eLife Assessment
This is an important study that combines replications of findings and novel detailed MRI investigations to assess the impact of environmental enrichment and maternal behavior on mice brain structure at different stages of development. The results and evidence supporting the conclusions are convincing, but in detail, the interpretation is challenging, in particular due to inter-individual and inter-litter variability. The extent to which maternal care mediates the impact of enrichment on brain development during the perinatal period also remains unclear because behavior was observed only during short periods, and the performed analyses are still incomplete. This study will nevertheless be of significant interest to neuroscientists and researchers interested in neurodevelopment in relation to environmental factors because of its in-depth use of MRI to study brain plasticity in mice.