Close relationships help us shape both our other social interactions as well as our internal physiology. Do these close relationships, also known as pair bonds, look and function similarly in species as diverse as titi monkeys, prairie voles, seahorses, and humans? How do negative experiences such as loss factor into, and perhaps strengthen, our close relationships? And what do we mean by luminance? This lecture will explore these topics while also touching on the underlying neurobiology of pair bonding. Recorded on 02/14/2025. (#40380)