Taste and aging.

Taste thresholds are known to rise with age, but the status of suprathreshold sensations is less clear. The present study assessed the perceived intensities of sodium chloride, sucrose, citric acid, and quinine hydrochloride with the method of magnitude matching. This method takes advantage of participants' ability to judge sensations from two sensory continua (in this case taste intensity and loudness) on a common intensity scale, in effect, matching them. Elderly and young adults matched most of the moderate and strong tastes to the same loudnesses. If the sounds were equivalently loud to elderly and young adults, then these results would mean that moderate and strong tastes were also equivalently strong, that is, taste sensation had not faded for our elderly adults. Water and dilute taste solutions were matched to louder sounds by elderly than young participants. This may reflect the presence of a mild dysgeusia (background taste).