Brain HealthGreen Cities May Guard Against Dementia — Here's How to Measure It
Living near parks, trees, and green areas appears to lower dementia risk, but research in this area has been inconsistent largely because scientists measure 'greenspace' in different ways. A new interdisciplinary expert working group tackled this problem by reviewing what we know about how nature exposure affects brain health and developing consensus recommendations for which greenspace metrics to use and when. They identified three main protective pathways: tree canopy cover helps reduce stress and restore attention, parks encourage physical activity and social connection, and general vegetation greenness limits exposure to air pollution and heat. The team highlights the Normalized Difference Vegetation Index (NDVI) as a versatile tool that captures multiple pathways at once. These guidelines aim to make future studies more rigorous and directly comparable, ultimately helping translate findings into urban planning policy.
