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Related Concept Videos

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...
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...
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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. This...
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...
Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.
Perception01:28

Perception

Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
Bottom-up processing begins at the sensory level, where receptors detect external environmental stimuli. These could include the tactile sensation of...

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Related Experiment Video

Updated: Jul 7, 2026

Olfactory Context Dependent Memory: Direct Presentation of Odorants
04:47

Olfactory Context Dependent Memory: Direct Presentation of Odorants

Published on: September 18, 2018

Odour perception: an object-recognition approach.

Richard J Stevenson1, Donald A Wilson

  • 1Department of Psychology, Macquarie University, Sydney, NSW 2109, Australia. richard.stevenson@psy.mq.edu.au

Perception
|February 21, 2008
PubMed
Summary
This summary is machine-generated.

Olfactory perception identifies odour objects by adapting to background smells and matching olfactory features. This object recognition model is supported by neuropsychological, learning, and developmental evidence.

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Last Updated: Jul 7, 2026

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Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing

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Area of Science:

  • Neuroscience
  • Olfactory Perception
  • Sensory Processing

Background:

  • Object recognition is vital for sensory perception, including olfaction.
  • Odours are complex mixtures but perceived as single events, posing a figure-ground segregation challenge.
  • Understanding how the brain processes complex olfactory information is crucial.

Purpose of the Study:

  • To propose a model for olfactory object recognition.
  • To explain how unitary odour perception arises from complex volatile compounds.
  • To investigate the neural mechanisms underlying odour object recognition.

Main Methods:

  • Review of neuropsychological, learning, and developmental evidence.
  • Description of neural circuitry involved in olfactory processing.
  • Discussion of object recognition principles applied to olfaction.

Main Results:

  • Central adaptation to background odours facilitates figure-ground segregation.
  • A pattern-matching system recognizes discrete spatial and temporal olfactory features as odour objects.
  • Neuropsychological, learning, and developmental data support this model.

Conclusions:

  • Olfactory object recognition relies on rapid adaptation and feature detection.
  • Memory, multimodal integration, and top-down processing are important for olfactory object recognition.
  • The proposed model provides a framework for understanding complex odour perception.