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Updated: Oct 29, 2025
The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents
Published on: July 8, 2015
Reduced risk aversion and impaired short-term memory in juvenile rats with malformation of cortical development
Eun-Jin Kim1, Minyoung Lee1, Min-Jee Kim2
1Asan Institute for Life Sciences, Asan Medical Center, Seoul, South Korea; Department of Pediatrics, Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, Seoul, South Korea.
Abstract:
Malformation of cortical developments (MCDs) is currently an incurable disease and is associated with significant neuropsychological problems, such as intellectual disability, epilepsy, and anxiety disorders from a young age. Development of a suitable animal model and pathophysiological study is therefore necessary to better understand and treat MCDs from being an incurable disease. The Y-maze, open field, and fear conditioning studies were performed at postnatal days 40-44 to validate the behavioral phenotypes of the existing rat model of MCD with prenatal methylazoxymethanol exposure at their developmental period. The study results show that juvenile rats with MCD spent significantly less time inside the novel arms in Y-maze and less time in the peripheral zones of the open field. Additionally, the rats with MCDs showed attenuated freezing behavior to sound and light cues as well as to context after fear conditioning. This comprehensive behavioral analysis of rats with MCDs at the juvenile period indicate a lack of spatial memory, decreased anxiety, and learning disability in these rats, which is compatible with the human behavioral phenotype of MCDs and can be used as the behavioral biomarkers for future translational research.
Insights
This study validates a rat model for Malformation of Cortical Development (MCDs), revealing deficits in spatial memory, reduced anxiety, and learning impairments in juvenile rats, offering biomarkers for future research.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Models
Background:
- Malformation of Cortical Development (MCDs) are incurable neurological disorders causing significant lifelong neuropsychological issues.
- Effective treatment strategies necessitate the development of robust animal models for studying MCD pathophysiology.
Purpose of the Study:
- To validate the behavioral phenotypes of a prenatal methylazoxymethanol (MAM) exposed rat model of MCDs.
- To establish behavioral biomarkers for future translational research in MCDs.
Main Methods:
- Behavioral testing including Y-maze, open field, and fear conditioning was conducted on juvenile rats (postnatal days 40-44).
- Rats were exposed to MAM prenatally to induce MCDs.
Main Results:
- MCD rats exhibited reduced exploration of novel arms in the Y-maze, indicating impaired spatial memory.
- MCD rats showed decreased thigmotaxis (peripheral zone exploration) in the open field, suggesting reduced anxiety.
- Fear conditioning revealed attenuated freezing responses to auditory, visual, and contextual cues in MCD rats, indicating learning deficits.
Conclusions:
- The MAM-exposed rat model displays behavioral phenotypes consistent with human MCDs, including spatial memory deficits, reduced anxiety, and learning disabilities.
- This validated animal model provides crucial behavioral biomarkers for advancing MCD research and therapeutic development.
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