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Related Experiment Video

Updated: Jan 24, 2026

An Olfactory Preference Test for Measuring Olfactory Hedonic Biases in Mouse Models of Depression
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Licking microstructure and hedonic changes after flavour preference learning in rats.

John Edmond Riordan1, Dominic Michael Dwyer1

  • 1School of Psychology, Cardiff University, Cardiff, UK.

Quarterly Journal of Experimental Psychology (2006)
|May 31, 2019
PubMed
Summary

Learned preference for a flavor cue (CS) is confirmed, but licking microstructure analysis shows a small effect size for hedonic changes. This method may be insensitive for assessing learned flavor preferences.

Keywords:
Flavourhedonic evaluationlearningpreferencetaste

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Area of Science:

  • Behavioral neuroscience
  • Sensory science
  • Learning and memory

Background:

  • Learned preference for a flavor conditioned stimulus (CS) is established by pairing it with a nutrient reward.
  • Prior research suggests this learning increases the hedonic value of the CS, but this effect's reliability needs further investigation.

Purpose of the Study:

  • To investigate the hedonic changes associated with flavor preference learning using licking microstructure analysis.
  • To determine the reliability and effect size of hedonic changes in CS flavors after associative learning.

Main Methods:

  • Rats were trained with flavor CS+ paired with 16% sucrose or maltodextrin, with control CS- paired with 2% solutions.
  • Licking microstructure (lick cluster size) was analyzed to assess changes in hedonic value.
  • A meta-analysis of current and published data was performed to calculate the overall effect size.

Main Results:

  • A reliable preference for the CS+ was observed in all conditions.
  • A learned increase in lick cluster size was found when considering all conditions together, but was significant in only one condition.
  • Meta-analysis revealed a small Cohen's d effect size (0.16) for licking microstructure changes after flavor preference learning.

Conclusions:

  • Flavor preference learning reliably produces hedonic changes in cue flavors.
  • Licking microstructure analysis following voluntary consumption of CS-US compounds may be an insensitive method for assessing these learned hedonic changes.