Showing papers by "Hermann Wagner published in 2021"
TL;DR: In this paper, the authors examined how much the wings, the P10 feather and the serrations in different populations of barn owls reflect the intact situation, and quantitatively assessed damage by counting the number of wings with missing or broken primary feathers.
2 citations
23 Nov 2021-Journal of Comparative Physiology A-neuroethology Sensory Neural and Behavioral Physiology
TL;DR: For instance, the authors showed that the horizontal optocollic response of adult barn owls is less asymmetric than that in the chicken for all velocities tested, and that the response is symmetric for low velocity ( ǫ40 deg/s) is not possible.
Abstract: Barn owls, like primates, have frontally oriented eyes, which allow for a large binocular overlap. While owls have similar binocular vision and visual-search strategies as primates, it is less clear whether reflexive visual behavior also resembles that of primates or is more similar to that of closer related, but lateral-eyed bird species. Test cases are visual responses driven by wide-field movement: the optokinetic, optocollic, and optomotor responses, mediated by eye, head and body movements, respectively. Adult primates have a so-called symmetric horizontal response: they show the same following behavior, if the stimulus, presented to one eye only, moves in the nasal-to-temporal direction or in the temporal-to-nasal direction. By contrast, lateral-eyed birds have an asymmetric response, responding better to temporal-to-nasal movement than to nasal-to-temporal movement. We show here that the horizontal optocollic response of adult barn owls is less asymmetric than that in the chicken for all velocities tested. Moreover, the response is symmetric for low velocities ( 40 deg/s) is not possible.
2 citations