Peripheral auditory processing in the bobtail lizard Tiliqua rugosa

  title={Peripheral auditory processing in the bobtail lizard Tiliqua rugosa},
  author={Geoffrey A Manley and Christine K{\"o}ppl and Brian M. Johnstone},
  journal={Journal of Comparative Physiology A},
Summary1.Primary auditory-nerve fibres of the bobtail lizard have asymmetrical, V-shaped frequency-threshold tuning curves. Fibre characteristic frequencies (CF) ranged from 0.2 to 4.5 kHz. The most sensitive fibres had a CF near 1.2 kHz and a threshold of 6 dB SPL.2.Fibres with CFs below 0.85 kHz had simple U-shaped tuning curves; higher-CF fibres had tuning curves with obvious sharp tips around CF. These tips were up to 46 dB in depth. Several other parameters of the tuning curves, like the… 
The auditory brainstem response in two lizard species.
Hearing sensitivity extended over a larger frequency range in lizards than in most bird species, and thresholds from ABR audiograms were comparable to those of small birds.
Binaural processing by the gecko auditory periphery.
The neural response accurately reflects tympanic directionality, and most neurons in the auditory pathway should be directional, as well as best ITD and click delays match interaural transmission delays.
Diverse Mechanisms of Sound Frequency Discrimination in the Vertebrate Cochlea
Calcium modulates the frequency and amplitude of spontaneous otoacoustic emissions in the bobtail skink.
Active processes in the inner ear of lizards can be monitored using spontaneous otoacoustic emissions (SOAE) measured outside the eardrum. In the Australian bobtail lizard, SOAE are generated by an
Effects of age and size in the ears of gekkonomorph lizards: middle-ear sensitivity.
The dependence of these transfer function variables on animal and ear size was similar, regardless of whether the comparison was among adults of species of different sizes, or among age classes within a species, so that age differences appear to be largely the result of size differences.


Auditory nerve fibre activity in the Tokay gecko
Comparison of results and analogous frequency shifts with temperature reported for other auditory organs suggests that tuning in the mammalian cochlea is less temperature-dependent than it is in nonmammalian inner ears; this may reflect a basic difference in how tuning is achieved.
Discharge properties of primary auditory fibres in caiman crocodilus: Comparisons and contrasts to the mammalian auditory nerve
Single fibre recordings were performed from the auditory nerve of the caiman, Caiman crocodilus, and similarities and differences were found in comparison to the mammalian cochlea.
Peripheral auditory processing in the bobtail lizard Tiliqua rugosa
It is suggested that the previous results represent an artefactual variation in hearing ability due to the use of standard anaesthetic doses causing a variable physiological state of the experimental animals.
Response patterns and peripheral origin of auditory nerve fibers in the monitor lizard,Varanus bengalensis
  • G. Manley
  • Biology
    Journal of comparative physiology
  • 2004
Summary1.The activity patterns of primary auditory nerve fibers inV. bengalensis were studied with microelectrode recordings from the proximal and distal portions of the nerve.2.Spontaneous firing
Relations between frequency selectivity and two-tone rate suppression in lizard cochlear-nerve fibers
Boundaries of two-tone rate suppression of cochlear-nerve activity
Unit responses from the lizard auditory nerve.
Micromechanical Basis of High-Frequency Tuning in the Bobtail Lizard
A comprehensive and comparative understanding of tuning mechanisms and their integration in the hearing organs of different vertebrate classes requires the detailed investigation of a greater variety of morphological types of inner ear.