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Related Concept Videos

Olfaction01:25

Olfaction

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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.
The olfactory receptors are embedded in the cilia of the...
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Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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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Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Related Experiment Video

Updated: Mar 24, 2026

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling

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Multidimensional representation of odors in the human olfactory cortex.

A Fournel1, C Ferdenzi1, C Sezille1

  • 1Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, University Lyon, F-69000, France.

Human Brain Mapping
|March 19, 2016
PubMed
Summary

The human brain processes odor information by linking chemical properties to anterior piriform cortex (PC) activity, olfactory perceptions to posterior PC activity, and trigeminal sensations to amygdala activity.

Keywords:
amygdalamental representationpiriformsimilaritysmelltrigeminal

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Area of Science:

  • Neuroscience
  • Olfactory research
  • Sensory perception

Background:

  • Odor perception is a complex process integrating physical and perceptual attributes via olfactory and trigeminal systems.
  • Understanding how the brain organizes these multidimensional odor representations is crucial for olfactory neuroscience.

Purpose of the Study:

  • To investigate the neural organization of odor representation by analyzing similarities in physical, olfactory, and trigeminal perceptual spaces.
  • To decipher how the human brain processes and integrates diverse odor features.

Main Methods:

  • Combined psychophysics, functional magnetic resonance imaging (fMRI), and multivariate representational similarity analysis.
  • Participants rated odors on olfactory (pleasantness, intensity, familiarity, edibility) and trigeminal (irritation, coolness, warmth, pain) dimensions.
  • Event-related fMRI design presented various odorants to capture neural responses.

Main Results:

  • Anterior piriform cortex (PC) activity similarities correlated with chemical property similarities (P < 0.005).
  • Posterior PC activity similarities correlated with olfactory perceptual similarities (P < 0.01).
  • Amygdala activity similarities correlated with trigeminal perceptual similarities (P < 0.01).

Conclusions:

  • Neural processing of physical, olfactory, and trigeminal features of odors occurs in a distributed manner within the olfactory system.
  • Specific brain regions, including the piriform cortex and amygdala, are involved in processing distinct aspects of odor information.
  • This study provides evidence for a brain mechanism that extracts and represents similarities between odorous stimuli based on their physical and perceptual characteristics.