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Related Concept Videos

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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Physiology of Smell and Olfactory Pathway01:20

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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 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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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Long-Term Memory01:18

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Long-term memory is a relatively permanent type of memory, capable of storing vast amounts of information over extended periods. Its storage capacity is generally considered unlimited.
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Long-Term Olfactory Memory in African Elephants.

Franziska Hoerner1, Arne Lawrenz2, Ann-Kathrin Oerke3

  • 1Department of Zoology, University of Wuppertal, 42119 Wuppertal, Germany.

Animals : an Open Access Journal From MDPI
|February 25, 2023
PubMed
Summary

African elephants possess remarkable olfactory memory, distinguishing kin from non-kin by scent even after years of separation. This research highlights the crucial role of smell in maintaining elephant family bonds.

Keywords:
Loxodonta africanahuman carelong-term memoryscent memory

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Area of Science:

  • Ethology
  • Olfactory Biology
  • Animal Behavior

Background:

  • African elephants have a highly developed sense of smell, with the largest repertoire of olfactory receptor genes.
  • Olfaction is vital for social interactions and family bonding in elephants.
  • Long-term olfactory memory in elephants has not been empirically studied.

Purpose of the Study:

  • To investigate the long-term olfactory memory capabilities of African elephants.
  • To determine if elephants can differentiate between kin and non-kin by scent after extended periods.
  • To understand the role of scent in maintaining social bonds in African elephants.

Main Methods:

  • An ethological experiment was conducted with two mother-daughter elephant pairs.
  • Elephants were presented with feces from absent kin, absent non-kin, and present non-kin.
  • Reactions were recorded via video to analyze scent recognition and social responses.

Main Results:

  • Elephants showed significant recognition responses to feces of absent kin after long-term separation.
  • Reactions to feces of absent non-kin and present non-kin were minimal.
  • The study implies olfactory memory in elephants can last from over 1 year up to 12 years.

Conclusions:

  • African elephants demonstrate a long-term olfactory memory, extending beyond 12 years.
  • Elephants can reliably distinguish between kin and non-kin based solely on scent.
  • Scent plays a critical role in the enduring family bonds observed in African elephants.