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Simultaneous temporal processing is sensitive to prenatal choline availability in mature and aged rats
1Department of Psychology: Experimental, Duke University, Durham, NC 27708, USA.
Insights
Prenatal choline supplementation supports lifelong cognitive function in rats. Conversely, choline deficiency impairs attention and speeds age-related declines in temporal processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Nutritional Science
Background:
- Choline is vital for brain development and function.
- Age-related cognitive decline is a significant concern.
- The long-term effects of prenatal choline status on cognition are not fully understood.
Purpose of the Study:
- To investigate the lifelong effects of prenatal choline supplementation and deficiency on cognitive functions in rats.
- To assess impacts on attention and temporal processing across different age groups.
Main Methods:
- Rats were trained on a peak-interval timing procedure using auditory and visual stimuli signaling different fixed-interval schedules (15s and 30s).
- Cognitive performance was evaluated in young (2-4 months) and aged (24-26 months) rats with varying prenatal choline exposure (supplemented, deficient, control).
Main Results:
- Choline-supplemented rats showed increased attention to both 15s and 30s signals.
- Choline-deficient rats exhibited decreased attention to the 30s signal, worsening with age.
- Aged choline-deficient and control rats showed age-related temporal processing deficits, absent in supplemented rats.
Conclusions:
- Prenatal choline supplementation confers lasting cognitive benefits, enhancing attention and temporal processing throughout life.
- Prenatal choline deficiency leads to impaired divided attention and accelerated age-related deficits in temporal processing.
- Choline is crucial for maintaining cognitive function and mitigating age-related decline.
Abstract:
Rats were trained at 2-4 months and at 24-26 months of age on a peak-interval timing procedure in which auditory and visual stimuli signaled two different fixed-interval schedules of reinforcement (15 and 30 s) that were presented simultaneously in a hierarchical fashion. Compared with control rats, increases in the probability of attention to the 15 s signal were observed for both the choline-supplemented and the choline-deficient rats. In contrast, an increase in attention to the 30 s signal was only observed for the choline-supplemented rats, whereas choline-deficient rats exhibited a decrease in attention that increased with age. Proportional rightward shifts in the remembered times of reinforcement emerged for the 24-26-month-old rats in the choline-deficient and control groups, but not in the choline-supplemented group. These results indicate that prenatal choline supplementation facilitates cognitive function across the lifespan, whereas prenatal choline deficiency impairs divided attention and accelerates age-related declines in temporal processing.