Somatosensation, Taste, and Smell (6A) Practice Test

A sensory interaction study investigates why carbonated beverages can feel “sharp.” Participants sip (through a straw) either still water or carbonated water. Both are unsweetened and served cold. Participants rate (1–7) (i) tingling/burning sensation and (ii) “taste intensity.” Carbonated water is rated much higher on tingling/burning, even though participants describe minimal change in basic taste.

Which explanation best aligns with these observations?

In a sensory interaction study, 60 adults taste two tomato soups in counterbalanced order. Soup X is served with a normal aroma; Soup Y is served while participants wear a nose clip that reduces airflow through the nasal cavity. Both soups are matched for temperature and basic tastes (sweet, salty, sour, bitter, umami) using pilot testing. After each sample, participants rate (1–7) overall flavor intensity and identify any “herb” notes.

Small data summary:

• Normal aroma: mean flavor intensity = 6.1; “herb” identification = 78%
• Nose clip: mean flavor intensity = 3.4; “herb” identification = 22%

Based on the study, which explanation best aligns with the observed change in flavor perception when the olfactory pathway is disrupted?