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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Olfaction01:25

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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.
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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Synergistic olfactory processing for social plasticity in desert locusts.

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Desert locusts change from solitary to swarming behavior when crowded. This study reveals how olfactory social cues enhance food detection in swarming locusts, improving food security strategies.

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Area of Science:

  • Entomology
  • Neuroscience
  • Behavioral Ecology

Background:

  • Desert locust plagues pose significant threats to global food security.
  • Locusts exhibit phenotypic plasticity, transitioning from solitary to gregarious (swarming) phases due to crowding.
  • This phase transition impacts their foraging behavior and neural processing.

Purpose of the Study:

  • To investigate how the transition to gregarious behavior affects locust foraging decisions and neural circuits.
  • To identify the role of olfactory cues in mediating foraging behavior during different locust phases.
  • To understand the neural mechanisms underlying enhanced food detection in swarming locusts.

Main Methods:

  • Behavioral experiments and Bayesian modeling were employed to analyze foraging decisions.
  • In-vivo calcium imaging was used to study olfactory responses in the locust nervous system.
  • Analysis focused on odor encoding and interactions between food-related and social cues.

Main Results:

  • Olfactory social cues are critical drivers of foraging decisions in locusts.
  • Crowding induces synergistic interactions between food and social odors in the olfactory system.
  • These synergistic effects are specific to the gregarious phase, manifesting in unique odor response patterns.
  • The locust olfactory system shows crowding-induced modulation enhancing food detection in swarms.

Conclusions:

  • The study elucidates the link between sensory adaptations and behaviorally relevant tasks in locusts.
  • Findings suggest that olfactory system modulation enhances food detection for swarming locusts.
  • This research improves understanding of social modulation in non-model organisms and informs locust plague management.