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Published on: December 29, 2014
Environmental enrichment normalizes hippocampal timing coding in a malformed hippocampus
Amanda E Hernan1, J Matthew Mahoney1, Willie Curry1
1Department of Neurological Sciences, University of Vermont College of Medicine, Burlington, Vermont, United States of America.
Environmental enrichment (EE) improves spatial cognition in a methylazoxymethanol (MAM) model of neurodevelopmental disorders. EE normalizes fine spike timing (FST) in the hippocampus, suggesting FST as a therapeutic target for cognitive impairments.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Cognitive Neuroscience
Background:
- Malformations of Cortical Development (MCD) are linked to psychiatric disorders, learning impairments, and epilepsy.
- The methylazoxymethanol (MAM) model exhibits spatial cognition deficits, which are ameliorated by post-weaning environmental enrichment (EE).
Purpose of the Study:
- To investigate how environmental enrichment (EE) influences network-level mechanisms underlying spatial cognition in the MAM model.
- To determine the role of fine spike timing (FST) in hippocampal function and its modulation by EE.
Main Methods:
- In vivo single unit recordings in the hippocampus of freely moving MAM-model animals.
- Generalized linear modeling to analyze fine spike timing (FST) characteristics and place cell fidelity.
- Correlation analysis between FST parameters and spatial coherence of hippocampal neurons.
Main Results:
- MAM-induced neurodevelopmental insults disrupt FST and place-modulated rate coding in the hippocampal CA1 region.
- Environmental enrichment (EE) significantly improves multiple FST parameters, restoring them towards normal levels.
- FST parameters were found to predict the spatial coherence of hippocampal neurons, highlighting their importance in cognitive function.
Conclusions:
- Altered FST mechanisms are critically involved in the cognitive impairments observed in malformations of cortical development (MCD).
- Environmental enrichment (EE) offers a potential therapeutic strategy by normalizing FST, even in the presence of structural brain abnormalities.
- FST parameters represent a promising therapeutic target for improving cognitive function in neurodevelopmental disorders.
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