Peter Teglberg Madsen, Aarhus University: Functional convergence in bat and toothed whale echolocation

Talk Peter Teglberg Madsen, Seewiesen

  • Datum: 21.02.2019
  • Uhrzeit: 13:00 - 14:00
  • Vortragender: Prof. Dr. Peter Teglberg Madsen
  • Aarhus University
  • Ort: Seewiesen
  • Raum: Seminar Room House 4, Tea & Coffee 12:30h
  • Gastgeber: Dr. Holger Goerlitz
  • Kontakt:
<i>Peter Teglberg Madsen, Aarhus University: </i>Functional convergence in bat and toothed whale echolocation
Echolocation is a process where bats and toothed whales must emit sound to generate echoes returning to their auditory systems for processing, meaning that they control sensory information flow by the rate, type and direction of the sounds they produce as well as by adjusting the sensitivity of their hearing. These parameters directly influence the temporal resolution and spatial extent of their perception of their environment, enabling dynamic control of attention in response to environmental complexity and behavioral objectives. Thus, the way that echolocating animals manipulate their perception of the surrounding environment is revealed by the sonar pulses they emit, the echoes they receive and the evoked behavioral changes; all of which can now be sampled by small archival tags attached to both bats and toothed whales during dark hunts in the wild. It appears that this form of active sensing in two very different media of air and water show a remarkable level of functional convergence in terms of sampling rates, acoustic gaze adjustments and frequency ranges. Conversely, in other aspects of their sensory ecology, bats and toothed whales diverge by having extreme versions of reactive versus deliberate modes of sensory-motor operation due to very different relationships between sensory volume and forward speed. I will argue that echolocating bats and toothed whales are ideal experimental models for studying sensory and cognitive adaptations that confer advantages in handling a dynamic sensory umwelt in time and space, providing a unique, non-invasive insight into perception in naturally behaving animals.
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