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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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.
The olfactory...
Olfaction01:25

Olfaction

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...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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Related Experiment Video

Updated: Jun 23, 2026

Extracellular Multi-Unit Recording from the Olfactory Nerve of Teleosts
07:02

Extracellular Multi-Unit Recording from the Olfactory Nerve of Teleosts

Published on: October 6, 2020

Olfactory self-recognition in a cichlid fish.

Timo Thünken1, Nadine Waltschyk, Theo C M Bakker

  • 1Institute for Evolutionary Biology and Ecology, University of Bonn, An der Immenburg 1, Bonn 53121, Germany. tthuenken@evolution.uni-bonn.de

Animal Cognition
|May 23, 2009
PubMed
Summary

Cichlid fish can recognize their own scent, preferring it over unfamiliar or sibling odors. This suggests individual self-recognition in animals, even with inbreeding.

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Last Updated: Jun 23, 2026

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Area of Science:

  • Ethology
  • Animal Behavior
  • Neuroethology

Background:

  • Animal self-cognizance plays a role in social behaviors like territoriality and kin recognition.
  • Understanding self-recognition mechanisms in non-mammalian species is crucial for evolutionary insights.

Purpose of the Study:

  • To investigate olfactory self-recognition in the cichlid fish, Pelvicachromis taeniatus.
  • To determine if self-recognition is based on individual or familial cues.

Main Methods:

  • Olfactory preference tests were conducted using male P. taeniatus in a two-choice cave setup.
  • Scented water from familiar/unfamiliar males and brothers was introduced into caves.
  • Experiments included both inbred and outbred fish.

Main Results:

  • Males preferred their own odor over that of an unfamiliar male.
  • Males preferred their own odor over that of a familiar brother, indicating individual self-recognition.
  • Outbred males preferred unfamiliar male odor over familiar brother odor, potentially to avoid kin competition.

Conclusions:

  • Pelvicachromis taeniatus exhibits individual olfactory self-recognition.
  • Self-recognition abilities were not impaired by inbreeding.
  • Findings contribute to the understanding of self-cognizance in the animal kingdom.