Supporting citations use verified paraphrases and PDF-sheet locators from the canonical local copies.
Differences among tasters may reflect stable thresholds, sensory abilities, learned categories, attention, culture, or experience; analysis should characterize that variation before averaging it away.
Reviewed 2026-08-29 against the cited source pages during the complete text-and-visual corpus pass.
Variation must be characterized with appropriate design and replication; not every disagreement is stable or informative.
Thresholds, receptor differences, expertise, expectation, and panel construction provide plausible structured sources of variation.
Created from a deduplicated cross-source synthesis; retain the stated qualifications when drafting. Fresh Goode audit: PDF232 and388–394 support individual variation with learned/contextual influences. Small samples and PROP findings do not establish universal learner rankings or prevalence.