@article{HagemannVaterKoessl2011,
  author    = {Hagemann, Cornelia and Vater, Marianne and Koessl, Manfred},
  title     = {Comparison of properties of cortical echo delay-tuning in the short-tailed fruit bat and the mustached bat},
  series = {Journal of comparative physiology : A, Neuroethology, sensory, neural, and behavioral physiology},
  volume    = {197},
  journal   = {Journal of comparative physiology : A, Neuroethology, sensory, neural, and behavioral physiology},
  number    = {5},
  publisher = {Springer},
  address   = {New York},
  issn      = {0340-7594},
  doi       = {10.1007/s00359-010-0530-8},
  pages     = {605 -- 613},
  year      = {2011},
  abstract  = {Target-distance computation by cortical neurons sensitive to echo delay is an essential characteristic of the auditory system of insectivorous bats. To assess if functional requirements such as detection of small insects versus larger stationary surfaces of plants are reflected in cortical properties, we compare delay-tuned neurons in a frugivorous (C. perspicillata, CP) and an insectivorous (P. parnellii, PP) bat species that belong to related families within the superfamily of Noctilionoidea. The bandwidth and shape of delay-tuning curves and the range of characteristic delays are similar in both species and hence are not related to different echolocation strategies. Most units respond at 2-6 ms echo delay with most sensitive thresholds of 20-30 dB SPL. In CP, units tuned to delays > 12 ms are slightly more abundant and are more sensitive than in PP. All delay-tuned neurons in CP reliably respond to single pure-tone stimuli, whereas such responses are only observed in 49\% of delay-tuned units in PP. The cortical representation of echo delay (chronotopy) covers a larger area in CP but is less precise than described in PP. Since chronotopy is absent in certain other insectivorous bat species, it is open if these differences in topography are related to echolocation behaviour.},
  language  = {en}
}
@article{VaterKoessl2011,
  author    = {Vater, Marianne and Koessl, Manfred},
  title     = {Comparative aspects of cochlear functional organization in mammals},
  series = {Hearing research},
  volume    = {273},
  journal   = {Hearing research},
  number    = {1-2},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0378-5955},
  doi       = {10.1016/j.heares.2010.05.018},
  pages     = {89 -- 99},
  year      = {2011},
  abstract  = {This review addresses the functional organization of the mammalian cochlea under a comparative and evolutionary perspective. A comparison of the monotreme cochlea with that of marsupial and placental mammals highlights important evolutionary steps towards a hearing organ dedicated to process higher frequencies and a larger frequency range than found in non-mammalian vertebrates. Among placental mammals, there are numerous cochlear specializations which relate to hearing range in adaptation to specific habitats that are superimposed on a common basic design. These are illustrated by examples of specialist ears which evolved excellent high frequency hearing and echolocation (bats and dolphins) and by the example of subterranean rodents with ears devoted to processing low frequencies. Furthermore, structural functional correlations important for tonotopic cochlear organization and predictions of hearing capabilities are discussed.},
  language  = {en}
}