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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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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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A Free-breathing fMRI Method to Study Human Olfactory Function
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Association between cognitive function and olfactory identification ability in community-dwelling older individuals.

Masashi Yoshitake1,2, Etsuko Maeshima2, Shinichiro Maeshima1

  • 1Faculty of Health Sciences, Kinjo University: 1200 Kasama-machi, Hakusan-shi, Ishikawa 924-8511, Japan.

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Summary

Olfactory identification ability may help detect early cognitive decline in older adults. A study found a link between smell tests and cognitive function scores, suggesting a new screening tool.

Keywords:
Alzheimer’s diseaseCognitive dysfunctionDementia

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Area of Science:

  • Neuroscience
  • Gerontology
  • Olfactory Research

Background:

  • Early detection of cognitive decline is crucial for timely intervention.
  • Olfactory dysfunction is increasingly recognized as a potential early marker for neurodegenerative diseases.
  • Existing cognitive screening tools may not capture subtle, early-stage changes.

Purpose of the Study:

  • To determine if olfactory identification ability can serve as an early indicator of cognitive decline.
  • To investigate the association between olfactory function and cognitive performance in community-dwelling older adults.

Main Methods:

  • 55 community-dwelling older adults without prior cognitive impairment were assessed.
  • Cognitive function was evaluated using the Japanese versions of the Mini-Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA).
  • Olfactory identification ability was measured using the Odor Stick Identification Test for the Japanese (OSIT-J).

Main Results:

  • 21 participants showed cognitive decline based on MoCA scores.
  • A significant difference in olfactory identification ability was found between participants with and without cognitive decline (MoCA-based).
  • A significant positive correlation was observed between MoCA scores and OSIT-J scores, but not between MMSE and OSIT-J scores.

Conclusions:

  • Olfactory identification ability, particularly as measured by the OSIT-J, shows promise for detecting early cognitive decline.
  • Smell identification tests may offer a valuable, non-invasive method for screening cognitive impairment in older populations.
  • Further research is warranted to validate olfactory tests as routine screening tools for cognitive health.