Sensory Evaluation Notes

Learning Outcomes

  • Explain concepts, methods, and applications of sensory evaluation, including physiological and psychological foundations.

  • Outline principles of various sensory evaluation methods: descriptive, discriminative, and affective testing.

  • Apply and interpret statistical analysis of sensory evaluation methods.

  • Discuss methodological aspects, food quality control, and consumer preference in sensory evaluation.

Factors Influencing Sensory Verdict

  • Influenced by physiology, psychology, and psychophysics.

  • Examines food perception and cognitive psychology frameworks.

  • Gender differences affect food preferences.

Physiological and Psychological Considerations

Physiological Factors

  • Cross-adaptation: Sensitivity affected by preceding stimuli.

  • Cross-potentiation: Enhanced sensitivity due to the presence of another substance.

  • Enhancement/Synergy/Suppression effects on perceived flavor intensity.

  • Saliva's role in taste perception and flavor release.

Psychological Factors

  • Habituation and stimulus errors can affect evaluations.

  • Contrast effects and central tendency errors impact ratings.

  • Expectation and logical errors may influence sensory judgment.

  • Happiness/sadness can alter food preferences; comfort foods are often sought during emotional distress.

Principles of Good Practices in Sensory Testing

  • Conduct blind tests to avoid biases.

  • Randomize sample presentation to prevent systematic errors.

  • Maintain controlled sample handling to avoid contamination.

Facilities in Sensory Evaluation Laboratories

  • Key features: Clean, calm, convenience, and comfort.

  • Areas required: Testing booths, preparation area, and distribution area.

  • Maintain controlled noise levels, free from any odors.

  • Keep testing environments comfortable (e.g., temperature 20°C, 62% humidity).

References

  • Meilgaard, M.C., Carr, B.T., & Carr, B.T. (2007). Sensory Evaluation Techniques (4th ed.). CRC Press.