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Plasma corticosterone fluctuations in an infant-learning paradigm
M B Hennessy1, A C Collier, A C Griffin
1Department of Psychology, Wright State University, Dayton, Ohio 45435.
Behavioral Neuroscience
|October 1, 1988
Summary
Maternal presence reduces stress hormone (corticosterone) levels in infant rats during learning tasks. This suggests mothers play a key role in modulating infant stress responses and learning.
Area of Science:
- Developmental Psychology
- Neuroendocrinology
- Animal Behavior
Background:
- Infant stress responses are critical for development and learning.
- Maternal care significantly influences the physiological and behavioral development of offspring.
- Understanding the neuroendocrine mechanisms underlying infant stress is essential.
Purpose of the Study:
- To investigate plasma corticosterone fluctuations in infant rats during a learning task.
- To examine the impact of maternal deprivation and presence on stress responses.
- To explore the role of the dam in moderating pup's corticosterone levels.
Main Methods:
- Collected blood samples from 10- and 15-day-old rat pups.
- Exposed pups to different conditions: no disturbance, maternal deprivation, or deprivation with a learning task.
- Assessed plasma corticosterone levels following varying durations of isolation or dam presence.
Main Results:
- Plasma corticosterone levels increased in pups after deprivation and training, and in 15-day-old pups after deprivation alone.
- The presence of the anesthetized dam significantly reduced corticosterone elevations.
- This moderating effect was more pronounced in 15-day-old pups and at longer exposure times (60 min).
Conclusions:
- Maternal presence effectively buffers the stress response in infant rats.
- The dam's capacity to moderate corticosterone suggests a significant role in reinforcement during learning.
- These findings highlight the importance of maternal care in shaping infant neuroendocrine and learning processes.