{"data":[{"source":"bio.acousti.ca","id":"58244","type":"article","title":"Peripheral auditory processing in the bobtail lizard Tiliqua rugosa III. Patterns of spontaneous and tone-evoked nerve-fibre activity","author":"K\u00f6ppl, Christine; Manley, Geoffrey A.","editor":null,"year":"1990","month":null,"journal":null,"booktitle":null,"series":null,"howpublished":null,"volume":null,"number":null,"pages":null,"chapter":null,"edition":null,"publisher":null,"organization":null,"institution":null,"school":null,"address":null,"type_of_work":null,"note":null,"isbn":null,"issn":null,"doi":"10.1007\/BF00192411","url":"http:\/\/link.springer.com\/10.1007\/BF00192411","attachments":"https:\/\/bio.acousti.ca\/sites\/default\/files\/bf00192411.pdf","keywords":"Auditory nerve; hearing; Lizard","abstract":"1. 70% of primary afferent fibres in the bobtail lizard were irregularly spontaneously active, with rates between 0.1 and 123.7 spikes\/s (mean of 31.2 spikes\/s). The rate distribution is bimodal. Mid-frequency fibres with lower thresholds tend to have higher spontaneous rates.\n\n2. About one third of all fibres show a more prominent mode in their inter-spike interval histogram than is to be expected from a quasi-Poisson distribution. Preferred intervals in the spontaneous discharge patterns were not normally seen; this is presumably due to the lack of exclusive innervation of hair cells.\n\n3. Primary fibres mostly responded to sound with a discharge rate increase. The form of the peri-stimulustime histogram varies between fibres; three different response types are described. Fibres of low characteristic frequency (CF up to 0.65 kHz) show a characteristic change in their response pattern with stimulation frequency; it is suggested that primary suppression plays an important role in shaping the very phasic response to tones at the fibres' upper frequency range. The responses of higher-CF fibres (CF 0.55\u20134 kHz) are independent of stimulation frequency. About one third of them shows a primary-like discharge pattern. The majority, however, responds with a chopper-like discharge pattern and there is evidence that this discharge, as in mammalian cochlear-nucleus stellate cells, originates from temporal summation.\n\n4. The systematically-varying response pattern typical for low-CF fibres introduces special difficulties in defining the extent of the excitatory tuning curve and of the two-tone rate suppression area. The influence of threshold criteria on the overlap seen between both curves is discussed.","type_name":"Journal Article","journal_abbreviation":null,"pmid":null,"info_url":"https:\/\/bio.acousti.ca\/node\/58244"}]}