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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

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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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Tactile and Chemical Senses01:27

Tactile and Chemical Senses

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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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Non-Verbal Cues01:29

Non-Verbal Cues

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Non-verbal communication extends beyond gestures and facial expressions to include vocal elements known as paralanguage. Paralanguage consists of non-verbal vocal cues such as pitch, loudness, speech rate, pauses, and non-verbal vocalizations like laughter, sighs, and moans. These elements not only accompany speech but also provide critical emotional and contextual information.The Role of Paralanguage in CommunicationParalanguage adds depth to spoken language by conveying emotions and...
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Introduction to Special Senses01:26

Introduction to Special Senses

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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...
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Related Experiment Video

Updated: Mar 8, 2026

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

Olfactory Context Dependent Memory: Direct Presentation of Odorants

Published on: September 18, 2018

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Olfactory notes in the mind space: A registered report.

Michelle Caldana1, Elena Rusconi1

  • 1Department of Psychology and Cognitive Science, University of Trento, Italy.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 6, 2026
PubMed
Summary

This study investigated if odors create mental spatial representations. While not conclusive at the group level, exploratory analysis suggests some individuals associate scents with vertical space, warranting further research.

Keywords:
Crossmodal correspondenceMental representationOlfactionSpaceStimulus-response compatibility

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A Free-breathing fMRI Method to Study Human Olfactory Function
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A Free-breathing fMRI Method to Study Human Olfactory Function
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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Perception

Background:

  • Olfaction is a fundamental sense with incompletely understood central mechanisms.
  • Olfactory perception is not typically linked to spatial representation, unlike other senses.
  • The fragrance industry uses vertical descriptors (top/base notes) and olfactory pyramids, suggesting potential spatial associations.

Purpose of the Study:

  • To determine if olfactory stimuli evoke a mental vertical spatial representation in individuals without explicit elevation cues.
  • To investigate the potential dimensional overlap between odor quality and spatial representation through a stimulus-response compatibility task.

Main Methods:

  • A speeded choice classification task involving 110 participants classifying fruity or gourmand odors.
  • Participants responded by pressing one of two vertically aligned buttons.
  • Analysis focused on spatial stimulus-response compatibility (SRC) effects.

Main Results:

  • Group-level analysis of median correct responses did not confirm a significant vertical SRC effect for odors.
  • Exploratory analyses suggested the presence of the effect, but Bayesian analysis yielded inconclusive results.
  • Further exploratory analysis identified three participant clusters: two showing the predicted effect and one showing an opposite effect.

Conclusions:

  • The study did not conclusively establish a group-level vertical spatial representation linked to odor quality.
  • Individual differences in spatial stimulus-response compatibility for odors were observed, suggesting potential variations in olfactory-spatial mapping.
  • Replication studies are recommended to explore sources of individual variability in olfactory-spatial representation.