Isn't that covered by the 3rd paragraph, or are you asking about something else? > They found that when spouses were physically together, they showed higher si

Isn't that covered by the 3rd paragraph, or are you asking about something else? > They found that when spouses were physically together, they showed higher similarities in brain responses to the stimuli than when they were separated. This effect was only found in true couples and not in randomly matched study participants.