I am sixty-one years old and I have run a small clinical audiology practice out of a second-floor office on upper Congress Street in Portland, Maine for the last twenty-two years, after eight years at a larger group on outer Forest Avenue and two years before that in a hospital audiology department in Bangor. The people who come to see me are mostly in their sixties, seventies, and eighties, with a slow but steady trickle of construction workers and commercial fishermen in their forties whose ears have already given more than most ears give in a lifetime. My days are built around a shape I could probably draw on a napkin. Case history at the front, pure-tone audiometry in the sound-treated booth, speech testing at two loudness levels, tympanometry when the middle ear needs a look, real-ear measurement at the fitting, and a follow-up in two weeks with the small paper printout of settings I hand across the desk so a patient can compare what their morning sounded like at the follow-up to what their morning sounded like the day I first sent them home with a device in each ear.

The shape works because a hearing test is a very structured conversation. I ask a patient about their kitchen, their car, their grandchildren on speakerphone, the particular table at the particular diner where they can no longer follow what their oldest friend is saying, and I get answers that fit into the boxes on the intake form I have been printing on the same beige card stock since about 2006. Then we go into the booth and the answers become numbers, and the numbers become a plot, and the plot becomes a set of gain targets for the fitting software, and the fitting software becomes a device behind an ear. The whole day is a chain of small structured exchanges, one after another, from eight in the morning until the last real-ear check at four forty-five in the afternoon. I have run some version of this chain, by my own count, on close to twelve thousand fittings and follow-ups over thirty years, and I could run it on a Wednesday afternoon in February with a head cold and a broken heater and a waiting-room fish tank that had just sprung a leak, which more or less describes a Wednesday last winter.

The thing that I could not have predicted was what would happen the week I finally started wearing a pair of over-the-counter hearing aids myself. My own audiogram had, quietly, slid into the mild-to-moderate range across the higher frequencies over about five years, which is a slide I have watched a thousand patients try to ignore and which I had been ignoring in exactly the ways I gently caution them not to. I sat in my own booth on a Thursday morning after the last cancellation of the week, ran a test on myself with a colleague reading the tone thresholds off the monitor, and put on a pair of self-fitting devices from a brand I stock on the shelf in my own waiting room. What I had assumed, on the strength of thirty years of watching this go one particular way for other people, was that hearing better would translate almost immediately into a slightly easier evening at home. My sister, whose name is Iris and who lives about an hour south in Kittery in an apartment above a bakery on Government Street, would call me on my Thursday drive home, and I would hear her better, and I would say more back, and that would be the end of that particular chapter.

What happened instead was that I could hear Iris cleanly for the first time in about three years, and I could not think of a single sentence to say back to her. The forty-minute drive down Route 1 went by in near silence on my end. I could hear the tick of her ring against her mug, the small breath she took before she changed subject, the fact that she was walking around her kitchen while we talked and pausing at the window each time a truck went past the bakery downstairs, and none of the ordinary follow-up sentences I would have said back to her before my hearing had started to slide came out of my mouth. I hung up at the exit for my street and sat in the driveway with the engine still on and worked out, without particular relief, that hearing had not been the only thing that had gone thin. Some part of me that used to answer Iris on a drive home had also gone thin, quietly, and had gone thin under the cover of the hearing loss, so I had not had to look at it directly for something like five years.

Ellen, a speech-language pathologist I used to share a graduate school study carrel with at the University of Southern Maine and who now drives down twice a month from Falmouth to run a small aphasia group in a church basement two blocks from my office, is the person who put a name on it for me. We were at our usual after-work coffee on a Wednesday in early spring, and I told her, in a slightly shorter and much more embarrassed version than I am giving here, about the drive home from work with Iris. She said she had seen a version of this in the older speech patients she worked with for years, and increasingly in herself since her own hearing had started to slip in her mid-fifties. The muscle for a structured exchange, she said, is not the same muscle as the one for an unstructured exchange, and when a person spends thirty working years running the structured muscle for eight hours a day, the unstructured muscle can quietly go slack without anybody in the household noticing until the person tries to use it and cannot. She mentioned, almost as an afterthought, that she had recently started using an online conversation platform for about twenty minutes on the evenings when her own unstructured muscle felt particularly stiff, mostly because it gave her a low-pressure place to practice the specific reflex of answering somebody about nothing in particular without an intake form in front of her. She was careful to say that it was not a substitute for therapy, medical treatment, or professional mental health support, and that if anything she was describing sounded larger than a stiff conversational muscle she would say so plainly.

The general shape of what Ellen was describing is not, on reflection, unique to audiologists or to older women in coastal Maine. The U.S. Surgeon General's advisory on loneliness and social isolation, which came out a couple of years ago and which I keep a paper copy of on the shelf between two clinical texts I have not opened since about 2015, makes the point in more careful language that many adults reach middle age with plenty of company on paper and very little in the way of small, unstructured, no-agenda conversation in a given week. That gap does not show up on an audiogram. It does not show up on a fitting printout. It shows up, if it shows up at all, on a Thursday evening drive home from work, when the hearing has just come back and the reflex for answering a sister has not.

The first person I matched with, on a Tuesday evening about ten days after Ellen mentioned it, was a night-shift postal worker in Bergen, Norway who had just come off a route through a residential neighborhood above the harbor and wanted to walk me through why the delivery order on his particular route had been rewritten twice in the past year to account for the way the ice forms on one specific set of stone steps behind a small cluster of wooden houses on Fjellveien. I did not have a preexisting opinion on Bergen postal routes. What I discovered was that I could still ask good follow-up questions almost without meaning to, because asking good follow-up questions had once been the ordinary substance of a hallway conversation with a colleague between two morning appointments, before the hallway conversations had shortened and shortened over the years and finally, without my noticing, mostly disappeared. He talked for about twenty minutes, then his shift ended and he was gone. I put my phone face down on the kitchen counter and noticed that I had just held up my end of a conversation without any shape to it for the first time, as far as I could tell, in most of a year.

I have kept at it in the small awkward way you keep at anything that starts giving you back something you had not been looking for. On a slow Sunday afternoon in April I ended up in a long exchange with a florist in Sapporo who wanted to walk me through, greenhouse by greenhouse, why the temperature swing in a snow-buried cold frame at the edge of her neighborhood produced tulips with a specific bend in the stem that her regular Wednesday customer would only accept from her particular shop. The following Thursday I matched with a fish seller at the Marché des Capucins in Marseille who wanted to explain, at some length, why the traditional list of fish for a proper bouillabaisse had drifted three times in the last forty years because of what was and was not landing at the quay in a given season, and why he thought the drift was, in the long run, a more honest history of the dish than any cookbook was likely to tell. Late one Sunday night in early May, after the practice had closed for the weekend and I could not sleep, a watchmaker in Prague talked me through why the chronograph movements coming out of a specific workshop in the years just before the war had a particular kind of hand-finished bridge that a trained eye could still recognize on a bench today, if you knew where the file marks were supposed to fall. None of them knew I was an audiologist. Two of them told me things I have not been able to repeat to anybody, because I have no way of finding them again, which turned out to be a piece of the arrangement I could not have anticipated when Ellen first mentioned it.

Knotchat pairs a person with one other person at a time, in an exchange the two of them can keep to text or open up to video if they both want to, and that plain shape is the reason it has been useful to me in a specific narrow way. I would not describe it, to a patient in my own booth or to a colleague at the state audiology meeting in October, as anything like a stand-in for the slow work of knowing the same people over years. What it has been, honestly, is a place to keep an ordinary conversational reflex from wasting further while I spend my working hours in the most highly structured version of the same reflex. I use it maybe twice a week, in the evening, for about twenty minutes at a time, and most of the exchanges are forgettable in a way I have come to appreciate, and the forgettable part is close to the whole point.

Iris and I met at a small bakery on Government Street in Kittery, at a corner table by the front window, on a Saturday morning about seven months after the drive home in silence. She had a coffee and I had a tea, and the little bell over the door went off every couple of minutes as somebody came in for a loaf of sourdough. She asked me how the practice had been that week. I told her that a woman in her late seventies had come in on the Wednesday with a very specific complaint about only being able to follow her middle grandson on the phone if he called from his mother's kitchen and not from his own, and that I had spent most of the fitting appointment trying to figure out whether the difference was the microphone on the phone in the mother's kitchen, the wall behind the boy's head in his own apartment, or the boy's willingness to sit still and face the phone in one house and not in the other. Iris asked me two follow-up questions, both of them the kind of questions somebody who has been listening asks. We ended up talking about the woman and her grandson for close to forty minutes, and about our own week for another twenty, and near the end of the second cup Iris said, without quite looking up from her plate, that I had answered her this time. I said I had noticed. She laughed, and asked the woman behind the counter whether we were still allowed to order a second pastry this late in the morning, and we sat there until it was almost lunch.