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Olfactory functioning and cognitive abilities: a twin study.

D Finkel1, N L Pedersen, M Larsson

  • 1School of Social Sciences, Indiana University Southeast, New Albany, 47150, USA. dfinkel@ius.edu

The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
|July 11, 2001
PubMed
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Genetic factors influence how well people identify smells and perceive their intensity. Odor identification and verbal ability share a common genetic basis, suggesting they involve similar cognitive processes.

Area of Science:

  • Behavioral Genetics
  • Neuroscience
  • Psychology

Background:

  • Olfactory functioning is crucial for daily life.
  • Understanding the genetic underpinnings of sensory perception is important.
  • Previous research suggests links between cognition and olfaction.

Purpose of the Study:

  • To investigate the heritability of olfactory functioning in aging adults.
  • To explore the genetic relationship between odor identification and verbal ability.

Main Methods:

  • Utilized a Swedish version of the National Geographic Smell Survey.
  • Conducted quantitative genetic analysis on 227 twin pairs (Swedish Adoption/Twin Study of Aging).
  • Assessed four measures of olfactory functioning (odor identification, intensity, detection, pleasantness).

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Main Results:

  • Moderate heritability was found for odor identification and perceived intensity.
  • Heritability for odor detection and perceived pleasantness was not significant.
  • Bivariate analyses indicated a primarily genetic link between odor identification and verbal ability.

Conclusions:

  • Olfactory abilities, particularly odor identification, have a significant genetic component.
  • Odor identification and verbal ability likely share underlying genetic influences and cognitive domains.
  • These findings contribute to understanding the genetic architecture of sensory and cognitive functions in aging.