Sourness and bitterness: confusions over sequences of taste judgements.

@article{Gregson1973SournessAB,
  title={Sourness and bitterness: confusions over sequences of taste judgements.},
  author={Robert A. M. Gregson and Ailsie F. Baker},
  journal={British journal of psychology},
  year={1973},
  volume={64 1},
  pages={
          71-6
        }
}
Confusions between bitterness and acidity in the perception of three taste stimuli - quinine sulphate, citric acid and disodium-5i-guanylate - were examined over the near-threshold range in 45 subjects, using an extended ascending series procedure and intensity ratio estimations. Individual differences, and the effects of reference information, were marked. The results are interpreted in terms of a cosine model of qualitative confusions. 
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