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Related Concept Videos

Synesthesia01:27

Synesthesia

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Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
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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.
The olfactory...
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Olfaction01:25

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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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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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Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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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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Chocolate smells pink and stripy: Exploring olfactory-visual synesthesia.

Alex Russell1, Richard J Stevenson, Anina N Rich

  • 1a School of Psychology , University of Sydney , Sydney , Australia.

Cognitive Neuroscience
|April 21, 2015
PubMed
Summary

Synesthesia links smells to visuals. The study found that the name of an odor, not just its smell, is key to reliably triggering consistent visual experiences in synesthetes.

Keywords:
ConceptualHedonicsMeaningOdorSynesthesia

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Science

Background:

  • Olfactory perception is complex, with odors perceived via nose or mouth (flavor).
  • Olfactory-visual synesthesia offers a model to study conceptual vs. perceptual influences on experience.
  • Understanding synesthesia aids research into sensory integration and semantic processing.

Purpose of the Study:

  • To investigate the factors influencing reliable visual imagery in olfactory-visual synesthesia.
  • To differentiate between conceptual (name, hedonics) and perceptual (odor itself) drivers of synesthetic experiences.
  • To assess the role of odor identification and attributes in generating consistent synesthetic perceptions.

Main Methods:

  • Six individuals with olfactory-visual synesthesia were presented with various odorants.
  • Participants identified smells, evaluated attributes, and illustrated their visual experiences.
  • Judges assessed the similarity of illustrations over time to determine test-retest reliability.

Main Results:

  • Synesthetic images were most similar when the same odor was consistently named.
  • Even inconsistently named odors produced more similar images than different odors, driven by hedonic similarity.
  • Odor presentation as flavor yielded similar images only when consistently named.

Conclusions:

  • Odor naming is the primary factor in generating reliable synesthetic images.
  • Odor hedonics (basic semantic knowledge) also influence synesthetic image consistency.
  • Findings support a conceptual basis for synesthetic links, emphasizing semantic processing over pure perception.