The magnitude matching test uses whole mouth stimulation (i.e., "sip and spit"). The tones (covering the range from very soft to very loud) are interspersed with the taste stimuli. At the end of the session, the subjects are asked to give magnitude estimates to the adjectives "very strong," "strong," "medium," "weak," and "very weak" on the same scale used for the tastes and tones ( Moskowitz, 1983).
The data for the same subjects whose spatial data were discussed earlier were analyzed two ways: normalized to tones and normalized to adjectives. A comparison of the two methods of normalization shows that normalization to tones (e.g., magnitude matching) discriminated among the etiologies better than normalization to adjectives did.
In summary, some etiologies produce localized taste losses of which the patients are unaware. These losses may be dramatic when evaluated with the spatial test (e.g., taste may be absent on one side of the mouth) but show no effect on the whole mouth test.
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