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Probabilistic models for sequential taste effects in triadic choice

D M Ennis1, M O'Mahony

  • 1Philip Morris Research Center, Medical College of Virginia, USA.

Journal of Experimental Psychology. Human Perception and Performance
|October 1, 1995
PubMed
Summary
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New models account for sequential effects in triadic choice, revealing a water-salt taste continuum. Only one prior stimulus influenced choices, not salt concentration itself.

Area of Science:

  • Psychophysics
  • Sensory Science
  • Decision Making

Background:

  • Positional response bias and sequential effects can influence sensory judgment tasks.
  • Understanding these biases is crucial for accurate psychophysical measurements.

Purpose of the Study:

  • To develop and apply new models for triadic choice that incorporate sequential effects and positional bias.
  • To investigate the influence of prior oral stimuli on taste perception.
  • To determine the relationship between physical salt concentration and perceived taste intensity.

Main Methods:

  • Application of Thurstonian models (Richardson's method of triads and a 3-alternative forced-choice model) to experimental data.
  • Utilized triangular and 3-alternative forced-choice methods with human participants.

Related Experiment Videos

  • Introduced and evaluated the concept of a "conditional stimulus" influenced by prior oral exposure.

    • Main Results:

    • Maximum likelihood estimates indicated that only one prior stimulus was necessary to explain the observed choices.
    • Positional bias and sequential effects were successfully accounted for in the new triadic choice models.
    • Salt concentration differences did not directly correspond to the mental representations of the conditional stimuli.

    Conclusions:

    • The results support a continuum of taste perception from water to salt.
    • The concept of a conditional stimulus effectively models the impact of prior oral experiences on taste judgments.
    • Sensory perception is influenced by the history of stimuli, not just the immediate physical properties.