1 Center for Advanced Research in Sleep Medicine, Sacré-Coeur Hospital of Montreal, Montréal, Canada.
2 Department of Anatomy, Université du Québec à Trois-Rivières, 3351, boul. des Forges, Trois-Rivières, Québec G9A 5H7, Canada.
3 Faculty of Medicine, Université de Montréal, Montréal, Canada.
4 Department of Psychology, Université de Montréal, Montréal, Canada.
5 Perform Center, Concordia University, Montréal, Canada.
6 Faculty of Health Sciences, University of Ottawa, Ottawa, Canada.

The Effect of Stimulus Duration on the Nostril Localization of Eucalyptol.

Chem Senses. 2017 05 01;42(4):303-308

Authors: Frasnelli J, Gingras-Lessard F, Robert J, Steffener J

Abstract

The trigeminal system is a chemosensory system participating in the perception of most odorants, which allows for the perception of diverse sensations including the freshness of eucalyptus or the spiciness of pepper. The lateralization task, that is, the identification of the stimulated nostril in a monorhinal stimulation paradigm is only possible following trigeminal stimulation and allows therefore for the assessment of the trigeminal sensitivity also in a clinical setting. In this study, we aimed to determine the effects of the duration of stimuli on the lateralization task. To this end, we asked 32 young and healthy subjects perform the lateralization task while being exposed to eucalyptol stimuli ranging between 100 and 1250 ms. We found that participants performed on average at chance for stimuli shorter than 500 ms, and observed increasing accuracy for stimuli with longer durations. In conclusion, these data suggest that 500 ms represents a threshold for the lateralization of eucalyptol stimuli. Therefore, when trigeminal sensitivity is tested in a clinical setting, eucalyptol stimuli should have a duration of at least 500 ms.

PMID: 28334125 [PubMed - indexed for MEDLINE]