bitter aftertaste
concept / concept-bitter-aftertaste
苦い後味
Bitter aftertaste is a temporal phase of bitterness that remains after swallowing or spitting out, or emerges when mixture suppression is released.
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Reading the bitterness
Bitter aftertaste is bitterness remaining after swallowing or spitting out, or emerging when suppression by a mixture ends. In an experiment adapting participants to a quinine-sucrose mixture and then presenting individual solutions at the same molar concentrations, those adapted to the mixture perceived stronger residual bitterness (or residual sweetness when sucrose alone was presented) than those adapted to an individual solution.
This suggests that bitterness and sweetness suppressed each other in the mixture; the authors locate the suppression in peripheral sensory mechanisms. The view that bitterness hidden during suppression emerges as 「後味」 (in translation: "aftertaste") when the mixture breaks apart helps consider bitterness over time rather than only as an isolated intensity. The experiment, however, presented stimuli to the front of human tongues, and direct applicability to aftertaste in actual dishes remains untested.
In Chinese tea, 「回甘」 (in translation: "huigan") denotes sweetness becoming dominant after bitterness or astringency; its definition explicitly describes a time course in which sweetness overtakes bitter-astringent taste and ends in sweetness. Bitter aftertaste describes 「苦味が残る、または再び現れる」 (in translation: "bitterness remains or reappears"), whereas huigan describes the opposite direction, 「甘味へ転じる」 (in translation: "turns toward sweetness"). Both concern an aftertaste time window but point to opposite sensations. This distinction is editorial; no study tracking both time curves together has yet been confirmed.
A time-intensity study of caffeine and quinine at 4 concentrations adjusted to equal bitterness reported, for both compounds, a correlation between greater bitter intensity and longer aftertaste duration, but no change in time to peak intensity. At equal bitterness, caffeine aftertaste lasted longer than quinine aftertaste. Only the abstract has been checked.
A sip-and-spit study of 63 adults compared 3 bitter solutions—quinine, sucrose octaacetate (SOA), and tetralone—matched for in-mouth intensity. At 15 seconds after spitting out, quinine aftertaste was consistently weaker than that of the other 2, suggesting it dissipated faster. Compared with in-mouth ratings, aftertaste intensity at 15 seconds fell significantly for all 3 substances at the front of the tongue; for quinine, it fell at all sites: front, middle, and back of tongue, palate, and lips.
Sources for this overview
Paradoxical adaptation to taste mixtures
Checked for this overview: Checked bitterness persisting after adaptation to a mixture. / Checked a sensation arising after release of suppression.
Checked for this overview: Checked the distinction that huigan moves in the opposite sensory direction.
Comparison of bitterness of caffeine and quinine by a time-intensity procedure
Checked for this overview: Correlation between caffeine/quinine aftertaste duration and bitter intensity.
Regional Variation of Bitter Taste and Aftertaste in Humans
Checked for this overview: Finding that quinine aftertaste dissipated faster than SOA and tetralone. / Finding of declining aftertaste intensity at the front of the tongue over time.
Follow the connections
sweet aftertaste →differs from→ bitter aftertaste
Hypotheses and recipe candidates for this entry are on the Japanese page.
Structured claims — open a section to read each claim's confidence, evidence and limits
Sensory (4)
Scope: A 16-stimulus sequence of quinine, sucrose, mixture, and water flowed over the human anterior tongue
Note: The authors suggest a peripheral mechanism for the suppression within the mixture. Not tested for aftertaste in cooking.
Show data
concept-bitter-aftertaste —can_generate→ "After adaptation to a quinine-sucrose mixture, residual bitterness with quinine alone and residual sweetness with sucrose alone"Scope: Layer: solution. Time-intensity method.
Note: Abstract only (full text inaccessible due to an Oxford Academic subscription barrier). A 1986 paper not indexed in PubMed/Europe PMC.
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concept-bitter-aftertaste —has_perceived_bitterness_associated_with→ "In time-intensity ratings of 4 equally bitter concentrations each of caffeine and quinine, greater bitterness intensity strongly correlated with longer aftertaste for both, while time to peak intensity did not change. At equal bitterness, caffeine aftertaste lasted longer than quinine aftertaste."Scope: Layer: solution. Sip-and-spit method (experiment 1, n=63).
Show data
concept-bitter-aftertaste —has_perceived_bitterness_associated_with→ "Although initial in-mouth intensities were matched for 3 bitter substances—quinine, SOA (sucrose octaacetate), and tetralone—quinine aftertaste intensity at 15 seconds after spitting out was consistently below that of the other 2, suggesting quinine bitterness dissipated (cleared up) faster."Scope: Layer: solution. Sip-and-spit method (experiment 1, n=63).
Show data
concept-bitter-aftertaste —has_perceived_bitterness_associated_with→ "At the front of the tongue, aftertaste intensity declined significantly over time for every bitter stimulus tested (quinine, SOA, tetralone). For quinine, it declined over time at every site: front, middle, and back of tongue, palate, and lips."Culture (1)
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concept-huigan —differs_from→ concept-bitter-aftertaste