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Updated: Apr 15, 2026
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Targeted Training of Ultrasonic Vocalizations in Aged and Parkinsonian Rats
Published on: August 8, 2011
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Harmonic and frequency modulated ultrasonic vocalizations reveal differences in conditioned and unconditioned reward
Erik J Garcia1, Talus J McCowan1, Mary E Cain1
1Kansas State University, United States.
Behavioural Brain Research
|April 2, 2015
Summary
Novelty and sensation seeking (NSS) and ultrasonic vocalizations (USVs) measure reward sensitivity. While NSS screens are uncorrelated, specific USV subtypes, like harmonic 50 kHz USVs, correlate with novelty preference, revealing nuanced reward processing.
Area of Science:
- Neuroscience
- Behavioral Science
- Animal Behavior
Background:
- Novelty and sensation seeking (NSS) and ultrasonic vocalizations (USVs) are established measures of individual differences in reward sensitivity in rodents.
- Existing NSS screens (e.g., inescapable novelty, novelty place preference) are uncorrelated and linked to distinct aspects of drug abuse.
- 50 kHz USVs reflect affective states in rats, particularly in response to positive stimuli, but their relationship with NSS traits is unknown.
Purpose of the Study:
- To investigate the relationship between different measures of novelty and sensation seeking (NSS) and ultrasonic vocalizations (USVs) in rats.
- To determine if specific USV subtypes correlate with established NSS behavioral paradigms.
- To elucidate how USV subtypes contribute to understanding reward processing in relation to individual differences.
Main Methods:
- Rats were screened for novelty-seeking behaviors using established paradigms.
- Ultrasonic vocalizations (USVs) of all call types were recorded during social play with a heterospecific.
- Correlations between NSS screen scores and USV parameters (overall and by subtype) were analyzed.
Main Results:
- No significant correlations were found between the overall NSS screens (inescapable novelty and novelty place preference).
- However, harmonic 50 kHz USVs showed a positive correlation with the novelty place preference screen.
- Harmonic 50 kHz USVs increased in contexts associated with reward anticipation, while FM USVs responded specifically to direct tickling stimulation.
Conclusions:
- Standard NSS screens measure distinct individual difference traits.
- USV subtypes, specifically harmonic 50 kHz USVs, provide a more nuanced understanding of reward processing and incentive value attribution.
- Harmonic and FM USV subtypes can be valuable tools for studying reward processing beyond traditional NSS measures.
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