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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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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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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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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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The nose is composed of an observable exterior segment (external nose) and an internal segment within the skull known as the nasal cavity (internal nose). The external nose, visible on the face, consists of a framework of bone and hyaline cartilage enveloped in skin and muscle and lined with a mucous membrane. This structure is supported by the frontal bone, nasal bones, and maxillary bone and is supplemented by a cartilaginous framework comprising the septal nasal cartilage, lateral nasal...
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Updated: Apr 9, 2026

Constructing an Olfactometer for Rodent Olfactory Behavior Studies Near-Infrared Spectroscopy Hyperscanning Study in Psychological Counseling
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Olfactory Orientation and Navigation in Humans.

Lucia F Jacobs1, Jennifer Arter1, Amy Cook1

  • 1Department of Psychology, University of California, Berkeley, California, United States of America.

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|June 18, 2015
PubMed
Summary
This summary is machine-generated.

Humans can use scent to navigate and pinpoint locations, similar to how pigeons use odor maps. This study provides the first direct evidence of humans creating spatial coordinate locations based on olfactory cues.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Animal Behavior

Background:

  • Theoretical models suggest animals may use odor grids for spatial navigation.
  • Direct evidence for animals, including humans, creating coordinate locations on odor grids is lacking.

Purpose of the Study:

  • To investigate if humans can define arbitrary spatial locations using olfactory information.
  • To determine the role of olfactory stimuli in human spatial navigation compared to visual and control conditions.

Main Methods:

  • A spatial match-to-sample procedure was employed.
  • Participants were led to a random location in a room with two odors and asked to return after disorientation.
  • Three conditions were tested: olfactory stimuli only, visual stimuli only, and a control with no sensory stimuli.

Main Results:

  • Human participants demonstrated higher accuracy in locating the target in the olfaction-only condition compared to the control condition.
  • Performance in the olfactory condition was significantly above chance, indicating a reliance on scent for navigation.
  • Accuracy was not significantly higher in the visual-only condition compared to the control.

Conclusions:

  • Humans possess the ability to create a spatial map using olfactory cues, defining coordinate locations on an odor grid.
  • This olfactory-based navigation mechanism, previously theorized for species like the homing pigeon, is also utilized by humans.
  • Olfactory information plays a significant role in human spatial orientation and navigation.