Development of a smell identification test using a novel stick-type odor presentation kit

Area of Science:

• Olfactory science
• Sensory perception research
• Psychophysics of smell

Background:

• Odor identification is significantly influenced by social and cultural factors, necessitating culturally relevant odorants for accurate testing.
• Existing smell identification tests often lack user-friendly devices that maintain odor quality over time.

Purpose of the Study:

• To develop a novel, user-friendly stick-type odor presentation kit.
• To create an effective smell identification test utilizing culturally familiar odorants.
• To validate the performance and reliability of the developed odor kit and testing method.

Main Methods:

• Development of a stick-type odor presentation kit with microencapsulated odorants in a stable cream base.
• Selection of 13 odorants familiar to the target Japanese population.
• Implementation of two odor identification methods: a modified forced-choice paradigm and a two-step category-then-name selection paradigm.
• Validation through stability testing, test-retest reliability, comparison with an existing smell test, and assessment across various age groups.

Main Results:

• The novel odor stick kit demonstrated stability and effective odor retention.
• The smell identification test using the kit showed reliable performance in test-retest assessments.
• The test proved effective in identifying odors among Japanese participants of different age ranges.
• Comparison with another smell test indicated the efficacy of the new method.

Conclusions:

• The developed stick-type odor presentation kit is a practical and effective device for delivering odors.
• The associated smell identification test is a valid and reliable tool for assessing olfactory identification.
• The use of culturally familiar odorants enhances the accuracy and relevance of smell identification tests.