As many of you will know, I like nature-improves-mind stories. A new twist comes from a small Scottish study, in which participants were fitted up with a mobile EEG monitor that enabled their brainwaves to be recorded as they walked for 25 minutes through one of three different urban settings: an urban shopping street, a path through green space, or a street in a busy commercial district. The monitors measured five ‘channels’ that are claimed to reflect “short-term excitement,” “frustration,” “engagement,” “arousal,” and “meditation level."
Consistent with Attention restoration theory, walkers entering the green zone showed lower frustration, engagement and arousal, and higher meditation, and then showed higher engagement when moving out of it — suggesting that their time in a natural environment had ‘refreshed’ their brain.
 . The urban brain: analysing outdoor physical activity with mobile EEG. British journal of sports medicine. 2013 .