Duplexity Theory of Taste

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Science  21 Aug 1964:
Vol. 145, Issue 3634, pp. 834-835
DOI: 10.1126/science.145.3634.834


When two different taste stimuli are presented, one to the left and the other to the right side of the tongue, they may add together to a sensation in the middle of the tongue, or they may stay separated. This phenomenon can be used to show that the four primary taste sensations seem to form two well-differentiated groups. Warm and cold stimuli act similarly to the four primary taste stimuli, thus separating the sensations on the tongue into two groups: bitter, warm, sweet; and sour, cold, salty.