What Communication Costs and Earns You

Happy Friday, and congratulations on conquering another week. Here is your reminder that as machines get better at nearly everything, the one thing that stays irreplaceable is human excellence itself. That is human prowess. We are striving for it, and you're reading this because you're striving for it too. Let's get into it.

In Letter One, we asked how you would communicate now that artificial intelligence and a decade of digital habits have quietly lowered the bar for what passes as real interaction. Two weeks ago, Letter Two went to the neuroscience for an answer: brain coupling, mirror neurons, and a body of science that left the diagnosis still open. This letter closes that diagnosis and asks a harder question, the one that sets up where we are headed next. What does communication actually cost you when you get it wrong, and what does it earn you when you get it right?

The brain knows the difference between a screen and a room, and it knows it before you have consciously registered a thing. Researchers at Yale, led by neuroscientist Joy Hirsch, used two person brain imaging, tracking eye movement, pupil size, and neural activity in real time, to compare live conversation against conversation over Zoom. The takeaway was simple. Online representations of a face do not have the same privileged access to the brain's social circuitry that a real one does. You reading this already know this, but now you have something better than a hunch. You have a mechanism. When a conversation clicks in person and stalls on a call, that is not a mood or a preference. It is a measurably different neurological event, and it explains why some people who live almost entirely through a phone find raw human contact almost unbearable at first. That is atrophy, not a character flaw, and it can be trained back.

Lately I have been doing a lot of mentoring through Peer Transfer, a consulting business I started my sophomore year of college that has since turned into a kind of life coaching for peers who have come to trust my read on things. What I keep seeing is the same problem. So many of them struggle with social presence, because the developmental windows for building it were taken by Covid. A cohort raised on screens grew up without ever learning how to sit across from another person and simply interact. Take this as a reminder of just how important social skills are in this life we lead.

Back on track: Presence is not the whole story, though, and I would be less honest if I stopped there. Michael Kraus at Yale ran five experiments and found that voice only communication produced higher accuracy at reading another person's true emotional state than either video or face to face conversation did. The reason is that a face is also a channel people use to hide how they feel, so removing it forces the listener's attention onto tone, pace, and pitch, which is where the more honest signal lives. Presence builds the bond. Voice reads the emotion. Text does neither particularly well. Knowing which job you are actually doing in a given conversation, bonding or understanding, tells you which channel to reach for.

Trust is partly chemical, and the chemical in question is oxytocin, produced in the hypothalamus and released through eye contact and touch. It plays a documented role in bonding, attachment, and fear regulation. One detail is worth sitting with. Oxytocin is bounded to the people already familiar to you. It deepens trust within a group while raising vigilance toward outsiders, which is why repeated contact with the same person compounds in a way scattered contact with many different people never does.

Chemistry alone will not carry a relationship. The behavioral lever sitting on top of it is listening, and the data here is about as stark as leadership research gets. Zenger Folkman's leadership studies found leaders rated as poor listeners sitting at the 15th percentile of trust, while leaders who excelled at listening reached the 86th percentile. Active listening was not born in a boardroom. It was built for therapy in 1951, and it has since migrated into marriage counseling and then the workplace. The technique was designed to build trust between two people at their most vulnerable, and it works the same way now. As Stephen Covey put it, "When the trust account is high, communication is easy, instant, and effective."

Communication compounds like interest, and this has never been clearer than in a single negotiation. Researchers at George Mason University and Temple University surveyed 149 recently hired professionals and found that those who effectively negotiated their starting salary, rather than accepting the first offer, raised their pay by an average of roughly $5,000. Carried forward across a career, the researchers found that gap could exceed $634,198 over forty years. One conversation, one number spoken out loud, and the difference compounds for decades. This is not new to you, but it should serve as a reminder of just how powerful effective communication is.

Your body keeps the score on how communication costs and earns you, whether you are paying attention or not. The Harvard Study of Adult Development, the longest running study of human happiness in existence, has tracked participants for over eighty years, and it found that the quality of a person's relationships predicted physical health at fifty better than their cholesterol did. Strong relationships appear to act as stress regulators. They help the body return to baseline, and people with robust social connection show lower rates of diabetes, arthritis, and cognitive decline. One detail stays with me when a conversation gets hard. The study's healthiest older couples were not the ones who avoided conflict. It was felt security, not the absence of friction, that protected them.

The cost side is just as real. Chronic loneliness is often benchmarked against smoking around 15 cigarettes a day, and is associated with meaningfully higher risk of premature death, heart disease, and stroke. Relationships are fundamentally bound by communication, and the underlying toll of loneliness on the body is real and well documented. How you cultivate trust and navigate your relationships through communication ultimately shapes your health and how long you will live.

Avoidance carries its own cost. Suppressing a conversation that needs to happen produces a measurable physiological toll. Cortisol rises, sleep breaks down, and the stress hormones you generate impair the prefrontal cortex, the exact brain region responsible for language and emotional regulation. So the longer you shy away from a hard conversation, carrying the elevated stress and the strained relationship, the worse equipped you become to actually have it. Waiting does not make the conversation easier. It makes you worse at it.

Put all of this together and one line runs through it. Every advantage in this letter, the neural, the chemical, the financial, the physical, comes from choosing your channel and your attention on purpose instead of by default. That will never be a skill artificial intelligence is coming for, because it is your own deliberate decision about how you communicate, and with whom, that raises the quality of your life. It is the opposite of what a machine does.

This letter moves person to person, by referral, which is exactly how it should grow. So if someone came to mind while you were reading, the kind of person who would value this the way you do, send it their way. Some things are better passed hand to hand.

See you in two weeks, Jaron

Zhao, N., Zhang, X., Noah, J. A., Tiede, M., and Hirsch, J. (2023). Separable processes for live in person and live zoom like faces. Imaging Neuroscience, 1, imag_a_00027.

Kraus, M. W. (2017). Voice only communication enhances empathic accuracy. American Psychologist, 72(7), page 644 to 654.

Marks, M., and Harold, C. (2009). Who asks and who receives in salary negotiation. Journal of Organizational Behavior.

Zenger, J., and Folkman, J. Leadership research on listening and trust, cited in Forbes, 2025.

Covey, S. R. (1989). The 7 Habits of Highly Effective People.

Waldinger, R. The Harvard Study of Adult Development, cited in Harvard Gazette, 2017.

Holt Lunstad, J., Smith, T. B., Baker, M., Harris, T., and Stephenson, D. (2015). Loneliness and social isolation as risk factors for mortality. Perspectives on Psychological Science.