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Early postnatal hyperthyroidism improves both working and reference memory in a spatial radial-maze task in adult
1Génétique, Neurogénétique et Comportement, URA 1294 CNRS, UFR Biomédicale, Université Paris V René Descartes, France.
Physiology & Behavior
|July 1, 1991
Summary
Thyroid hormone treatment in mice enhanced spatial learning and memory. This suggests that the intra- and infrapyramidal mossy fiber terminal fields play a crucial role in cognitive functions.
Area of Science:
- Neuroscience
- Endocrinology
- Behavioral Science
Background:
- The intra- and infrapyramidal mossy fiber terminal fields (iip-MF) are implicated in spatial memory.
- Previous research indicates a positive correlation between iip-MF size and memory performance.
Purpose of the Study:
- To investigate the functional role of iip-MF in spatial learning and memory.
- To determine if L-thyroxine-induced hyperplasia of iip-MF improves cognitive performance.
Main Methods:
- Newborn DBA/2J mice were injected with L-thyroxine to induce iip-MF hyperplasia.
- Cognitive performance was assessed using a spatial radial maze task, evaluating both reference and working memory.
Main Results:
- Mice treated with L-thyroxine exhibited improved performance in both reference and working memory tasks.
- The results support the hypothesis that iip-MF are involved in spatial memory regulation.
Conclusions:
- L-thyroxine-induced iip-MF hyperplasia enhances spatial learning and memory in mice.
- The iip-MF are functionally integral to the regulation of spatial memory processes.