Thin-slicing is part of what makes the unconscious so dazzling. But it’s also what we find most problematic about rapid cognition. How is it possible to gather the necessary information for a sophisticated judgment in such a short time? The answer is that when our unconscious engages in thin-slicing, what we are doing is an automated, accelerated unconscious version of what Gottman does with his videotapes and equations. Can a marriage really be understood in one sitting? Yes it can, and so can lots of other seemingly complex situations. What Gottman has done is to show us how.

I watched the videotape of Bill and Sue with Amber Tabares, a graduate student in Gottman’s lab who is a trained SPAFF coder. We sat in the same room that Bill and Sue used, watching their interaction on a monitor. The conversation began with Bill. He liked their old dog, he said. He just didn’t like their new dog. He didn’t speak angrily or with any hostility. It seemed like he genuinely just wanted to explain his feelings.

If we listened closely, Tabares pointed out, it was clear that Bill was being very defensive. In the language of SPAFF, he was cross-complaining and engaging in “yes-but” tactics—appearing to agree but then taking it back. Bill was coded as defensive, as it turned out, for forty of the first sixty-six seconds of their conversation. As for Sue, while Bill was talking, on more than one occasion she rolled her eyes very quickly, which is a classic sign of contempt. Bill then began to talk about his objection to the pen where the dog lives. Sue replied by closing her eyes and then assuming a patronizing lecturing voice. Bill went on to say that he didn’t want a fence in the living room. Sue said, “I don’t want to argue about that,” and rolled her eyes—another indication of contempt. “Look at that,” Tabares said. “More contempt. We’ve barely started and we’ve seen him be defensive for almost the whole time, and she has rolled her eyes several times.”

At no time as the conversation continued did either of them show any overt signs of hostility. Only subtle things popped up for a second or two, prompting Tabares to stop the tape and point them out. Some couples, when they fight, fight. But these two were a lot less obvious. Bill complained that the dog cut into their social life, since they always had to come home early for fear of what the dog might do to their apartment. Sue responded that that wasn’t true, arguing, “If she’s going to chew anything, she’s going to do it in the first fifteen minutes that we’re gone.” Bill seemed to agree with that. He nodded lightly and said, “Yeah, I know,” and then added, “I’m not saying it’s rational. I just don’t want to have a dog.”

Tabares pointed at the videotape. “He started out with ‘Yeah, I know.’ But it’s a yes-but. Even though he started to validate her, he went on to say that he didn’t like the dog. He’s really being defensive. I kept thinking, He’s so nice. He’s doing all this validation. But then I realized he was doing the yes-but. It’s easy to be fooled by them.”

Bill went on: “I’m getting way better. You’ve got to admit it. I’m better this week than last week, and the week before and the week before.”

Tabares jumped in again. “In one study, we were watching newlyweds, and what often happened with the couples who ended up in divorce is that when one partner would ask for credit, the other spouse wouldn’t give it. And with the happier couples, the spouse would hear it and say, ‘You’re right.’ That stood out. When you nod and say ‘uh-huh’ or ‘yeah,’ you are doing that as a sign of support, and here she never does it, not once in the entire session, which none of us had realized until we did the coding.

“It’s weird,” she went on. “You don’t get the sense that they are an unhappy couple when they come in. And when they were finished, they were instructed to watch their own discussion, and they thought the whole thing was hilarious. They seem fine, in a way. But I don’t know. They haven’t been married that long. They’re still in the glowy phase. But the fact is that she’s completely inflexible. They are arguing about dogs, but it’s really about how whenever they have a disagreement, she’s completely inflexible. It’s one of those things that could cause a lot of long-term harm. I wonder if they’ll hit the seven-year wall. Is there enough positive emotion there? Because what seems positive isn’t actually positive at all.”

What was Tabares looking for in the couple? On a technical level, she was measuring the amount of positive and negative emotion, because one of Gottman’s findings is that for a marriage to survive, the ratio of positive to negative emotion in a given encounter has to be at least five to one. On a simpler level, though, what Tabares was looking for in that short discussion was a pattern in Bill and Sue’s marriage, because a central argument in Gottman’s work is that all marriages have a distinctive pattern, a kind of marital DNA, that surfaces in any kind of meaningful interaction. This is why Gottman asks couples to tell the story of how they met, because he has found that when a husband and wife recount the most important episode in their relationship, that pattern shows up right away.

“It’s so easy to tell,” Gottman says. “I just looked at this tape yesterday. The woman says, ‘We met at a ski weekend, and he was there with a bunch of his friends, and I kind of liked him and we made a date to be together. But then he drank too much, and he went home and went to sleep, and I was waiting for him for three hours. I woke him up, and I said I don’t appreciate being treated this way. You’re really not a nice person. And he said, yeah, hey, I really had a lot to drink.’” There was a troubling pattern in their first interaction, and the sad truth was that that pattern persisted throughout their relationship. “It’s not that hard,” Gottman went on. “When I first started doing these interviews, I thought maybe we were getting these people on a crappy day. But the prediction levels are just so high, and if you do it again, you get the same pattern over and over again.”

One way to understand what Gottman is saying about marriages is to use the analogy of what people in the world of Morse code call a fist. Morse code is made up of dots and dashes, each of which has its own prescribed length. But no one ever replicates those prescribed lengths perfectly. When operators send a message—particularly using the old manual machines known as the straight key or the bug—they vary the spacing or stretch out the dots and dashes or combine dots and dashes and spaces in a particular rhythm. Morse code is like speech. Everyone has a different voice.

In the Second World War, the British assembled thousands of so-called interceptors—mostly women—whose job it was to tune in every day and night to the radio broadcasts of the various divisions of the German military. The Germans were, of course, broadcasting in code, so—at least in the early part of the war—the British couldn’t understand what was being said. But that didn’t necessarily matter, because before long, just by listening to the cadence of the transmission, the interceptors began to pick up on the individual fists of the German operators, and by doing so, they knew something nearly as important, which was who was doing the sending. “If you listened to the same call signs over a certain period, you would begin to recognize that there were, say, three or four different operators in that unit, working on a shift system, each with his own characteristics,” says Nigel West, a British military historian. “And invariably, quite apart from the text, there would be the preambles, and the illicit exchanges. How are you today? How’s the girlfriend? What’s the weather like in Munich? So you fill out a little card, on which you write down all that kind of information, and pretty soon you have a kind of relationship with that person.”