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@PHDTHESIS{Harmening:50052,
      author       = {Harmening, Wolf Maximilian},
      othercontributors = {Wagner, Hermann},
      title        = {{F}undamentals of spatial vision in the barn owl ({T}yto
                      alba pratincola) : ocular aberrations, grating acuity,
                      contrast sensitivity, and vernier acuity},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-112616},
      pages        = {VI, 111 S. : Ill., graph. Darst.},
      year         = {2008},
      note         = {Aachen, Techn. Hochsch., Diss., 2008},
      abstract     = {Optical quality in barn owl eyes was measured with a
                      standard Tscherning-type wavefront aberrometer. The results
                      revealed that barn owl eyes have excellent optical quality.
                      Higher-order aberrations were about 3-fold lower than has
                      been reported in human eyes with similar methods and under
                      comparable conditions. The spatial contrast sensitivity
                      function (CSF) of the barn owl was measured in several
                      psychophysical experiments with an orientation
                      discrimination task. As in humans and virtually any other
                      animal, the CSF of the barn owl rendered the typical
                      band-limited inverted u-shaped function, with attenuated
                      sensitivities for high and low spatial frequencies. Maximal
                      sensitivity of about 20 was at a spatial frequency of about
                      1 cyc/deg. With a similar discrimination task, rating acuity
                      was measured in a separate behavioral experiment. The
                      results, 3.7 cyc/deg, are in good agreement with the
                      high-frequency cut-off of the CSF, and put the barn owl on
                      the very low end of the acuity spectrum compared to other
                      owls and birds. The barn owl displays discrimination
                      thresholds in psychophysical vernier acuity experiments that
                      are substantially lower than the resolution limit derived
                      from the high-frequency cut-off of the behavioral and
                      electrophysiological CSF. Moreover, the thresholds were also
                      lower than the behaviorally measured grating acuity, and
                      than theoretical values derived from an anatomical study of
                      the bird’s retina. It is concluded, that vernier acuity is
                      a hyperacute percept in the barn owl. Vernier acuity
                      thresholds of the barn owl seem to be similarly influenced
                      by the choice of stimulus configuration and viewing
                      conditions as it is the case in human observers.
                      Specifically, vernier thresholds were worse in a crowded
                      stimulus situation, and better under binocular viewing
                      conditions. The latter is referred to as binocular summation
                      in human subjects.},
      keywords     = {Binokulares Sehen (SWD) / Sehschärfe (SWD) / Kontrast
                      (SWD) / Visueller Kontrast (SWD) / Tiere (SWD) /
                      Tierphysiologie (SWD) / Psychophysik (SWD) / Augenheilkunde
                      (SWD)},
      cin          = {162110 / 160000},
      ddc          = {570},
      cid          = {$I:(DE-82)162110_20140620$ / $I:(DE-82)160000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-23108},
      url          = {https://publications.rwth-aachen.de/record/50052},
}