The Apps You Can’t Close

Stress, the Nervous System, and Executive Performance

What is stress? The machine that never sleeps

Simply put, stress is a biological response to overload. Think of your body as an extraordinarily complex machine — far more sophisticated than anything you own. Your smart washing machine has one input: laundry. Smart as it is, you still have to tell it the temperature. Your phone has a few more inputs — camera, microphone, keyboard, email — but each app mostly runs separately, drawing on the same battery.

eyboard, email — but each app mostly runs separately, drawing on the same battery.
You, by contrast, have dozens of inputs running simultaneously — sensory, emotional, cognitive, relational — all processed at once, all talking to each other, all feeding back constantly. And unlike your phone, you can’t close the apps you don’t need. They run whether you want them to or not.

Your body keeps running the apps.

The job interview — the easy part

Here’s an example. You are a serious contender for a job and they have taken you out to dinner. With your companions you order a nice meal and a glass of wine. Eating and drinking occur through habit — no need to tell your hands to move or your mouth to open. Chewing and swallowing involves more automatic physiological mechanisms, not to mention the events in your stomach and digestive organs. You are looking at, listening, and speaking to your companions. Actually, as far as you are aware, that is where the action is, where your consciousness is focused. You want to make a good impression and you believe you are listening and responding to the content — what the job will require and whether your qualifications are up to snuff.

At the same time, a larger part of your brain is on high alert, processing something even more interesting to your organism. Your eyes, ears, skin, smell are taking in social and emotional cues from your interactions, processing non-verbal and non-cognitive information such as the body language, tone of voice, and the emotions and felt-presence of the people at your dinner table. You sip your wine and feel a buzz. Your brain tells your body to override the buzz and concentrate on saying the right things. As the dinner progresses, you sense there is good rapport between you and your prospective colleagues. Your body relaxes, and now you don’t mind letting your mind slow down a bit.

So far, so good. No stress.

The job interview — the hard part

Then a latecomer joins the dinner table, someone key to your hiring, like the department head. Everyone, including you, becomes subtly more alert and tense. At some point, she asks you a pointed question about your last job, the true answer to which is “it’s complicated.” You know that response won’t cut it, and you fumble your answer. It is complicated and you haven’t yet found a way to talk your way through this in previous interviews. You are aware that your stumbling answer is not giving the impression you want. At the same time your face heats up, your voice may quaver, and you are working hard to maintain eye contact without looking embarrassed. All these apps are running simultaneously. The overload is the stress.

What the body is doing

The body’s stress response — the surge of cortisol and adrenaline, the narrowing of attention, the heightened vigilance — is not a malfunction. It is the organism doing exactly what it was designed to do: mobilize resources in the face of threat. The problem for the modern leader is that this system evolved for acute physical danger, not for sustained organizational pressure. The tiger is gone. The quarterly review is not. And unlike the tiger, the quarterly review doesn’t end.

When the stress response is chronically activated, it accumulates. Sleep degrades. Cognitive flexibility narrows. The capacity for nuance — for holding complexity, for reading the room, for tolerating uncertainty — shrinks. A leader under sustained stress is not simply a stressed leader. They are a neurologically different leader — one whose system is prioritizing survival over insight.

What the research shows

The neuroscience here is robust. Chronic stress shrinks the prefrontal cortex — the part of the brain responsible for judgment, planning, and impulse regulation — while enlarging the amygdala, the threat-detection center. The leader who has been under sustained pressure for months is, in a measurable sense, less well-equipped for the work that leadership actually requires.

This is not a character failing. It is a physiological reality. And it responds to physiological intervention: sleep, movement, recovery time, and — critically — the experience of genuine safety in at least one relationship. Not managed safety, but actual safety. The kind that comes from being genuinely accompanied rather than strategically supported.

What actually helps

The interventions that help are not primarily cognitive. A leader cannot think their way out of a chronically activated stress response. They can, however, regulate it — through the body, through relationships, through the nervous system itself.

Somatic awareness — the capacity to notice and name what is happening in the body — turns out to be one of the most effective regulatory tools available. Naming the emotion, as the neuroscience shows, activates the prefrontal cortex and dampens the amygdala response. The brain craves clarity. When you give it a name for what you’re feeling, it can begin to process rather than react.

This is what coaching at depth can offer that advice and strategy cannot: a relationship in which the interior experience has somewhere to land. Not to be analyzed away, but to be known. And in being known, to begin to regulate.

See also: When Optimism Filters Out Feedback (Vijay) — the case illustration for this cluster.