Essentials: The Science of Emotions & Relationships

The episode opens by putting emotions at the centre of lived experience. Behaviours, places and encounters with other people all feed into an emotional judgement of what those things meant: whether they made us happy, sad, depressed, lonely, or filled us with awe. The first caveat comes straight away. Everyone perceives emotion a little differently, so one person's idea of happiness is very likely different from another's.

Colour vision is offered as the analogy. The cells that detect red can be identical between two people, down to the genes they express. Even so, the episode cites experimental and psychophysical evidence that two people shown ten reds would disagree about which one is the most intense. From this the episode concludes that even something as basic-seeming as colour is not universal. It then frames the rest of the discussion around one premise:

we need to agree at the outset that emotions are complicated, and yet they are tractable.

The stated aim is practical. Listeners are meant to understand what their emotional states do and do not mean, judge whether a given emotional state should be held as true or meaningful, and decide whether other people's emotions matter in a particular context. The discussion focuses on two developmental periods, infancy and puberty. It also promises tools for widening emotional range and handling difficult emotional situations.

The host, who introduces himself as Andrew Huberman, a professor of neurobiology and ophthalmology at Stanford School of Medicine, is open about the limits of his expertise. He says, "I am not a clinical psychologist. I'm not a therapist." He describes his method as drawing on major figures in the psychology of emotion and emotional development and linking their work to modern neuroscience of chemicals, hormones and neural circuits. He also says there is no single, universally true theory of emotion. His claim is that a set of "ground truths" sits where many existing theories overlap.

The episode borrows a rule from neuroanatomy. To understand what a brain area does, you need to know two things: what connections it makes, and where it comes from developmentally. Applying that rule to emotion runs into an acknowledged scientific debate. The older idea of dedicated circuits that produce happiness or sadness has been challenged. The episode still holds that there is good evidence for circuits, such as limbic circuits, that shift overall state. These circuits raise or lower alertness and calm, and they tilt attention either toward the outside world or toward what is happening inside the body.

The developmental argument is that emotions arise in the brain and body and are built during infancy, adolescence and puberty. They keep developing into adulthood, but the foundations are laid in early childhood. Two modes of engaging with the world are introduced here, and they recur through the rest of the episode. Interoception is attention to what is happening inside you. Exteroception is attention to what is happening outside you. The episode stresses that both run, to some degree, at the same time throughout life, and it calls this framing absolutely critical for understanding emotions.

According to the episode, infants have no cognitive understanding of what they need. They do not understand hunger, cold or heat. A need is felt as anxiety, a rise in alertness when the baby is hungry or needs to use the bathroom. The baby responds by crying out, vocalising, cooing or acting agitated, and a caregiver responds in turn. The episode notes that all developmental psychologists agree babies cannot make cognitive sense of the outside world. Early on, the world exists for the baby mainly as something that responds to its acts of anxiety.