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Published on: December 4, 2013
Effects of early rearing conditions on cognitive performance in prepubescent male and female rats
Kathryn A Frankola1, Arianna L Flora, Amanda K Torres
1Program in Neuroscience, Tulane University, New Orleans, LA 70118, USA.
Insights
Early life maternal separation impacts rat cognition differently based on sex. Males showed memory impairments, while females exhibited comparable or enhanced memory performance.
Area of Science:
- Neuroscience
- Developmental Psychology
- Animal Behavior
Background:
- Early mother-offspring interactions are crucial for cognitive development in altricial species.
- Postnatal rearing conditions can significantly influence later cognitive functions.
Purpose of the Study:
- To investigate the impact of maternal separation duration on cognitive performance in male and female Long-Evans rats before puberty.
- To determine if biological sex moderates the effects of early life stress on memory functions.
Main Methods:
- Rat pups were subjected to either brief handling (15 min daily) or prolonged maternal separation (180 min daily) from postnatal days 2-14.
- Cognitive functioning was assessed in male and female rats between days 25-36 using object recognition, Y-maze, and water maze tasks.
Main Results:
- Maternally separated male rats displayed significant impairments in non-spatial and spatial memory compared to handled males.
- Maternally separated female rats showed no memory deficits and, in some cases, improved performance relative to handled females.
- Sex differences in cognitive responses to rearing conditions were observed prior to puberty, suggesting limited influence of gonadal hormones.
Conclusions:
- Biological sex is a critical factor moderating the effects of early life maternal separation on cognitive development.
- The observed sex differences in cognitive outcomes may be linked to variations in maternal care directed towards male and female offspring.
- These findings highlight the complex interplay between early environment, sex, and cognitive trajectory.
Abstract:
The interactions between a mother and her offspring during early postnatal life impact cognitive development in altricial species. The current study examined the influence of postnatal rearing conditions on subsequent cognitive functioning in male and female Long-Evans rats prior to puberty. Maternal conditions were manipulated by repeated separations of rat pups from their dams on postnatal days 2 though 14. In the early handling condition, pups were removed from mothers briefly for 15min daily, while in the maternal separation condition pups were separated from their mothers for 180min daily. Offspring from handled or separated litters were evaluated prior to puberty between days 25-36 of life on a battery of cognitive tasks that assessed several types of memory. Male rats separated from mothers for 180min were impaired in their non-spatial and spatial memory compared to early-handled males as indicated by their performance on an object recognition task, a Y-maze task, and reference and working memory versions of the water maze task. In contrast, maternally-separated females were not impaired, and in some cases performed better on memory tasks, compared to early-handled females. Results indicate that the biological sex of offspring moderated the effects of maternal conditions on diverse cognitive tasks. Because sex differences were evident prior to puberty, gonadal hormones likely had a limited influence on cognition. Although the bases for sex differences in the cognitive response to rearing conditions are unknown, disparities in maternal attentiveness directed toward male and female offspring may play a role.
