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Cognitive factors in odor detection, odor discrimination, and odor identification tasks
Stockholm University, Faculty of Social Sciences, Department of Psychology, Perception and psychophysics.
Stockholm University, Faculty of Social Sciences, Department of Psychology, Perception and psychophysics.
Department of Otorhinolaryngology, University of Dresden Medical School, Dresden, Germany.
University of Padova, Padova, Italy.
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2010 (English)In: Journal of Clinical and Experimental Neuropsychology, ISSN 1380-3395, E-ISSN 1744-411X, Vol. 32, no 10, 1062-1067 p.Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to determine cognitive correlates of olfactory performance across three different tasks. A total of 170 men and women (30-87 years of age) were assessed in olfactory sensitivity, discrimination, and identification. Also, participants were tested in a range of cognitive tests covering executive functioning, semantic memory, and episodic memory. Hierarchical regression analyses showed that proficiency in executive functioning and semantic memory contributed significantly to odor discrimination and identification performance, whereas all of the cognitive factors proved unrelated to performance in the odor threshold test. This pattern of outcome suggests that an individual's cognitive profile exerts a reliable influence on performance in higher order olfactory tasks.

Place, publisher, year, edition, pages
2010. Vol. 32, no 10, 1062-1067 p.
Keyword [en]
olfaction, smell, cognition, memory, age
National Category
Psychology
Research subject
Psychology
Identifiers
URN: urn:nbn:se:su:diva-53399DOI: 10.1080/13803391003683070ISI: 000285150000003OAI: oai:DiVA.org:su-53399DiVA: diva2:390642
Note

AuthorCount: 5;

Available from: 2011-01-22 Created: 2011-01-22 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Olfactory Function: The Influence of Demographic, Cognitive, and Genetic Factors
Open this publication in new window or tab >>Olfactory Function: The Influence of Demographic, Cognitive, and Genetic Factors
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Olfactory function is affected by demographic, cognitive, and genetic factors. In the present thesis, three empirical studies investigated individual differences in olfactory ability. Study I explored demographic and cognitive correlates in common olfactory tasks; odor detection, odor discrimination, and odor identification. The results indicated that old age influenced performance negatively in all tasks, and that semantic memory proficiency and executive functioning were related to odor discrimination and odor identification performance. No cognitive influence was observed for measurements of olfactory threshold. Using population-based data, Study II investigated a potential influence of the ApoE gene on olfactory identification after controlling for health status, semantic memory, and preclinical and clinical dementia. The main finding was that the ApoE- ɛ4 allele interacted with age, such that older ɛ4-carriers had an impaired odor identification performance relative to older non-carriers. Importantly, the negative ApoE- ɛ4 effect on olfactory proficiency was independent of clinical dementia conversion within five years. Study III investigated the effects of the BDNF val66met polymorphism on olfactory change over a five-year interval, in a community dwelling sample of young and old age cohorts. The results showed that age-related decline in olfactory identification was influenced by the BDNF val66met. In middle-aged subjects, no effect of BDNF val66met was observed although older val homozygote carriers showed a selectively larger olfactory decline than the older met carriers. Overall, results suggest that the relative influence of demographic and cognitive factors vary across different olfactory tasks and that two genes (ApoE and BDNF) impact age-related deficits in odor identification. Potential theoretical and practical implications of the findings are discussed as well as potential limitations of association studies in genomics research.

Place, publisher, year, edition, pages
Stockholm: Department of Psychology, Stockholm University, 2013. 80 p.
Keyword
Olfaction, odor identification, odor threshold, odor discrimination, aging, gender, ApoE, BDNF, val66met, association study, population-based
National Category
Psychology (excluding Applied Psychology)
Research subject
Psychology
Identifiers
urn:nbn:se:su:diva-85907 (URN)978-91-7447-628-6 (ISBN)
Public defence
2013-02-15, David Magnussonsalen (U31), hus 8, Frescati Hagväg 8, Stockholm, 10:00 (English)
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Available from: 2013-01-24 Created: 2013-01-10 Last updated: 2013-01-24Bibliographically approved

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