1. Arousal regulation: The way a human mind and body respond to and manage moods and emotions, both their own and their partner’s.

2. Attachment theory: Helps to explain how people come to form and nurture their attachment with significant people in their lives.

3. Developmental neuroscience: How the brain changes over time in response to both environmental and biological inputs and the impact these changes have on relationship behaviour, from infancy to adulthood.