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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.
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Physiology of Smell and Olfactory Pathway01:20

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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.
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Factors Affecting Perception01:25

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Visual System01:26

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Auditory Perception01:17

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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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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Olfactory Stimulation Modulates Visual Perception Without Training.

Yoshiaki Tsushima1, Yurie Nishino1, Hiroshi Ando2

  • 1National Institute of Information and Communications Technology, Center for Information and Neural Networks, Osaka, Japan.

Frontiers in Neuroscience
|August 19, 2021
PubMed
Summary
This summary is machine-generated.

Olfactory stimulation, like smells, can alter basic visual perception without training. This innate crossmodal effect influences how we see motion, suggesting a fundamental link between smell and vision.

Keywords:
crossmodal perceptionfMRImotion perceptionolfactionpsychophysics

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Crossmodal Interactions

Background:

  • Olfactory stimulation is known to influence high-level cognitive functions like emotion.
  • Limited research explores olfaction's impact on low-level sensory perception, often requiring prior perceptual training.
  • The influence of olfaction on basic sensory processing without training remains largely unexplored.

Purpose of the Study:

  • To investigate whether olfactory stimulation can modulate low-level visual perception without specific training.
  • To explore the neural mechanisms underlying olfactory-visual crossmodal interactions in basic perception.

Main Methods:

  • Conducted psychophysical experiments where participants reported the speed of moving dots under different olfactory conditions (lemon, vanilla).
  • Utilized functional magnetic resonance imaging (fMRI) to measure brain activity in visual cortices (V1, hMT) during olfactory stimulation.
  • Analyzed changes in visual perception and corresponding brain activity patterns.

Main Results:

  • Participants perceived visual motion as slower with a lemon scent and faster with a vanilla scent, demonstrating a direct perceptual modulation.
  • fMRI data revealed significant changes in brain activity within visual areas V1 and hMT correlating with the olfactory stimuli.
  • These findings indicate olfactory modulation of low-level visual perception occurs without prior training.

Conclusions:

  • Olfaction directly modulates low-level visual perception, such as motion perception, in an innate, non-learned manner.
  • This study provides the first direct evidence of an innate olfactory-visual crossmodal effect on basic perception.
  • The results necessitate a re-evaluation of the fundamental roles of olfactory function in sensory processing.