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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
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Active smelling in the American cockroach.

Antoine Hoffmann1,2,3, Einat Couzin-Fuchs1,2,4

  • 1Department of Biology, University of Konstanz, 78457 Konstanz, Germany.

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American cockroaches actively move their antennae to detect odors, shifting them towards scent streams and increasing vertical movements. These antennal sweeps enhance odor capture and transport, crucial for navigation in low-airflow environments.

Keywords:
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Area of Science:

  • Animal behavior
  • Sensory biology
  • Neuroethology

Background:

  • Animal movement is crucial for acquiring sensory information, particularly in olfaction.
  • Active sensing involves controlling movement to optimize sensory input, influencing odour sampling and molecular flow.

Purpose of the Study:

  • To investigate how insect antennae interact with the olfactory environment.
  • To analyze antennal kinematics in American cockroaches during odour presentation.

Main Methods:

  • Spatiotemporal analysis of antennal kinematics.
  • Experiments conducted in a wind-tunnel setup with American cockroaches.
  • Presentation of odours with varying attractivity levels (colony extract, butanol, linalool).

Main Results:

  • Significant changes in antennal kinematics observed upon odour presentation, including shifts towards the odour stream and increased vertical movement.
  • Antennal shifting was predominantly unilateral, while the overall range of both antennae remained consistent.
  • Findings were consistent for static and moving stimuli, with more pronounced effects for attractive odours.
  • Increased high-frequency antennal sweeps and vertical strokes upon odour encounter were observed, impacting olfactory environment statistics.

Conclusions:

  • Insect antennal movements, specifically sweeps, are actively involved in odour capture and transport, analogous to mammalian sniffing.
  • Antennal kinematics play a key role in generating odour intermittency, aiding navigation in low-airflow environments.
  • This study provides a model system for exploring the link between sensing and movement in animals.