Günter Kämper

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The auditory systems of several species of singing and acoustically communicating grasshoppers, as well as of silent grasshoppers, were compared with respect to the external structure of the tympana, thresholds of the tympanal nerve response and projection areas of tympanal nerves within the metathoracic part of the ventral nerve cord. Extracellular(More)
In addition to their high frequency stridulatory sound, crickets (Gryllus campestris) also produce low frequency airborne vibrations resulting from the strokes of the crickets' wings closing and opening during stridulation. Giant interneurons of the ventral cord, which receive inputs from cereal hairs, respond to these low frequencly components of cricket(More)
The role of positional information in synapse formation was studied in the cricket cercal sensory system by transplanting epidermis from one species of cricket to another. Strips of cercal epidermis containing identified sensory neurons were transplanted from a black donor species to a tan host species; the color difference was used to distinguish between(More)
Females of the digger wasp Liris niger Fabr. hunt crickets to provide food for their offspring by running with high velocity on the ground (>20–50 cm/s). Crickets are able to detect the running wasps by the air particle movement generated by the predator. We measured signals produced by running wasps using a microphone sensitive to air particle velocity.(More)
1. Ascending abdominal interneurons receiving inputs from the cerci were examined by stimulating the cerci with pulses of 30-Hz sound, a frequency that corresponds to the repetition rate of the syllables in the conspecific calling song. 2. 13 interneurons were morphologically identified and characterized physiologically. 3. Neurons showing little or no(More)
1. Filiform hairs of various lengths on the cerci of adult crickets vibrate in a sound field. These movements were measured with a photodetector for sound frequencies from 10 Hz to 200 Hz in the species Acheta domestica, Gryllus bimaculatus and Phaeophilacris spectrum. 2. With low air-particle velocities, the hair shafts were deflected sinusoidally from(More)
Mechanical oscillation properties of cricket (Acheta domesticus) filiform hair sensilla were measured at different larval stages, as an indication of larval sensory capacities and for comparison with data in the literature on central nervous changes during development. The hairs were stimulated by airborne vibration over a frequency range of 10 to 220 Hz.(More)
Crickets are known for their acoustic activity. The males generate species-specific sound signals by stridulating with the front wings. In the East African gryllid Phaeophilacris spectrum Saussure (Orthoptera: Gryllidae, Phalangopsinae), the males lack any stridulatory equipment on their forewings, but nevertheless perform a signalling wing-flicking with a(More)
Three identified interneurons of the cercal system were investigated electrophysiologically; these interneurons are sensitive only to stimulation of cercal filiform-hair sensilla by low-frequency sound. Measurement of the frequency ranges revealed cut-off frequencies between ca. 20 and 70 Hz. Analysis of the responses near threshold and at higher(More)
1. The synaptic connections made by identified sensory neurons were studied electrophysiologically in the cercal sensory system of the cricket (Acheta domestica). 2. The results confirmed that the synaptic connections made by a particular sensory neuron were correlated with the precise topographic projection of the sensory neurons and the location of the(More)