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Related Concept Videos

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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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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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Multimodal learning of pheromone locations.

Meenakshi Pardasani1, Shruti D Marathe1, Maitreyee Mandar Purnapatre1,2

  • 1Laboratory of Neural Circuits and Behaviour (LNCB), Department of Biology, Indian Institute of Science Education and Research (IISER), Pune, India.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|August 18, 2021
PubMed
Summary

Female mice form long-term memories of pheromone locations by integrating olfactory and somatosensory whisker information. Blocking whisker input prevents this memory, highlighting the crucial role of multimodal sensory integration in social behavior.

Keywords:
non-pheromonal volatiles discriminationolfactory bulbpheromone location preferencesomatosensory cortex

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Animal Behavior

Background:

  • Pheromone location memory is vital for mammalian reproduction and competition.
  • Rodents process pheromones via main and accessory olfactory systems.
  • The role of somatosensation in pheromone memory remains unclear.

Purpose of the Study:

  • To investigate the role of somatosensation in learning and memorizing pheromone locations.
  • To explore the integration of olfactory and somatosensory systems in female mice.
  • To establish a novel assay for multimodal pheromone location learning.

Main Methods:

  • Female mice were trained in a task involving olfactory (male urine) and somatosensory (vibrissae sensing orifice shape) cues.
  • Memory retention was tested 15 days later.
  • Somatosensory input was blocked using whisker pad anesthesia, and pheromonal cues were altered (same-sex urine).
  • Expression of activity-regulated cytoskeleton protein was measured.

Main Results:

  • Female mice successfully memorized opposite-sex pheromone locations after multimodal training.
  • Memory formation failed when somatosensory input was blocked or pheromones were from the same sex.
  • Enhanced activity-regulated cytoskeleton protein expression confirmed olfactory-somatosensory association.
  • Main olfactory bulb activation by pheromones did not affect non-pheromone learning.

Conclusions:

  • Somatosensory input via vibrissae is essential for long-term memory of pheromone locations in female mice.
  • Multimodal sensory integration, specifically olfactory and somatosensory pathways, is critical for social and reproductive behavior memory.
  • This study reveals a novel mechanism for associative learning between distinct sensory modalities.