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Related Concept Videos

Olfaction01:25

Olfaction

50.1K
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...
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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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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.
The olfactory...
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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Associative Learning01:27

Associative Learning

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Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
Classical conditioning, also known...
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Related Experiment Video

Updated: Apr 16, 2026

Appetitive Associative Olfactory Learning in Drosophila Larvae
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Appetitive Associative Olfactory Learning in Drosophila Larvae

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Olfactory learning.

Ronald L Davis1

  • 1Department of Molecular and Cellular Biology, Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston, TX 77030, USA. rdavis@bcm.tmc.edu

Neuron
|September 29, 2004
PubMed
Summary
This summary is machine-generated.

Olfactory learning mechanisms are shared across species, involving distributed neural networks. Conditioning strengthens odor responses in olfactory neurons and the amygdala, revealing key molecular players.

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Comparative Biology

Background:

  • Insect and mammal olfactory systems share similarities, hinting at conserved olfactory learning mechanisms.
  • Neural substrates of olfactory memory are distributed across multiple neurons.
  • Olfactory learning involves plasticity in olfactory receptive fields and neural population activity.

Purpose of the Study:

  • To explore shared mechanisms of olfactory learning in insects and mammals.
  • To identify neural correlates of olfactory memory and conditioning.
  • To investigate molecular underpinnings of olfactory learning.

Main Methods:

  • Analysis of neural activity in olfactory pathways during learning tasks.
  • Electrophysiological recordings in second and third-order olfactory neurons.
  • Molecular genetic studies in Drosophila melanogaster.
  • Investigation of basolateral amygdala neuronal responses to conditioned odors.

Main Results:

  • Olfactory learning modifies odorant receptive fields and increases neural population coherency.
  • Operant and classical olfactory conditioning enhance neuronal responsiveness and synaptic activity.
  • Conditioned odor responses are observed in the basolateral amygdala.
  • Drosophila studies identified critical molecules in third-order olfactory neurons for learning.

Conclusions:

  • Shared neural principles likely govern olfactory learning in diverse species.
  • Neural plasticity in olfactory pathways and the amygdala are key to olfactory memory formation.
  • Molecular genetic approaches in Drosophila provide insights into conserved olfactory learning pathways.