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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.
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Physiology of Smell and Olfactory Pathway01:20

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Related Experiment Video

Updated: Jun 11, 2026

How to Create and Use Binocular Rivalry
14:34

How to Create and Use Binocular Rivalry

Published on: November 10, 2010

Olfaction modulates visual perception in binocular rivalry.

Wen Zhou1, Yi Jiang, Sheng He

  • 1Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China. zhouw@psych.ac.cn

Current Biology : CB
|July 6, 2010
PubMed
Summary
This summary is machine-generated.

Smell can influence what we see. Introducing congruent odors to competing visual images in binocular rivalry prolonged visibility, demonstrating subconscious olfactory modulation of visual perception.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Psychophysics

Background:

  • Vision is considered dominant in humans, while olfaction is often deemed vestigial.
  • Vision typically influences olfactory perception, but olfactory influence on vision is poorly understood.

Purpose of the Study:

  • To investigate if olfaction can modulate visual perception.
  • To explore the effect of odors on binocular rivalry.

Main Methods:

  • Introducing odors congruent to competing visual stimuli during binocular rivalry.
  • Measuring changes in the visibility and suppression time of images.

Main Results:

  • Congruent odors prolonged the visibility of associated images.
  • Odors shortened the suppression time of competing images.
  • This modulation occurred automatically and subconsciously.

Conclusions:

  • Olfaction can bias visual perception.
  • Olfactory cues modulate the dynamic process of binocular rivalry.
  • This provides the first direct evidence for olfactory modulation of visual perception.