Enrichment and photoperiod interact to affect spatial learning and hippocampal dendritic morphology in white-footed mice (Peromyscus leucopus)

The European Journal of Neuroscience
Joanna L WorkmanRandy J Nelson

Abstract

In seasonally changing environments, individuals must coordinate endogenous processes with ambient conditions. Winter is a challenging time to survive and reproduce. In order to anticipate decreased food availability and low temperatures in winter, many rodents use decreasing day lengths as a precise temporal cue. Short day lengths alter several adaptations, including reproduction, immune function, aggressive behavior and spatial learning in non-tropical rodents. Specifically, short days impair spatial learning in white-footed mice (Peromyscus leucopus) and alter dendritic complexity in the hippocampus. The goal of the current study was to determine whether short days constrain neural plasticity. If short days limit the capacity for plasticity, then environmental enrichment, a manipulation that induces morphological changes, should alter dendritic morphology in long, but not short, days. Male white-footed mice were assigned to long (16 : 8 LD) or short (8 : 16 LD) photoperiod in either enriched or standard cages. Enrichment consisted of a large cage, cage mates, Habitrail tubes, a nest box and a running wheel. Mice were tested in the Morris water maze. Reproductive tissues were collected and weighed; brains were processed for d...Continue Reading

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Citations

Jun 18, 2015·ELife·Nicole L Bedford, Hopi E Hoekstra
Aug 31, 2010·Neuroscience and Biobehavioral Reviews·Joanna L Workman, Randy J Nelson
Dec 16, 2010·Frontiers in Neuroendocrinology·James C WaltonRandy J Nelson
Nov 25, 2017·The Journal of Experimental Biology·Javier LázaroDina K N Dechmann
Feb 1, 2011·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·Alán AlpárUlrich Gärtner
Apr 18, 2018·Brain Structure & Function·Javier LázaroDina K N Dechmann
Aug 4, 2021·Biological Reviews of the Cambridge Philosophical Society·Connor T Lambert, Lauren M Guillette

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