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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: May 22, 2026

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits
12:13

Multi-unit Recording Methods to Characterize Neural Activity in the Locust (Schistocerca Americana) Olfactory Circuits

Published on: January 25, 2013

Antennal lobe processing correlates to moth olfactory behavior.

Linda S Kuebler1, Marco Schubert, Zsolt Kárpáti

  • 1Department of Evolutionary Neuroethology, Max-Planck-Institute for Chemical Ecology, 07745 Jena, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 28, 2012
PubMed
Summary
This summary is machine-generated.

Insect olfactory processing in the antennal lobe (AL) transforms odor mixtures. While input is linear, output shows unique nonlinear patterns, with specific odor modulations linked to accelerated behavioral responses.

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Last Updated: May 22, 2026

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Electrophysiological Measurements from a Moth Olfactory System
06:16

Electrophysiological Measurements from a Moth Olfactory System

Published on: March 29, 2011

Area of Science:

  • Neuroscience
  • Olfactory system research
  • Insect behavior

Background:

  • Animals process complex olfactory environments using the antennal lobe (AL) for initial odor reception.
  • In insects, olfactory sensory neurons (OSNs) transmit signals to the AL, where local interneurons (LNs) modulate input before projection neurons (PNs) relay it to higher brain centers.

Purpose of the Study:

  • To investigate how the moth antennal lobe (AL) processes complex odor mixtures compared to individual components.
  • To determine if signal modulation within the AL correlates with behavioral relevance.

Main Methods:

  • Optophysiological studies were conducted in the Manduca sexta moth's AL.
  • Odor-evoked calcium changes were recorded in response to monomolecular host volatiles and their artificial mixture.
  • A double staining approach simultaneously measured olfactory sensory neuron (OSN) input and projection neuron (PN) output.

Main Results:

  • Odor mixtures were generally predictable from linear summation at the AL input.
  • Output neurons generated unique, nonlinear spatial patterns distinct from individual component identities.
  • Phenyl acetaldehyde, a mixture component, induced significant nonlinear input-output modulation and accelerated behavioral activity.

Conclusions:

  • The antennal lobe (AL) transforms linear odor mixture input into nonlinear spatial output patterns.
  • High levels of input-output modulation in the AL for specific odors correlate with behavioral output and relevance.