Abstract
There is overlap between brain regions involved in taste and pain perception, and cortical injuries may lead to increases as well as decreases in sensitivity to taste. Recently it was shown that chronic back pain (CBP) is associated with a specific pattern of brain atrophy. Since CBP is characterized by increased sensitivity to pain, we reasoned that the sense of taste might also be enhanced in CBP. Detection and recognition thresholds were established for a sour taste and ratings of both suprathreshold taste intensity and pleasantness-unpleasantness perception were collected for sweet, sour, salty and bitter stimuli in 11 CBP patients and 11 matched control subjects. As a control, ratings were also collected for visual assessment of degree of grayness. There was no difference between CBP and control subjects for visual grayness rating. On the other hand, CBP patients in comparison to control subjects rated gustatory stimuli as significantly more intense but no more or less pleasant and showed a trend towards a lower detection threshold (i.e. increased sensitivity). The selectivity of the taste disturbance suggests interaction between pain and taste at specific brain sites and provides further evidence that CBP involves specific brain abnormalities.
Original language | English (US) |
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Pages (from-to) | 124-130 |
Number of pages | 7 |
Journal | Pain |
Volume | 120 |
Issue number | 1-2 |
DOIs | |
State | Published - Jan 2006 |
Funding
We would like to thank Seamus Bhatt-Mackin for help in data collection, and Y. Erica Mak and Katharine Simmons for help in the preparation of taste solutions and thoughtful criticism of this text. Funding was provided from grant NS35115 awarded to A.V.A. by NIH-NINDS.
Keywords
- Chronic pain
- Gustation
- Insula
- Sensitivity
- Thresholds
ASJC Scopus subject areas
- Clinical Neurology
- Neurology
- Anesthesiology and Pain Medicine