@article{FleischmannGrobRoessler2022,
  author    = {Fleischmann, Pauline N. and Grob, Robin and R{\"o}ssler, Wolfgang},
  title     = {Magnetosensation during re-learning walks in desert ants (Cataglyphis nodus)},
  series = {Journal of Comparative Physiology A},
  volume    = {208},
  journal   = {Journal of Comparative Physiology A},
  number    = {1},
  issn      = {1432-1351},
  doi       = {10.1007/s00359-021-01511-4},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-266556},
  pages     = {125-133},
  year      = {2022},
  abstract  = {At the beginning of their foraging careers, Cataglyphis desert ants calibrate their compass systems and learn the visual panorama surrounding the nest entrance. For that, they perform well-structured initial learning walks. During rotational body movements (pirouettes), na{\"i}ve ants (novices) gaze back to the nest entrance to memorize their way back to the nest. To align their gaze directions, they rely on the geomagnetic field as a compass cue. In contrast, experienced ants (foragers) use celestial compass cues for path integration during food search. If the panorama at the nest entrance is changed, foragers perform re-learning walks prior to heading out on new foraging excursions. Here, we show that initial learning walks and re-learning walks are structurally different. During re-learning walks, foragers circle around the nest entrance before leaving the nest area to search for food. During pirouettes, they do not gaze back to the nest entrance. In addition, foragers do not use the magnetic field as a compass cue to align their gaze directions during re-learning walk pirouettes. Nevertheless, magnetic alterations during re-learning walks under manipulated panoramic conditions induce changes in nest-directed views indicating that foragers are still magnetosensitive in a cue conflict situation.},
  language  = {en}
}
@article{NguyenBeetzMerlinetal.2022,
  author    = {Nguyen, Tu Anh Thi and Beetz, M. Jerome and Merlin, Christine and Pfeiffer, Keram and el Jundi, Basil},
  title     = {Weighting of celestial and terrestrial cues in the monarch butterfly central complex},
  series = {Frontiers in Neural Circuits},
  volume    = {16},
  journal   = {Frontiers in Neural Circuits},
  issn      = {1662-5110},
  doi       = {10.3389/fncir.2022.862279},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-279445},
  year      = {2022},
  abstract  = {Monarch butterflies rely on external cues for orientation during their annual long-distance migration from Northern US and Canada to Central Mexico. These external cues can be celestial cues, such as the sun or polarized light, which are processed in a brain region termed the central complex (CX). Previous research typically focused on how individual simulated celestial cues are encoded in the butterfly's CX. However, in nature, the butterflies perceive several celestial cues at the same time and need to integrate them to effectively use the compound of all cues for orientation. In addition, a recent behavioral study revealed that monarch butterflies can rely on terrestrial cues, such as the panoramic skyline, for orientation and use them in combination with the sun to maintain a directed flight course. How the CX encodes a combination of celestial and terrestrial cues and how they are weighted in the butterfly's CX is still unknown. Here, we examined how input neurons of the CX, termed TL neurons, combine celestial and terrestrial information. While recording intracellularly from the neurons, we presented a sun stimulus and polarized light to the butterflies as well as a simulated sun and a panoramic scene simultaneously. Our results show that celestial cues are integrated linearly in these cells, while the combination of the sun and a panoramic skyline did not always follow a linear integration of action potential rates. Interestingly, while the sun and polarized light were invariantly weighted between individual neurons, the sun stimulus and panoramic skyline were dynamically weighted when both stimuli were simultaneously presented. Taken together, this dynamic weighting between celestial and terrestrial cues may allow the butterflies to flexibly set their cue preference during navigation.},
  language  = {en}
}