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- W4225757410 abstract "In this doctoral thesis intracellular recordings of identified auditory neurons in the brain of a bush cricket are presented for the first time. Single cell recordings were carried out in the species Ancistrura nigrovittata (Brunner von Wattenwyl, 1878) with special emphasis on filtering properties for the conspecific song. The coding of carrier frequency, intensity and temporal pattern was examined in local brain neurons and in intersegmental neurons for a comparison with the behavioural responses to these parameters. Spike activity of five types of ascending intersegmental neurons was acquired from the axonal terminals, which allowed a correlation to earlier results obtained from the dendrites. The response characteristics found in both recording sites are widely similar (closest in AN3), although differences have been observed. These are e.g.: (i) filter properties in the spike activity of AN1 and AN2 to some pulse durations, which closely correlate to the female behaviour (ii) graded potentials in TN1 s axon with the capability to facilitate the amplitude of action potentials in a graded manner close to the presynaptic output site (iii) a physiological and a morphological description in the brain, of a so far unknown intersegmental neuron (ANx) that processes ultrasound stimuli. A characterisation of ten types of local auditory brain neurons is given, whereby novel as well as known response properties with a surprisingly high degree of redundant filter mechanisms are found. These are e.g.: (i) a spike frequency filter and a redundant frequency dependent inhibition in LBN1 resulting in a response that has a closer correlation to the female behaviour than found in the spiking of its presynaptic neuron (AN1) (ii) the narrowly tuned activity of LBN2 to conspecific signals of both sexes - representing a channel that indicates species specific communication in the surrounding area (iii) the tracing of auditory processing on subsequent levels up to a third order interneuron including a switch of excitation to inhibition (iv) a greater variety of selective responses to ultrasonic stimuli and temporal parameters than described for thoracic neurons (v) secondary spike activity following stimulation with a latency of ca. 600 ms and graded potentials exhibiting remarkably long time constants of several hundred milliseconds. Several of these mechanisms lead to a closer correspondence of neuronal activity to species specific behaviour than found in the thorax." @default.
- W4225757410 created "2022-05-05" @default.
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- W4225757410 date "2022-02-20" @default.
- W4225757410 modified "2023-10-01" @default.
- W4225757410 title "Filtering of species specific song parameters via interneurons in a bush cricket's brain" @default.
- W4225757410 doi "https://doi.org/10.53846/goediss-1372" @default.
- W4225757410 hasPublicationYear "2022" @default.
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