found in both species and their temporal selectivity appeared to result from interplay between excitation and inhibition; (2) band-pass cells in H. versicolor were tuned to slower pulse rates than those in H. chrysoscelis; (3) ICNs that were selective for slow-rise pulse shape were found almost exclusively in H. versicolor, but fast-rise-selective neurons were found in both species, and (4) band-suppression ICNs in H. versicolor showed response minima at higher pulse rates than those in H. chrysoscelis. Selectivity of midbrain ICNs for pulse rise time and repetition rate thus correlate well with discriminatory abilities of these species that promote reproductive isolation.

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Abbreviations

ICN:

Interval-counting neuron

ICanuran :

Anuran inferior colliculus

AM:

Amplitude modulation

SAM:

Sinusoidal amplitude modulation

SPL:

Sound pressure level in decibels (dB), re 2 × 10−5 N/m2

EPSP:

Excitatory postsynaptic potential

IPSP:

Inhibitory postsynaptic potential

BEF:

Best excitatory frequency

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Acknowledgments

We thank H.C. Gerhardt, J. Schwartz and their colleagues for providing the animals used in this study. We also thank Stephen Odom and Caleb Herrick for assisting in experiments and data processing. This work was supported by a grant from NIDCD.

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Correspondence to Gary J. Rose.

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Rose, G.J., Hanson, J.L., Leary, C.J. et al. Species-specificity of temporal processing in the auditory midbrain of gray treefrogs: interval-counting neurons. J Comp Physiol A 201, 485–503 (2015). https://doi.org/10.1007/s00359-015-0997-4

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  • DOI: https://doi.org/10.1007/s00359-015-0997-4

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