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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.
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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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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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Sensory Perception: Organization of the Somatosensory System01:11

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
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Introduction to Special Senses01:26

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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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Tactile and Chemical Senses01:27

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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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Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing
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Quality-space theory in olfaction.

Benjamin D Young1, Andreas Keller2, David Rosenthal3

  • 1The Department of Cognitive and Brain Science, Ben-Gurion University of the Negev Beer-Sheva, Israel.

Frontiers in Psychology
|January 30, 2014
PubMed
Summary
This summary is machine-generated.

Quality-space theory (QST) explains mental qualities in perception. This study applies QST to olfaction, demonstrating its utility for understanding complex olfactory experiences and abilities.

Keywords:
consciousnessmental qualitiesolfactionperceptual qualitiesphenomenologyquality-spacequality-space theory

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Area of Science:

  • Philosophy of Mind
  • Sensory Perception
  • Cognitive Science

Background:

  • Quality-space theory (QST) typically focuses on visual color perception.
  • Olfaction presents unique complexities compared to vision.
  • A robust theory of mental qualities should extend beyond visual modalities.

Purpose of the Study:

  • To apply Quality-space theory (QST) to the domain of olfaction.
  • To construct an olfactory quality space (QS) based on perceptible properties.
  • To define olfactory mental qualities within this framework and test QST's applicability.

Main Methods:

  • Constructing a quality space (QS) based on olfactory perceptible properties.
  • Defining olfactory mental qualities by their role within the olfactory QS.
  • Examining the delimitation of the olfactory QS from other sensory modalities.
  • Applying QST to experience-dependent refinement of olfactory abilities and non-conscious olfactory states.

Main Results:

  • A quality space (QS) for olfaction can be successfully constructed.
  • Olfactory mental qualities can be defined and understood using QST.
  • QST effectively addresses the complexities of olfactory perception.
  • The theory accommodates the role of experience and non-conscious states in olfaction.

Conclusions:

  • Quality-space theory (QST) is fully applicable to the complex domain of olfaction.
  • QST provides a valuable framework for understanding olfactory mental qualities and perception.
  • The study validates QST's extensibility to diverse sensory modalities.