The study suggests it may trigger lasting changes in brain activity and thinking that remain measurable for at least one month. In recent years, scientists have become interested in whether these temporary experiences might also lead to lasting improvements in mental health. Researchers monitored brain activity with EEG during the experience and later used MRI-based brain scans to examine possible longer-term changes. In simple terms, brain entropy describes how varied and flexible brain activity becomes. Greater changes in brain activity were linked to stronger feelings of personal insight, which in turn were linked to better well-being weeks later.