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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...
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.
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Jul 1, 2026

Simple and Computer-assisted Olfactory Testing for Mice
06:40

Simple and Computer-assisted Olfactory Testing for Mice

Published on: June 15, 2015

Olfactory discrimination: when vision matters?

M Luisa Demattè1, Daniel Sanabria, Charles Spence

  • 1Crossmodal Research Laboratory, Department of Experimental Psychology, University of Oxford, Oxford, UK. marialuisa.dematte@unitn.it

Chemical Senses
|September 17, 2008
PubMed
Summary
This summary is machine-generated.

Visual cues like color and shape automatically influence human smell perception, even when ignored. This study shows visual information impacts olfactory discrimination tasks, highlighting crossmodal interactions.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Sensory perception

Background:

  • Previous research explored visual cue effects on olfactory perception, primarily focusing on color.
  • Explanations often involved multisensory perceptual interactions, but higher-level processing interactions were less explored.
  • Semantic knowledge is known to significantly impact olfactory perception.

Purpose of the Study:

  • To investigate how visual cues (color and shape) influence human olfactory discrimination performance.
  • To determine if task-irrelevant visual stimuli affect speeded odor identification.
  • To explore the automaticity of higher-level visual-olfactory crossmodal interactions.

Main Methods:

  • Participants performed speeded odor discrimination tasks (lemon vs. strawberry).
  • Visual stimuli included color patches (red/yellow) and/or shape outlines (lemon/strawberry).
  • Participants were instructed to ignore visual stimuli during the task.

Main Results:

  • Accuracy in odor discrimination was significantly influenced by visual distractors.
  • Both color and shape information were processed and affected performance.
  • Task-irrelevant visual cues demonstrably impacted olfactory discrimination.

Conclusions:

  • Visual cues, including color and shape, are automatically integrated into olfactory perception.
  • This suggests higher-level, automatic crossmodal interactions between vision and olfaction.
  • Findings challenge purely perceptual interaction models and support semantic influences in crossmodal processing.