Microstructural analysis of conditioned and unconditioned responses to maltodextrin.
1School of Psychology, Cardiff University, Cardiff, Wales. dwyerdm@cardiff.ac.uk
Learning & Behavior
|June 12, 2008
Summary
Flavor conditioning enhances the palatability of associated cues, influencing licking behavior independently of unconditioned stimulus concentration. This suggests conditioned responses and unconditioned responses share neural representations.
Area of Science:
- Neuroscience
- Behavioral Science
- Sensory Science
Background:
- Licking microstructure analysis reveals detailed consummatory behaviors.
- Flavor-nutrient learning is crucial for predicting food rewards and guiding intake.
Purpose of the Study:
- To investigate how flavor cues associated with a palatable substance (maltodextrin) influence licking responses.
- To explore the interaction between conditioned responses to flavors and unconditioned responses to maltodextrin.
Main Methods:
- Analysis of licking microstructure, including lick cluster size and inter-lick intervals.
- Associative learning paradigm pairing distinct flavors with different maltodextrin concentrations (conditioned stimulus [CS+] with 16% maltodextrin, CS- with 2% maltodextrin).
Main Results:
- Lick cluster size increased monotonically with maltodextrin concentration.
- Consumption was higher for the CS+ flavor than the CS- flavor at low maltodextrin concentrations (2%), but not at high concentrations (16%).
- Cluster size was consistently larger for the CS+ compared to the CS-, irrespective of maltodextrin concentration.
Conclusions:
- Flavor conditioning can alter the perceived palatability of associated flavors.
- Conditioned flavor cues can modulate consummatory behavior, impacting both intake and licking microstructure.
- Results support the hypothesis that conditioned and unconditioned responses to flavors and rewards are mediated by shared neural representations.
