Abstract
Olfaction, taste and trigeminal function are three distinct modalities. However, in daily life they are often activated concomitantly. In health and disease, it has been shown that in two of these senses, the trigeminal and olfactory senses, modification of one sense leads to changes in the other sense and vice versa. The objective of the study was to investigate whether and (if so) how, the third modality, taste, is influenced by olfactory impairment. We tested 210 subjects with normal (n = 107) or impaired (n = 103) olfactory function for their taste identification capacities. Validated tests were used for olfactory and gustatory testing (Sniffin’ Sticks, Taste Strips). In an additional experiment, healthy volunteers underwent reversible olfactory cleft obstruction to investigate short-time changes of gustatory function after olfactory alteration. Mean gustatory identification (taste strip score) for the subjects with impaired olfaction was 19.4 ± 0.6 points and 22.9 ± 0.5 points for those with normal olfactory function (t = 4.6, p < 0.001). The frequencies of both, smell and taste impairments interacted significantly (Chi2, F = 16.4, p < 0.001), and olfactory and gustatory function correlated (r 210 = 0.30, p < 0.001). Neither age nor olfactory impairment cause effects interfered with this olfactory–gustatory interaction. In contrast, after short-lasting induced olfactory decrease, gustatory function remained unchanged. The present study suggests that longstanding impaired olfactory function is associated with decreased gustatory function. These findings seem to extend previously described mutual chemosensory interactions also to smell and taste. It further raises the question whether chemical senses in general decrease mutually after acquired damage.
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Acknowledgments
We would like to thank Gerd Kobal, Stefan Kallert and Christian Mueller for their helpful advice concerning production and use of the “Taste Strips”. The study was supported by a Grant of the Swiss National Fund for Scientific Research [SSMBS grant no. PASMA-119579/1] to BNL. Parts of this work have been published previously as Abstract (see Hummel et al., Chemical Senses 2001, 26, 1118).
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Landis, B.N., Scheibe, M., Weber, C. et al. Chemosensory interaction: acquired olfactory impairment is associated with decreased taste function. J Neurol 257, 1303–1308 (2010). https://doi.org/10.1007/s00415-010-5513-8
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DOI: https://doi.org/10.1007/s00415-010-5513-8