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PubMedDate not supplied

[The effect of age on the sense of smell in health individuals].

INTRODUCTION: A need for research of the olfactory function exists in everyday clinical work. The aim of this study was to determine standards for perception and identification thresholds regarding olfactory substances in healthy subjects in regard to their age. MATERIAL AND METHODS: The research included 120 healthy examinees (60 women and 60 men) classified according to age into three age groups (20-30, 31-40, 41-50 years of age). This examination was done using Fortunato-Niccolini's method. RESULTS AND DISCUSSION: The results of this work show that olfactory function becomes significantly weaker after the age of forty. Thresholds of perception in correlation with thresholds of identification for examined olfactory substances are significantly lower in older age groups. CONCLUSION: A gradual loss of olfactory capability with age can be explained by gradual destruction of olfactory cells and fibres of olfactory nerves during life.

Adult↗
PubMed1994

Sex differences in olfactory sensitivity and the problem of the generality of smell acuity.

Sex differences in olfactory sensitivity are not an invariably recurring phenomenon. In the present study some factors, possibly involved in inconsistent findings, are investigated. Sensitivity to 5 different odorants was assessed in 112 subjects on 4 different occasions. Sex differences emerged for some odors but not for others, and some explanations for this state of affairs were suggested. There was no effect of the personality dimension of extraversion-introversion. Low correlations among the 5 measures of detectability question the existence of a general factor of sensitivity.

Adult↗
PubMed2006

Smell your way back to childhood: autobiographical odor memory.

This study addressed age distributions and experiential qualities of autobiographical memories evoked by different sensory cues. Ninety-three older adults were presented with one of three cue types (word, picture, or odor) and were asked to relate any autobiographical event for the given cue. The main aims were to explore whether (1) the age distribution of olfactory-evoked memories differs from memories cued by words and pictures and (2) the experiential qualities of the evoked memories vary over the different cues. The results showed that autobiographical memories triggered by olfactory information were older than memories associated with verbal and visual information. Specifically, most odor-cued memories were located to the first decade of life (<10 years), whereas memories associated with verbal and visual cues peaked in early adulthood (11-20 years). Also, odor-evoked memories were associated with stronger feelings of being brought back in time and had been thought of less often than memories evoked by verbal and visual information. This pattern of findings suggests that odor-evoked memories may be different from other memory experiences.

Age Factors↗
PubMed2001

Fast and accurate measurement of taste and smell thresholds using a maximum-likelihood adaptive staircase procedure.

This paper evaluates the use of a maximum-likelihood adaptive staircase psychophysical procedure (ML-PEST), originally developed in vision and audition, for measuring detection thresholds in gustation and olfaction. The basis for the psychophysical measurement of thresholds with the ML-PEST procedure is developed. Then, two experiments and four simulations are reported. In the first experiment, ML-PEST was compared with the Wetherill and Levitt up-down staircase method and with the Cain ascending method of limits in the measurement of butyl alcohol thresholds. The four Monte Carlo simulations compared the three psychophysical procedures. In the second experiment, the test-retest reliability of MLPEST for measuring NaCl and butyl alcohol thresholds was assessed. The results indicate that the ML-PEST method gives reliable and precise threshold measurements. Its ability to detect malingerers shows considerable promise. It is recommended for use in clinical testing.

Adolescent↗