Age-related changes in conditioned flavor preference in rats
Adam F Renteria1, Bryant C Silbaugh, Jerlyn C Tolentino
1Department of Psychology, San Diego State University, San Diego, CA 92120, USA.
Behavioural Brain Research
|December 7, 2007
Summary
Aging impairs the ability to associate flavors with rewards. Young rats preferred previously sweetened flavors, while older rats showed no preference, indicating a decline in associative memory for reward.
Area of Science:
- Neuroscience
- Gerontology
- Behavioral Science
Background:
- Age-related changes affect brain regions involved in reward processing.
- Limited research exists on how aging impacts associative memory for rewards.
Purpose of the Study:
- To investigate the effects of aging on the ability to form flavor-reward associations.
- To compare conditioned flavor preference in young versus aged rats.
Main Methods:
- A conditioned flavor preference task was used with 7- and 24-month-old rats.
- Rats were trained to associate specific flavors with a sweet reward (CS+) or no reward (CS-).
- Preference was tested by simultaneously presenting two unsweetened flavors.
Main Results:
- Young rats (7-month-old) demonstrated a significant preference for the previously rewarded flavor (CS+).
- Aged rats (24-month-old) did not show a significant preference between the previously rewarded (CS+) and unrewarded (CS-) flavors.
- Consumption levels were similar for both CS+ and CS- in aged rats.
Conclusions:
- The capacity to form flavor-reward associations diminishes with age.
- Aging leads to impaired conditioned flavor preference, suggesting a decline in reward-related associative memory.
