Spending time in natural surroundings has long been associated with relaxation and emotional calm but new scientific analysis shows its benefits have clear limits. A recent review published in the April 2026 issue of Neuroscience and Biobehavioral Reviews examined how exposure to nature affects brain function using measurable neurological data rather than personal experience alone.
Dr Jay Jagannathan a neurosurgeon at the Michigan Neurosurgery Institute discussed the findings explaining that multiple studies using brain imaging tools such as fMRI EEG fNIRS and structural MRI show reduced activity in stress related brain networks after nature exposure. These networks are commonly linked to rumination threat monitoring and persistent self focused thinking. According to Dr Jagannathan the effects are measurable and not purely psychological.
The review also found evidence that time spent in natural environments may support attention restoration by helping the brain shift out of an overstimulated state. Some studies observed differences in grey and white matter volumes in people with regular access to green spaces although researchers emphasized that these findings show correlation rather than direct causation.
From a biological perspective Dr Jagannathan explained that the human brain is constantly scanning for danger and safety. Natural environments tend to reduce excessive sensory input and threat signals allowing stress circuits to quiet down. However he clearly stated that nature exposure should not be mistaken for therapy or a substitute for medication.
The review highlights several limitations including inconsistent definitions of nature exposure unclear duration and dosage and limited understanding of long term neurological effects. While nature may act as a supportive environment that helps the brain regulate stress it does not replace professional mental health care. Medical treatment and therapy remain essential for managing diagnosed conditions.