Abstract
We examined peripheral and central nervous cues underlying the ability of the bushcricket Leptophyes punctatissima to orient to elevated and depressed sound sources broadcasting the female acoustic reply. The peripheral spatial directionality of the ear was measured physiologically using monaural preparations of an auditory interneuron (T-fibre). In the azimuth, maximal interaural intensity differences of 18 dB occur between ipsi- and contralateral stimulation. With increasing elevation or depression of the sound sources, IIDs decrease systematically and reach zero with the source exactly above or below the preparation. Bilateral, simultaneous recordings of the activity of the pair of interneurons allowed determining the binaural discharge differences which occur in response to the extremely short (1 ms) female reply. These discharge differences are large (four action potentials/stimulus) and reliable in the azimuth with lateral stimulation, and decrease gradually with more frontal stimulation. With elevation and depression of sound sources these differences again decrease to one action potential/stimulus at 60° or 75° elevation, and lateral stimulus angles of about 60°. We also calculated the reliability with which a receiver could correctly determine the location of the sound source. We discuss these quantitative measures in relation to the spatial phonotactic behaviour of male L. punctatissima.
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Abbreviations
- IID:
-
Interaural intensity difference
- SPL:
-
Sound pressure level
References
Blauert J (1983) Spatial hearing. The psychophysics of human sound localization, 2nd edn. MIT Press, Cambridge
Butler RA, Belendiuk K (1977) Spectral cues utilized in the localization of sound in the medial sagittal plane. J Acoust Soc Am 61:1264–1269
Ebendt R, Friedel J, Kalmring K (1994) Central projection of auditory receptors in the prothoracic ganglion of the bushcricket Psorodonotus illyricus (Tettigoniidae): computer-aided analysis of the end branching pattern. J Neurobiol 25:35–49
Faure PA, Hoy RR (2000a) Neuroethology of the katydid T-Cell. I. Tuning and responses to pure tones. J Exp Biol 203:3225–3242
Faure PA, Hoy R (2000b) Neuroethology of the katydid T-Cell. II. Responses to acoustic playback of conspecific and predatory signals. J Exp Biol 203:3243–3254
Fuzessery ZM (1996) Monaural and binaural spectral cues created by the external ears of the pallid bat. Hear Res 95:1–17
Gerhardt HC, Huber F (2002) Acoustic communication in insects and anurans: common problems and diverse solutions. The University of Chicago Press, Chicago
Gerhardt HC, Rheinlaender J (1982) Localization of an elevated sound source by the green tree frog. Science 217:663–664
Hardt M (1988) Zur Phonotaxis von Laubheuschrecken: Eine vergleichende verhaltensphysiologische und neurophysiologisch-anatomische Untersuchung. PhD Thesis, Ruhr-University Bochum
Hartley JC, Robinson DJ (1976) Acoustic behaviour of both sexes of the speckled bush cricket Leptophyes punctatissima. Physiol Entomol 1:21–25
Hoy RR, Robert D (1996) Tympanal hearing in insects. Ann Rev Entomol 41:433–450
Knudsen EI, Konishi M (1979) Mechanism of sound localization in the barn owl. J Comp Physiol 133:13–21
Konishi M (2003) Coding of auditory space. Annu Rev Neurosci 26:31–55
McKay JM (1969) The auditory system of Homorocoryphus (Tettigonioidea, Orthoptera). J Exp Biol 51:787–802
Mörchen A, Rheinlaender J, Schwartzkopff J (1978) Latency shift in insect auditory nerve fibers. Naturwiss 65:656
Müller P, Robert D (2001) A shot in the dark. The silent quest of a free-flying phonotactic fly. J Exp Biol 204:1039–1052
Ofner E, Rheinlaender J, Römer H (2007) Spatial orientation in the bushcricket Leptophyes punctatissima (Phaneropterinae; Orthoptera): II. Phonotaxis to elevated sound sources on a walking compensator. J Comp Physiol A 193:321–330
Oshinsky ML, Hoy RR (2002) Physiology of the auditory afferents in an acoustic parasitoid fly. J Neurosci 22:7254–7263
Payne RS, Roeder KD, Wallmann J (1966) Directional sensitivity of the ears of noctuid moths. J Exp Biol 44:17–31
Popper AN, Fay RR (2005) Sound source localization. Springer handbook of auditory research, vol 25. Springer, Heidelberg
Pollack G (2000) Who, what, where? Recognition and localization of acoustic signals by insects. Curr Opin Neurobiol 10:763–767
Rheinlaender J, Hardt M, Robinson DJ (1986) The directional sensitivity of a bush cricket ear: a behavioural and neurophysiological study of Leptophyes punctatissima. Physiol Entomol 11:309–316
Rheinlaender J, Mörchen A (1979) “Time-intensity trading” in locust auditory interneurones. Nature (London) 281:672–674
Rheinlaender J, Römer H (1980) Bilateral coding of sound direction in the CNS of the bushcricket Tettigonia viridissima L. (Othoptera, Tettigoniidae). J Comp Physiol A 140:101–111
Rheinlaender J, Hartbauer M, Römer H (2007) Spatial orientation in the bushcricket Leptophyes punctatissima (Phaneropterinae; Orthoptera): I. Phonotaxis to elevated and depressed sound sources. J Comp Physiol A 193:313–320
Robinson DJ (1980) Acoustic communication between the sexes of the bush cricket Leptophyes punctatissima. Physiol Entomol 5:183–189
Robinson DJ, Rheinlaender J, Hartley JC (1986) Temporal parameters of male–female sound communication in Leptophyes punctatissima. Physiol Entomol 11:317–323
Römer H (1983) Tonotopic organization of the auditory neuropile in the bushcricket Tettigonia viridissima. Nature 306:60–62
Römer H, Marquart V, Hardt M (1988) Organization of a sensory neuropile in the auditory pathway of two groups of Orthoptera. J Comp Neurol 275:201–215
Samson AH, Pollack GS (2002) Encoding of sound localization cues by an identified auditory interneuron: effects of stimulus temporal pattern. J Neurophysiol 88:2322–2328
Schul J, Sheridan RA (2006) Auditory stream segregation in an insect. Neuroscience 138:1–4
Searle CL, Braida LD, Cuddy DR, Davis MF (1975) Binaural pinna disparity: another auditory localization cue. J Acoust Soc Am 57:448–455
Stumpner A (1996) Tonotopic organization of the hearing organ in a bushcricket—physiological characterization and complete staining of auditory receptor cells. Naturwiss 83:81–84
Stumpner A (1999) An interneurone of unusual morphology is tuned to the female song frequency in the bushcricket Ancistrura nigrovittata (Orthoptera, Phaneropterinae). J Exp Biol 202:2071–2081
Suga N, Katsuki Y (1961) Central mechanisms of hearing in insects. J Exp Biol 38:545–558
Wotton JM, Simmons JA (2000) Spectral cues and perception of the vertical position of targets by the big brown bat, Eptesicus fuscus. J Acoust Soc Am 107(2):1034–1041
Wyttenbach RA, Hoy RR (1997) Spatial acuity of ultrasound hearing in flying crickets. J Exp Biol 200:1999–2006
Zimmermann U, Rheinlaender J, Robinson DJ (1989) Cues for male phonotaxis in the duetting bushcricket Leptophyes punctatissima. J Comp Physiol A 164:621–628
Acknowledgments
Funding was provided by the Austrian Science Foundation (FWF), Project P14257-BIO to HR. The experiments reported in this paper comply with the current animal protection law in Austria.
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Kostarakos, K., Rheinlaender, J. & Römer, H. Spatial orientation in the bushcricket Leptophyes punctatissima (Phaneropterinae; Orthoptera): III. Peripheral directionality and central nervous processing of spatial cues. J Comp Physiol A 193, 1115–1123 (2007). https://doi.org/10.1007/s00359-007-0262-6
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DOI: https://doi.org/10.1007/s00359-007-0262-6