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  • 1
    Electronic Resource
    Electronic Resource
    Specific differences in sound production and pattern recognition in tettigoniids
    Amsterdam : Elsevier
    Behavioural Processes 31 (1994), S. 293-300 
    Details
    ISSN: 0376-6357
    Keywords: Female phonotaxis ; Song parameters ; Tettigoniids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0376-6357(94)90014-0
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  • 2
    Electronic Resource
    Electronic Resource
    Functional morphology of bushcricket ears: comparison between two species belonging to the Phaneropterinae and Decticinae (Insecta, Ensifera) (1994)
    Springer
    Zoomorphology 114 (1994), S. 39-46 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The morphology of the complex tibial organs in the forelegs of two bushcricket species belonging to the Phaneropterinae and Decticinae (Tettigoniidae) is described comparatively. In both species the tibial organs are made up of the subgenual organ, the intermediate organ and the crista acustica; the latter are parts of the tympanal organs and serve as auditory receptors. The very thin tympana in the forelegs ofPholidoptera griseoaptera (Decticinae) are protected by tympanal covers whereas inLeptophyes punctatissima (Phaneropterinae) the tympana are thicker and fully exposed. The overall auditory sensitivity ofL. punctatissima is lower and the sensitivity maximum of the hearing threshold lies at higher frequencies compared toP. griseoaptera. The number of scolopidia in the three scolopale organs and the dimensions of parts of the sound conducting system differs in the two species. In the crista acustica ofL. punctatissima a higher number of scolopidia is distributed in a smaller range than inP. griseoaptera; the scolopidia are especially concentrated in the distal part. Morphometrical analyses indicate that the dimensions of the spiracles, the acoustic trachea and the tympana determine the overall auditory sensitivity and that the arrangement of the scolopidia and the dimensions of structures in the crista acustica affect the frequency tuning of the hearing threshold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574913
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Neuronal basis for spectral song discrimination in the bushcricket Tettigonia cantans (1999)
    Springer
    Journal of comparative physiology 184 (1999), S. 457-461 
    Details
    ISSN: 1432-1351
    Keywords: Key words Acoustic communication ; Sensory coding ; Receptor tuning ; Bushcricket ; Tettigonia cantans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Previous experiments demonstrated that in choice situations female Tettigonia cantans prefer signals with the conspecific spectrum over signals with the spectrum of the sibling species T. viridissima, whose signals lack the T. cantans-typical 8-kHz component but are otherwise identical in spectral composition. The underlying neuronal mechanisms were investigated using whole-nerve recordings of the tympanal nerve. Hearing thresholds did not differ significantly between the species in the range between 7 and 25 kHz. The responses of the tympanic nerve at 30 dB above threshold did, however, differ significantly between the species. While in T. viridissima response amplitudes did not differ between 7 and 12 kHz, in T. cantans responses at 8 kHz were significantly larger than at 10 and 12 kHz. Since possible influences of axonal diameters on response magnitudes were excluded, these results indicate that in T. cantans more receptor cells are tuned to 8 kHz than to 10–12 kHz, while in T. viridissima tuning of receptor cells is more evenly distributed. The higher response magnitude in T. cantans at 8 kHz than at 10–12 kHz is equivalent to an amplitude difference of 3.8–7 dB, which agrees well with previous behavioural estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050345
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  • 4
    Electronic Resource
    Electronic Resource
    Song recognition by temporal cues in a group of closely related bushcricket species (genus Tettigonia) (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 401-410 
    Details
    ISSN: 1432-1351
    Keywords: Key words Phonotaxis ; Bushcricket ; Temporal pattern recognition ; Tettigonia ; Species isolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Female phonotaxis of Tettigonia viridissima and T. caudata was investigated on a walking compensator to determine the temporal parameters of the male song used for song recognition, and to compare them with the previously described pulse rate filtering of T. cantans. The T. cantans song is continuous with a ≈30-Hz pulse rate. The T. caudata song has a higher pulse rate (≈40 Hz) and duty cycle than T. cantans and a distinct verse structure. The T. viridissima song is continuous with a double-pulse pattern. While the pulse rate is essential for song recognition in T. cantans, neither pulse rate not verse structure were essential for song recognition in T. caudata: females responded to signals above a minimum duty cycle. T. viridissima females did not require the double-pulse structure, but a single long pulse, equivalent to the duration of the double pulses and interval between them, was effective. Song attractiveness was limited by a minimum duration of the merged double pulse, and by minimum and maximum duration of the interval between them. Pulse rate recognition had little if any importance in either of the species investigated. Thus, the three congeners use different mechanisms for temporal song recognition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050266
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  • 5
    Electronic Resource
    Electronic Resource
    A quantitative analysis of behavioral selectivity for pulse rise-time in the gray treefrog, Hyla versicolor (1999)
    Springer
    Journal of comparative physiology 185 (1999), S. 33-40 
    Details
    ISSN: 1432-1351
    Keywords: Key words Acoustic communication ; Selective phonotaxis ; Temporal pattern discrimination ; Pulse rise-time ; Hyla versicolor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The selectivity of female phonotactic responses to synthetic advertisement calls was tested in choice situations. Preferences based on differences in the linear rise-time of synthetic pulses depended on intensity and carrier frequency. When the carrier frequency was 1.1 kHz, simulating the low-frequency peak in the advertisement call, females preferred alternatives with slower rise-time pulses that differed by 5 ms at playback levels of 75 dB SPL and higher. A rise-time difference of 10 ms was discriminated at 65 dB SPL. When the carrier frequency was 2.2 kHz, simulating the high-frequency peak in the call, females discriminated a 5-ms difference in rise-time only at 85 dB SPL. Females showed no preference when the difference was 10 ms at lower playback levels. The difference in the thresholds (about 15–20 dB) for discriminating differences in rise-time at the two carrier frequencies was greater than the difference in behavioral thresholds for these two frequencies (about 10 dB). This result suggests that rise-time discrimination can be mediated solely by the neural channel mainly tuned to the low-frequency peak in the call. Females probably assess differences in rise-time by comparing the first few pulses of each call rather than by averaging over the entire call.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050363
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  • 6
    Electronic Resource
    Electronic Resource
    Selective phonotaxis in Tettigonia cantans and T. viridissima in song recognition and discrimination (1998)
    Springer
    Journal of comparative physiology 182 (1998), S. 687-694 
    Details
    ISSN: 1432-1351
    Keywords: Key words Phonotaxis ; Pattern recognition ; Calling song ; Bushcricket Tettigonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The selectivity of female phonotaxis in Tettigonia cantans and T. viridissima was investigated on a Kramer treadmill, with respect to the specific differences in temporal pattern and spectrum of the songs of both species. In choice situations, both species preferred the conspecific song over the heterospecific one. The courses of both species were deflected by about 15–20° from the position of the conspecific song, that of T. viridissima being away from, that of T. cantans in the direction of the heterospecific song. In no-choice situations, song models with the temporal pattern of T. cantans did not attract T. viridissima. Models with the conspecific time pattern but heterospecific spectrum were as attractive as the conspecific model. In contrast, T. cantans was attracted by T. viridissima song presented alone. In choice situations, either spectral or temporal differences were sufficient for discrimination. The preference for the conspecific model gradually disappeared with stepwise reduction of its intensity and was reversed at −12 dB. Acoustic communication alone can serve species isolation in T. viridissima; however, premating isolation in T. cantans must involve other mechanisms. The orientation during the choice situations suggests a serial processing of song recognition and localization for the Tettigonia species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050213
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