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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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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.
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Olfactory Function, Genetic Predisposition, and Cognitive Performance in Chinese Adults.

Xianyi Yang1, Jing Si1, Shuchun Lin1

  • 1Human Phenome Institute, School of Life Sciences, Fudan University, Shanghai,China.

Current Alzheimer Research
|December 24, 2021
PubMed
Summary

Reduced sense of smell is linked to cognitive decline in adults, particularly those with a higher genetic risk for Alzheimer's disease (AD). This highlights the interplay between olfaction, genetics, and brain health.

Keywords:
Alzheimer’s diseaseOlfactory functionageing.cognitive performancegenetic riskpopulation study

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Area of Science:

  • Neuroscience
  • Gerontology
  • Genetics

Background:

  • Cognitive impairment is a growing concern in aging populations.
  • Alzheimer's disease (AD) poses a significant challenge, with genetic predisposition playing a key role.
  • Olfactory dysfunction is increasingly recognized as a potential early indicator of neurological conditions.

Purpose of the Study:

  • To investigate the association between olfactory function, genetic risk for Alzheimer's disease (AD), and cognitive performance in Chinese adults.
  • To determine if genetic predisposition modifies the relationship between smell identification and cognitive status.

Main Methods:

  • A study involving 2049 Chinese adults from two cohorts (RuLAS and CCC) with varying mean ages.
  • Assessment of olfactory identification using the brief Chinese Smell Identification Test.
  • Measurement of cognitive performance via the Chinese Mini-Mental State Examination and calculation of a genetic risk score (GRS) based on 5 single nucleotide polymorphisms.

Main Results:

  • Lower olfactory function was significantly associated with higher odds of cognitive impairment (OR=1.45).
  • This association was significantly stronger in individuals with a higher genetic risk score for AD (Pinteraction=0.01).
  • Consistent findings were observed across both the RuLAS and CCC cohorts.

Conclusions:

  • Decreased olfactory function is linked to poorer cognitive performance in adults.
  • The detrimental effect of impaired olfaction on cognition is amplified in individuals with a higher genetic predisposition to Alzheimer's disease.
  • Further research is needed to elucidate the causal mechanisms underlying the olfaction-cognition relationship.