Science of Social Bonding in Family, Friendship & Romantic Love

The episode is introduced as a discussion of the biology, psychology and practices of social bonding. The speaker identifies himself as Andrew Huberman, a professor of neurobiology and ophthalmology at Stanford School of Medicine. The opening argument is broad: the quality of social bonds is said to dictate much of quality of life from birth until death, so the brain, and much of the nervous system, should be expected to be wired for them.

The introduction lists the bonds it will cover: infant and mother, infant and father, friendship, and romantic relationships. It also covers how bonds end, including breakups in either direction, a death, someone moving away, or a person otherwise leaving one's life. The plan is to describe the circuits involved and the neurochemicals and hormones behind them, and to offer tools for interactions with family and friends over the New Year's and Christmas holidays. It also promises to address people who are not spending that time with family, partners or friends.

Several later topics are previewed: whether introversion and extroversion may have a neurochemical basis, a gene or set of genes said to predict whether someone follows more people or seeks more online social interaction, and why breakups of romantic partners, friends and coworkers can be so painful. The genetic work is described as "excellent peer-reviewed work", but this part of the episode does not present the study itself. The episode also states that the podcast is separate from the speaker's teaching and research roles at Stanford.

The word "bonding" is chosen on purpose because it is a verb. The framing is that "everything in biology is a process, it's not an event," which means it has multiple steps. The episode says it will follow those steps in order: how bonds are established, maintained, broken and reestablished.

They are generic.

The main structural claim is that the neural circuits, hormones such as oxytocin, and other chemicals behind social bonding are not unique to particular kinds of bonds. The same circuits that build the parent–child bond are said to be repurposed in romantic relationships. The episode connects this to the familiar categories of secure, anxious and avoidant attachment, which it says have roots in whether children and parents formed healthy or challenged bonds. It says it will only touch on attachment styles briefly.

This comes with an important limit on determinism. The episode cites the scientific and psychological literature as clear that a poor or even terrible early bond with a parent or caretaker "doesn't fate you" to poor bonds as an adult. It describes the system as plastic, able to rewire in response to experience. It also says specific parts of the bonding circuitry let people place subjective labels on why they act as they do and rewire those circuits.

The summary claim is that there are not "12 different circuits" for different social bonds but one circuit with universal features. The roadmap moves from those circuits to how they plug into different relationships, then to introversion and extroversion, trauma bonds and healthy bonds. It also promises "a unique chemical signature of all bonding of all kinds" and ways to modulate it.

Before bonding itself, the episode turns to its opposite, social isolation, which it says has a large literature on the harms that follow when animals or humans are isolated at particular phases of life. It separates this from introversion. Choosing to spend less time with others is not described as necessarily damaging. The speaker describes himself as an introvert who enjoys one or two close friends and a lot of time alone, though not an extreme one. Isolation is defined narrowly as being restricted from the social contact one would prefer to have.

The main takeaways are presented as coming from a literature that goes back a hundred years or more. Isolation is stressful, and a hallmark feature is chronically elevated stress hormones such as adrenaline (epinephrine) and cortisol. The episode adds that cortisol at healthy levels is good for combating inflammation and helps with energy early in the day and focus through the day. The problem is cortisol that stays elevated too long, which it says follows from isolation: the immune system suffers, and other chemicals are released that are designed to push the organism toward social bonds.

The example given is the peptide tachykinin, described as present in flies, mice and humans, with levels that rise under social isolation. Because of the brain areas that contain its receptors, people are said to become aggressive and irritable after isolation. The episode notes this is counterintuitive: one might expect an isolated person offered social contact to be thrilled to finally get the "social nourishment" they lacked. Instead, chronic isolation is said to change the brain and body in ways that make connection harder and can make the isolated person irritable or even aggressive with others.

The episode then sets limits on this topic. It does not go deeply into the pathology of isolation, arguing that isolation biology offers little insight into what healthy bonding looks like. It says isolation starts to degrade aspects of brain and body fairly quickly, but how quickly depends on how introverted or extroverted someone is. For a person isolated over the holidays who is craving contact, the craving is described as healthy and as having its own circuit and neurochemical signature.

The central scientific source in this section is the laboratory of Kay Tye, described as a professor at the Salk Institute for Biological Studies and an investigator with the Howard Hughes Medical Institute. Over roughly the last five or six years, the episode says, her lab made a fundamental discovery about why people put so much effort into social bonds. Much like hunger, temperature and thirst, there are brain circuits devoted to "social homeostasis."

Homeostasis is explained as the tendency of circuits, cells, tissues and organisms to maintain a certain level and regulate themselves. Hunger is the main analogy. After going without food, the drive to think about, make, pay for and enjoy food rises, and when well fed, a person pursues it with less intensity. A home thermostat is offered as a "crude" model that senses when a room drifts from a set temperature and switches heating or cooling on.

The episode describes at least three components of any homeostatic circuit, applied here to social life: - A detector, which registers whether you are interacting with others and whether those interactions are going well. - A control center, which adjusts behavior and psychology. For example, more time alone increases the motivation to seek out pictures of faces, real interactions and physical contact, while someone already sated may not seek bonds as hard. - An effector, which drives the actual behavior: picking up social media and scrolling, texting or calling a friend, making plans and following through on them.

The episode admits the behavioral pattern may seem obvious. What it treats as notable, crediting Kay Tye and others, is that specific brain centers make these adjustments. It also says the social circuit has a fourth component that "places subjective understanding as to why you are doing what you are doing and establishes your place in a hierarchy."

The episode expects resistance to the word "hierarchy," which it calls "a little bit of a barbed wire one" because it suggests boss and subordinate, or leader and follower in a couple. Its argument is that human social hierarchies are very plastic. One person leads in one setting and another person leads in a different setting. Among friends or family, the baton passes constantly: who drives, who navigates, who picks the restaurant, who clears the dishes.