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Perception of phasic pain is modulated by smell and taste
Author(s) -
Riello Marianna,
Cecchini Maria Paola,
Zanini Alice,
Di Chiappari Miguel,
Tinazzi Michele,
Fiorio Mirta
Publication year - 2019
Publication title -
european journal of pain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.305
H-Index - 109
eISSN - 1532-2149
pISSN - 1090-3801
DOI - 10.1002/ejp.1453
Subject(s) - pain tolerance , psychology , perception , taste , threshold of pain , sensory system , audiology , detection threshold , valence (chemistry) , neuropathic pain , cognition , anesthesia , medicine , neuroscience , chemistry , organic chemistry , real time computing , computer science
Background Pain perception is a multimodal experience composed of sensory, emotional and cognitive dimensions. Accumulating evidence suggests that the chemical senses can influence pain perception, but their relation with phasic pain is still unknown. The aim of this study was to investigate the influence of smell and taste having different valence on phasic pain. Methods Twenty‐eight healthy volunteers received sweet, bitter and neutral odours or gustatory substances while receiving painful stimuli consisting of electrical shocks. Tactile threshold, pain threshold and pain tolerance were collected using the psychophysical method of limits at baseline and in association with smell and taste. Perception of pain intensity and unpleasantness was measured with a numerical rating scale. Results Sweet smell induced lower ratings of pain intensity than bitter smell when stimuli were delivered at pain threshold. Sweet smell also induced lower ratings of pain unpleasantness than neutral smell when stimuli were delivered at pain tolerance. Sweet taste induced lower ratings of pain unpleasantness than bitter taste when stimuli were delivered at pain threshold. Conversely, pain threshold and pain tolerance per se were not affected by smell and taste. Conclusions These findings highlight an effect of sweet substances in reducing the subjective perception of pain intensity and unpleasantness associated to phasic pain. Significance By demonstrating the link between smell, taste and phasic pain this study may have a translational impact in clinical conditions characterized by so‐called shock‐like pain, such as neuropathic pain.